RT9458 Datasheet by Richtek USA Inc.

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RT9458
®
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Copyright 2017 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation.
Switch-Mode Single Cell Li-Ion Battery Charger
with USB-OTG
General Description
The RT9458 is a switch-mode single cell Li-Ion/Li-Polymer
battery charger for portable applications. It integrates a
synchronous PWM controller, power MOSFETs, input
current sensing, high accuracy voltage regulation and
charge termination circuits. The RT9458 also features USB
On-The-Go (OTG).
The RT9458 optimizes the charging task by using a control
algorithm to vary the charge rate via different modes,
including pre-charge mode, fast charge mode, and constant
voltage mode. The key charge parameters can be
programmed via the I2C interface. The RT9458 resumes
the charge cycle whenever the battery voltage falls below
an internal threshold and automatically enters sleep mode
when the input power supply is removed.
Other features include under-voltage protection, over-
voltage protection, thermal regulation and reverse leakage
protection.
The RT9458 is available in the small WL-CSP-20B
2.1x1.87 (BSC) package.
Applications
Cellular Telephones
Personal Information Appliances
MP3 Players
Portable Instruments
Simplified Application Circuit
Features
Support Quick Start for Charger
High Accuracy Voltage/Current Regulation
Input Current Regulation : 100mA/500mA/700mA/
1A
Minimum Input Voltage Regulation : 4.1V to 4.7V
Per 0.1V Step
Charge Voltage Regulation Accuracy : ±±
±±
±1% (0 to
85°°
°°
°C)
Charge Current Regulation Accuracy : ±±
±±
±5%
Built-In Input Current Sensing and Limiting
Integrated Power MOSFETS for up to 1.55A Charge
Rate
Integrated Sensing Resistors for Charging Current
Sensing
Synchronous 1.5MHz Fixed Frequency PWM
Controller with up to 95% Duty Cycle
Reverse Leakage Protection to Prevent Battery
Drainage
Thermal Regulation and Protection
Over-Temperature Protection
Input Over-Voltage Protection
IRQ Output for Communication with I2C
Automatic Charging
RoHS Compliant and Halogen Free
Marking Information
BATS
LX
GND
OTG
RT9458
VINTo Adaptor/USB
+
ISNSIN
VMID
SCL
SDA
IRQ
Battery
4EW
4E : Product Code
W : Date Code
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Functional Pin Description
Pin No. Pin Name Pin Function
A1, A2, A3 VIN Power input.
A4 IRQ IRQ output node. Open-drain output, connect a 10k pull up resistor.
A5 BATS Feedback voltage input for battery.
B1, B2, B3 VMID Connection point between reverse blocking MOSFET and high-side MOSFET.
B4 OTG Boost mode control input or current regulation setting for average input
current.
B5 ISNSIN Charge current sense input.
C1, C2, C3 LX Switch node.
C4 AGND Analog ground.
C5 SCL Clock input for I2C. Open-drain output, connect a 10k pull-up resistor.
D1, D2, D3 PGND Power ground for switching charger.
D4 BOOT
Bootstrap supply for high-side MOSFET. Connect a capacitor between BOOT
and LX.
D5 SDA Data input for I2C. Open-drain output, connect a 10k pull-up resistor.
Ordering Information
Note :
Richtek products are :
RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
Suitable for use in SnPb or Pb-free soldering processes.
Pin Configuration
(TOP VIEW)
WL-CSP-20B 2.1x1.87 (BSC)
RT9458 Package Type
WSC : WL-CSP-20B 2.1x1.87 (BSC)
IRQVINVIN VIN BATS
VMID OTG ISNSIN
VMID VMID
SCLLXLX AGND
PGND SDA
PGND BOOTPGND
LX
A3 A4 A5A1 A2
B3 B4 B5B1 B2
C3 C5C4C1 C2
D3 D4 D5D1 D2
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Functional Block Diagram
Operation
The RT9458 is a switch mode charger with USB-OTG
support for single cell Li-Ion battery in portable applications.
Base Circuits
Base circuits provide the internal power, VDD and reference
voltage and bias current.
Current Sense
Current sense circuit regulates the output current up to
1.5A to battery
Protection Circuits
The protection block includes the OVP, UVLO, OTP, Timer
and other circuits. It turns off the charging when the charger
IC or input power is in abnormal level.
Loop Controller and PWM and Driver
The multi-loop controller controls the PWM signal during
the charging process. The PWM circuit controls the power
stage through the driver. It makes sure that the battery is
well-charged with suitable current, voltage and die-
temperature.
I2C Interface
The I2C interface is used to program the charging
parameters, ex : output current and output voltage.
State Machine
The State Machine controls the operation of the switching
charger and outputs the interrupt via the IRQ pin if there is
any fault be triggered.
Base
VDD, Ibias,
VREF, OSC
Protection
OVP, UVLO,
OTP, Timer
PGND
AGND
VIN
SCL
LX
Gate
Driver 1
BOOT
Gate
Driver 2
VMID
SDA State
Machine
I2C
IRQ
OTG
BATS
Current
Sense
Loop
Control
ISNSIN
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Flow Charts
POR Reset
VIN > 2.4V and
VBATS > 2.4V ? VIN > 3.3V ? Charge Configure
(I2C is Programmable)
Clean I2C
Power On
Any State If VIN < 2.4V and
VBATS < 2.4V
Yes Yes
No
No
Reset Timer
---------------------
T32min mode Any I2C? 32 min?
Any state VIN ,VBATS < 2.4V
Timer Fault
-----------------------
Disable Charging
Any I2C?
Charge Start TMR_EN = 1?
No
Yes
No
Yes
Yes
No
No Yes
No
Yes
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Charger Flow
Power on
PreCharge Mode
Load I2C with default
settings
VBATS > VPREC?
disable charge
-----------------
Charge Configure Mode Any state
Fast-Charge to CV mode
TE is enabled?
ICHRG < IEOC?
32 min timer fault?
BATD_EN is enabled?
Charge done
VBATS < VREC ? Battery Detection Mode
(Detect every 2s)
Sink 0.5mA from battery
----------------------------------
Start 262ms timer
VBATS < VREC?
262ms timer expired?
Yes
No
No
Yes
No
No
Yes
Yes
No
No
Yes
No
Yes
Yes
Yes
No
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OTG Flow
Battery power on
OTG_EN = 1?
OTG_PL = 1?
OTG pin from low to high? OTG pin from high to low?
OTG pin keeps high? OTG pin keeps low?
Any fault except Over
Load ?
OTG Mode
Over Load ?
Any fault except Over
Load ?
OTG Mode
Over Load ?
OPA_MODE = 1 and
HZ = 0?
OTG Mode
Any fault except Over
Load ?
Over Load ?
Set to HZ mode
OTG Configure Mode
OTG Configure Mode OTG Configure Mode
Yes
Yes
Yes
Yes
No
Yes
No
No
No
No
Yes
Yes
Yes
Yes
No
No
No
No
No
Yes
Yes
Yes
No
No
Yes
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Electrical Characteristics
Absolute Maximum Ratings (Note 1)
Supply Input Voltage, VIN ----------------------------------------------------------------------------------------------- 0.3V to 20V
VMID, BOOT --------------------------------------------------------------------------------------------------------------- 0.3V to 20V
LX----------------------------------------------------------------------------------------------------------------------------- 0.3V to 10V
MID VIN, BOOT LX -------------------------------------------------------------------------------------------------- 0.3V to 6V
Other Pins ------------------------------------------------------------------------------------------------------------------ 0.3V to 6V
Power Dissipation, PD @ TA = 25°C
WL-CSP-20B 2.1x1.87 (BSC) ----------------------------------------------------------------------------------------- 2.45W
Package Thermal Resistance (Note 2)
WL-CSP-20B 2.1x1.87 (BSC), θJA ------------------------------------------------------------------------------------ 40.8°C/W
Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------------ 260°C
Junction Temperature ---------------------------------------------------------------------------------------------------- 150°C
Storage Temperature Range -------------------------------------------------------------------------------------------- 65°C to 150°C
ESD Susceptibility (Note 3)
HBM (Human Body Model) --------------------------------------------------------------------------------------------- 2kV
Recommended Operating Conditions (Note 4)
Supply Input Voltage, VIN ----------------------------------------------------------------------------------------------- 4.3V to 6V
Junction Temperature Range ------------------------------------------------------------------------------------------- 40°C to 125°C
Ambient Temperature Range ------------------------------------------------------------------------------------------- 40°C to 85°C
(VIN = 5V, VBAT = 4.2V, L = 1μH, CIN = 0.47μF, CBATS = 10μF, TA = 25°C, unless otherwise specified)
Parameter Symbol Test Conditions Min Typ Max Unit
Protection
VIN OVP Threshold Voltage VINOVP V
IN rising 6.4 6.7 7 V
VIN OVP Hysteresis VINOVP_Hys -- 150 -- mV
Battery OVP VBATOVP (Battery OVP VOREG) / VOREG 110 117 124 %
Battery OVP Hysteresis VBATOVP_Hys -- 10 -- %
Over-Temperature Protection OTP -- 165 -- °C
OTP Hysteresis TOTP_Hys -- 10 -- °C
Thermal Regulation Threshold Charge current begins to reduce -- 120 -- °C
Sleep Mode Comparator
Sleep-Mode Entry Threshold
VIN VBATS VSLP 2.5V < VBATS < VOREG, VIN falling 0 0.04 0.1 V
Sleep-Mode Exit Hysteresis
VIN VBATS VSLPEXIT 2.5V < VBATS < VOREG, VIN rising 40 100 200 mV
Sleep-Mode Deglitch Time tSLP V
IN rising above VSLP + VSLPEXIT -- 128 -- ms
Under-Voltage Lockout Threshold
IC Active Threshold Voltage VUVLO V
IN rising 3.05 3.3 3.55 V
IC Active Hysteresis VUVLO V
IN falling from UVLO -- 150 -- mV
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Parameter Symbol Test Conditions Min Typ Max Unit
Input Currents
VIN Supply Current IQ
PWM switching, ICHRG = IBAT = 0mA -- 10 -- mA
PWM is not switching.
ICHRG = IBAT = 0mA -- -- 5 mA
High impendence mode -- -- 150 A
Leakage Current from Battery IBAT V
BATS = 4.2V, VIN = 0V, charger off -- -- 15 A
Leakage from Battery to
VBUS IBAT_LEK HZ mode = 1, VBAT = 4.2V -- 0.2 5 A
Input Power Regulation
Minimum Input Voltage
Regulation VMIVR I2C programmable per 0.1V 4.1 -- 4.7 V
VMIVR Accuracy VMIVR_ACC 3 -- 3 %
Average Input Current
Regulation Accuracy IAICR USB charge mode, IAICR = 100mA 80 90 100 mA
USB charge mode, IAICR = 500mA 440 470 500
Battery Voltage Regulation
Battery Voltage Regulation VOREG I2C programmable per 20mV 3.5 -- 4.44 V
VOREG Accuracy VOREG_ACC 0 to 85°C 1 -- 1 %
Initial CV Voltage when VBUS
Plug in Before tON_SET VCV_INI V
IN = 5V, without connect battery --4.35 -- V
Deglitch Time when CV is
Determined by I2C Setting
After VBUS Plug in tON_SET V
IN = 5V, without connect battery --1 -- s
Re-Charge Threshold VREC V
BATS falling, below VOREG 80 150 200 mV
Re-Charge Deglitch tREC -- 128 -- ms
Charging Current Regulation
Output Charging Current ICHRG I2C programmable per 0.15A 0.5 -- 1.55 A
ICHRG Accuracy ICHRG_ACC1 500mA to 800Ma, no AICR limit 7 -- 7 %
ICHRG_ACC2 800mA to 1.55A, no AICR limit 5 -- 5
Pre-Charge Threshold VPREC I2C programmable per 0.2V 2 -- 3 V
VPREC Accuracy VPREC_ACC 5 -- 5 %
Pre-Charge Current IPREC I2C programmable per 20mA 20 -- 60 mA
IPREC Accuracy IPREC_ACC 50 -- 50 %
Charge Termination Detection
End of Charge Current IEOC I2C programmable per 50mA 50 -- 400 mA
Deglitch Time for EOC tEOC I
CHRG < IEOC, VBATS > VREC -- 32 -- s
End of Charge Current
Accuracy
IEOC_ACC1 IEOC_= 50mA to 100mA
(RSENSE = 56m) 15 -- 15
%
IEOC_ACC2 IEOC_= 100mA to 250mA
(RSENSE = 56m) 10 -- 10
IEOC_ACC3 IEOC_= 250mA to 400mA
(RSENSE = 56m) 5.5 -- 5.5
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Parameter Symbol Test Conditions Min Typ Max Unit
PWM
Internal MOSFET
On-Resistance RDS From VIN to LX, as IAICR[1:0] = 11 -- 185 240 m
Internal MOSFET
On-Resistance From LX to PGND -- 90 120 m
Charging Efficiency VIN = 5V, VBATS = 4V, and ICHRG = 1A -- 90 -- %
Oscillator Frequency OSC -- 1.5 -- MHz
Frequency Accuracy 10 -- 10 %
Maximum Duty Cycle At minimum voltage input -- 95 -- %
Minimum Duty Cycle 0 -- -- %
Peak OCP as Charger Mode ICHRGOCP 2 2.9 3.8 A
Boost Mode Operation
Output Voltage Level VOTG To VMID, I2C programmable per
25mV 4.425 -- 5.6 V
Output Voltage Accuracy VOTG_ACC 3 -- 3 %
Efficiency
VIN = 5V, VBATS = 4V,
and IIN = 0.4A -- 92.5 -- %
MAX Output Current VBATS = 3.7V, VIN = 5V 1 -- -- A
Peak Over Current Protection VBATS = 3.7V 2.75 4 5.25 A
VIN OVP as OTG Boost 5.85 6.05 6.25 V
VIN OVP Hysteresis -- 200 -- mV
Minimum Battery Voltage for
Boost VBATMIN As boost start-up 2.75 2.9 3.05 V
During boost mode 2.35 2.5 2.65
I2C Characteristics
Output Low Voltage VOL I
DS = 10mA -- -- 0.4 V
SCL, SDA Input Threshold
Voltage
VIH Logic high threshold 1.3 -- --
V
VIL Logic low threshold -- -- 0.4
SCL Clock -- -- 400 kHz
Load Capacitance CLOAD V
PULL_UP = 1.8V -- -- 1 pF
Note 1. Stresses beyond those listed Absolute Maximum Ratings may cause permanent damage to the device. These are
stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in
the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions may
affect device reliability.
Note 2. θJA is measured under natural convection (still air) at TA = 25°C with the component mounted on a high effective-
thermal-conductivity four-layer test board on a JEDEC 51-7 thermal measurement standard.
Note 3. Devices are ESD sensitive. Handling precaution is recommended.
Note 4. The device is not guaranteed to function outside its operating conditions.
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Typical Application Circuit
BATS
LX
PGND AGND
OTG
RT9458
1µH
C1, C2, C3
A5
D1, D2, D3
B4
VIN
To Adaptor/USB
C4
0.47µF
A1, A2, A3
47nF
BOOT
+
ISNSIN B5
D4
56m
10µF
VMID B1, B2, B3
10µF
SCL
C5
SDA
D5
IRQ
A4
Battery
0.1µF
Pin Description Part Number Package Manufacture
VIN 0.47F/25V/X5R GRM155R61E474K01 0402 muRata
VMID 10F/16V/X5R GRM188R61C106KAAL 0603 muRata
BOOT 0.047F/50V/X7R GCM155R71H473KE01 0402 muRata
ISNSIN 0.1F/10V/X5R GRM155R61A104KA01 0402 muRata
BATS 10F/6.3V/X5R GRM185R60J106ME15 0603 muRata
ISNSIN 56m/1% RL10FTNR056 0805 TA-I
LX 1H/20% DFE252012-H-1R0M 252012 TOKO
Below are recommended capacitor and inductor information
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Applications Information
The RT9458 is an integrated solution of single-cell Li-ion
and Li-polymer battery charger for portable applications.
The part integrates a synchronous PWM controller with
power MOSFETs to provide input voltage MIVR (Minimum
Input Voltage Regulation), input current sensing, high
accuracy current and voltage regulation, and charge
termination in a small package for space limited devices.
The part also features USB OTG (On-The-Go).
The RT9458 has three operation modes : charge mode,
boost mode (USB OTG), and high impedance mode. In
charge mode, the RT9458 supports a precision charging
system for single cell. In boost mode, the RT9458 works
as the Boost converter and boosts the voltage from battery
to VIN pin for sourcing the OTG devices. In high impedance
mode, the RT9458 stops charging or boosting and
operates in a mode with low current from VIN or battery to
reduce the power consumption when the portable device
is in standby mode.
S = Start Condition
W = Write (SDA = 0)
R = Read (SDA = 1)
Notice that the RT9458 does not integrate input power
source (AC adapter or USB input) detection. Thus, the
RT9458 does not set the charge current automatically.
The charge current needs to be set via I2C interface by
the host. The RT9458 application mechanism and I2C
compatible interface are introduced in later sections. The
slave address for this device is 1101010.
I2C Interface Timing Diagram
The RT9458 acts as an I2C -bus slave. The I2C -bus master
configures the settings for charge mode and boost mode
by sending command bytes to the RT9458 via the 2-wire
I2C -bus. After the START condition, the I2C master sends
a chip address. This address is seven bits long followed
by an eighth bit which is a data direction bit (R/W). The
second byte selects the register to which the data will be
written. The third byte contains data to the selected
register.
Charge Mode Operation
Support Quick Start Feature of Charger
When the battery voltage is lower than 2.4V by over-
discharge condition, the RT9458 charges the battery with
60mA to wake up the battery. Once the voltage level is
higher than 2.4V, the RT9458 charges the battery to higher
level with large current and makes sure that the system
could work normally in short period with OTG pin pulled
low.
ACK = Acknowledge
P = Stop Condition
Minimum Input Voltage Regulation (MIVR)
The RT9458 features input voltage MIVR function to prevent
input voltage drop due to insufficient current provided by
the adaptor or USB input. If MIVR function is enabled, the
input voltage decreases when the over current of the input
power source occurs and is regulated at a predetermined
voltage level which can be set as 4.1V to 4.7V per 0.1V
step by I2C interface to MIVR[2:0] in the register of address
0x11 the MIVR bit is set to high. At this time, the current
drawn by the RT9458 equals to the maximum current value
that the input power can provide at the predetermined
voltage level, instead of the set value.
B7
12345678912
B6 B2 B1 B0
3456789123456789
C5 C4 C3 C2 C1 C0WACK ACK
SP
0B4 ACK
SCL
SDA A0A1A2A3A4A5A6 B5 C7 C6B3
Start 1 1 0 1 0 1 0 R/W B7B6B5B4B3B2B1B0 C7C6C5C4C3C2C1C0 Stop
The 2nd Byte
(Data Address, Data) The 3rd Byte (Data)
The 1st Byte
(Slave Address, R/W)
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Figure 1. Minimum Input Voltage Regulation (MIVR)
Charge Profile
The RT9458 provides a precision Li-ion or Li-polymer
charging solution for single-cell applications. Input current
limit, charge current, termination current, charge voltage
and input voltage MIVR are all programmable via the I2C
interface. In charge mode, the RT9458 has five control
loops to regulate input current, charge current, charge
voltage, input voltage MIVR and device junction
temperature. During the charging process, all five loops
(if MIVR is enabled) are enabled and the dominant one
will take over the control.
For normal charging process, the Li-ion or Li-polymer
battery is charged in three charging modes depending on
the battery voltage. At the beginning of the charging
process, the RT9458 is in pre-charge mode. When the
battery voltage rises above pre-charge threshold voltage
(VPREC), the RT9458 enters fast-charge mode. Once the
battery voltage is close to the regulation voltage (VOREG),
the RT9458 enters constant voltage mode.
Pre-Charge Mode
For life-cycle consideration, the battery can not be charged
with large current under low battery condition. When the
BATS pin voltage is below pre-charge threshold voltage
(VPREC), the charger is in pre-charge mode with a weak
charge current which equals to the pre-charge current
(IPREC). In pre-charge mode, the charger basically works
as an LDO. The pre-charge current also acts as the current
limit when the BATS pin is shorted.
Fast-Charge Mode and Settings
As the BATS pin rises above VPREC, the charger enters
fast-charge mode and starts switching. Notice that the
RT9458 does not integrate input power source (AC adapter
or USB input) detection. Thus, the RT9458 does not set
the charge current automatically. Unlike the linear charger
(LDO), the switching charger (Buck converter) is a current
amplifier. The current drawn by the RT9458 is different
from the current into the battery. The user can set the
Average Input Current Regulation (AICR) and output charge
current (ICHRG) respectively.
Cycle-by-Cycle Current Limit
The charger of the RT9458 has an embedded cycle-by-
cycle current limit for inductor. Once the inductor current
touches the threshold (2.75A typ.), the charger stops
charging immediately to prevent over current from damaging
the device. Notice that, the mechanism can not be disabled
by any way.
Average Input Current Regulation (AICR)
The AICR setting is controlled by the AICR section (bit 7
and 6) in the register of address 0x01. The written value of
00 is for USB100 mode with the maximum current limit
of 100mA, 01 is for USB 500 mode with the maximum
current limit of 500mA and 10 is for the maximum
current limit of 1000mA. If the application does not need
input current limit, write 11 into the IINLIMIT section.
Charge Current (ICHRG)
The charge current into the battery is determined by the
sense resistor (RSENSE) and ICHRG section (bit4, bit5, and
bit6) in the register of address 0x06. The voltage between
the ISNSIN and BATS pins is regulated to the voltage
control by ICHRG section. The charge current equals to
the voltage between the ISNSIN and BATS pins (VICHRG)
divided by RSENSE :
ICHRG
CHRG SENSE
V
I = R
For example, for a 56mΩ sense resistor, the charge current
can be set from 500mA (ICHRG [2:0] = 000) to 1550mA
(ICHRG [2:0] = 111).
Expected IIN
VIN MIVR
VIN
IIN
Final IIN
set charge current
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Safety Timer in Charge Mode and in OTG Mode
To implement safety mechanism, the RT9458 has two
timer modes : T32min mode with a 32-minute timer for
charger mode and T32sec mode with a 32-second timer
for OTG mode.
In the charger mode, a the beginning of a charging
operation, the RT9458 enters T32min mode and starts a
32-minute timer that can be reset by any read or write
action performed by the host through the I2C interface. If
the 32-minute timer expires, the charging operation is
terminated and shows the fault bit CH32MI.
In the OTG mode, at the beginning of a OTG operation,
the RT9458 enters T32sec mode and starts a 32-second
timer that can be reset by any read or write action
performed by the host through the I2C interface. If the 32-
second timer expires, the OTG operation will keep going
but shows the fault bit BST32SI.
Input Voltage Protection in Charge Mode
During charge mode, there are two protection mechanisms
against poor input power source.
Sleep Mode (VIN
VBATS < VSLP)
The RT9458 enters sleep mode if the voltage drop between
the VIN and BATS pins falls below VSLP. In sleep mode,
the reverse blocking switch and PWM are all turned off.
This function prevents battery drain during poor or no input
power source.
Input Over-Voltage Protection
When VIN voltage rises above the input over-voltage
threshold (VINOVP), the RT9458 stops charging and then
sets fault status bits. The condition is released when VIN
falls below VINOVP VINOVP_Hys. The RT9458 then resumes
charging operation.
Boost Mode Operation (OTG)
IN_LIMIT
ICHRG
CHRG SENSE
I
V
I = MIN ,
RD






where D is the duty cycle and η is the efficiency.
Constant Voltage Mode and Settings
The RT9458 enters constant voltage mode when the BATS
voltage is close to the output-charge voltage (VOREG). Once
in this mode, the charge current begins to decrease. For
default settings (charge current termination is disabled),
the RT9458 does not turn off and always regulates the
battery voltage at VOREG. However, once the charge current
termination is enabled, the charger terminates if the charge
current is below termination current (IEOC) in constant
voltage mode. The charge current termination function is
controlled by the I2C interface in the TE bit via the
register of address 0x01.
After termination, a new charge cycle restarts when one
of the following conditions is detected :
The BATS pin voltage falls below the VOREG VRECH
threshold.
VIN Power On Reset (POR).
CHG_EN bit toggle or RST bit is set (via I2C interface).
Output Charge Voltage (VOREG)
The output-charge voltage is set by the I2C interface in
the CV section (Bit2 to Bit7 bits) via the register of address
0x02. Its range is from 3.5V to 4.45V. The default is 4.2V
(100011).
Termination Current (IEOC)
If the end of charge detection and shutdown control for
EOC are both enable (TE bit = 1, TE_SHDN_EN bit =
1), the end-of-charge current is determined by both the
change current (ICHRG) and IEOC percentage. IEOC
percentage is set by the I2C interface in the IEOC section
via the register of address 0x05. Its range is from 50mA to
400mA with an step of 50mA.
When input current limit and charge current are both set,
the charge current in fast charge phase is calculated as
below :
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Trigger and Operation
The RT9458 features USB OTG. When OTG function is
enabled, the synchronous boost control loop takes over
the power MOSFETs and reverses the power flow from
the battery to the VIN pin. In normal boost mode, the
VMID pin is regulated to 5V (typ.) and provides up to 1A
current to support other USB OTG devices connected to
the USB connector.
Output Over-Voltage Protection
In boost mode, the output over-voltage protection is
triggered when the VIN voltage is above the output OVP
threshold (6V typ.). When OVP occurs and the boost mode
is triggered by the OTG pin, the RT9458 goes back to
Boost Configure state. When VIN returns to normal
operating range, the condition is released and the boost
resumes switching. However, if the boost mode is triggered
by OPA bit, the RT9458 resets the OPA bit and goes back
to Charge Configure state with default charge parameters.
Output Overload Protection
The RT9458 provides an overload protection to prevent
the device and battery from damage when VIN is overload.
Once overload condition is detected, the reverse blocking
switch operates in linear region to limit the output current
while the VMID voltage remains in voltage regulation. If
the overload condition lasts for more than 32ms, the
RT9458 will recognise the overload fault condition and
resets registers to the default settings.
Control Bits
CHG_EN Bit (Charge Mode)
The CHG_EN bit in control register of address 0x07 is
used to disable or enable the charge process. A value of
0 disable the charge, while a value of 1 enable the
charge.
RST Bit
The RST bit in control register of address 0x04 is used to
reset the RT9458 back to its default value at power-up,
regardless of its charging or boosting process.
HZ (High Impedance Mode) Bit
When the HZ bit is set to 1 and the OTG pin is not in
active status, the RT9458 operates in high impedance
mode. The condition is released by POR or setting the
HZ bit to 0.
OPA Bit
The OPA bit is the operation mode control bit, which is
dependent on the status of HZ.
OPA
bit HZ
bit Operation
0 0
Charge mode (no fault)
Charge configure (fault, VIN > VUVLO)
High impedance mode (VIN < VUVLO)
1 0
Boost mode (no fault)
Go to charge configure when any fault
X 1 High impedance mode
Battery Protection
Battery Over-Voltage Protection in Charge Mode
The RT9458 monitors the BATS voltage for output over-
voltage protection. In charge mode, if the BATS voltage
rises above VBATOVP x VOREG, such as when the battery is
suddenly removed, the RT9458 stops charging and then
sets fault status bits. The condition is released when the
BATS voltage falls below (VBATOVP VBATOVP_Hys) x VOREG.
The RT9458 then resumes charging process with default
settings and the fault is cleared.
Battery Detection During Normal Charging
The RT9458 provides a battery absent detection scheme
to detect insertion or removal of the battery pack. The
battery detection scheme is valid only when the charge
current termination is enabled (TE bit = 1).
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Figure 2. Derating Curve of Maximum Power Dissipation
Thermal Considerations
The junction temperature should never exceed the
absolute maximum junction temperature TJ(MAX), listed
under Absolute Maximum Ratings, to avoid permanent
damage to the device. The maximum allowable power
dissipation depends on the thermal resistance of the IC
package, the PCB layout, the rate of surrounding airflow,
and the difference between the junction and ambient
temperatures. The maximum power dissipation can be
calculated using the following formula :
PD(MAX) = (TJ(MAX) TA) / θJA
where TJ(MAX) is the maximum junction temperature, TA is
the ambient temperature, and θJA is the junction-to-ambient
thermal resistance.
For continuous operation, the maximum operating junction
temperature indicated under Recommended Operating
Conditions is 125°C. The junction-to-ambient thermal
resistance, θJA, is highly package dependent. For a WL-
CSP-20B 2.1x1.87 (BSC) package, the thermal
resistance, θJA, is 40.8°C/W on a standard JEDEC 51-7
high effective-thermal-conductivity four-layer test board.
The maximum power dissipation at TA = 25°C can be
calculated as below :
PD(MAX) = (125°C 25°C) / (40.8°C/W) = 2.45W for a WL-
CSP-20B 2.1x1.87 (BSC) package.
The maximum power dissipation depends on the operating
ambient temperature for the fixed TJ(MAX) and the thermal
resistance, θJA. The derating curves in Figure 2 allows
the designer to see the effect of rising ambient temperature
on the maximum power dissipation.
During normal charging process, once the charge done
condition is satisfied (VBATS > VOREG VRECH and
termination current is detected), the RT9458 turns off the
PWM converter and initiates a discharge current (detection
current) for a detection time period. After that, the RT9458
checks the BATS voltage. If it is still above the recharge
threshold, the battery is present and charge done is
detected. If the BATS voltage is below the recharge
threshold, the battery is absent. Thus, the RT9458 stops
charging and the charge parameters are reset to the default
values. The charge resumes after a period of tDET (2sec.
typ.).
0.0
0.4
0.8
1.2
1.6
2.0
2.4
2.8
3.2
3.6
4.0
0 255075100125
Ambient Temperature (°C)
Maximum Power Dissipation (W) 1
Four-Layer PCB
Layout consideration
The RT9458 layout guideline is shown as follow. There
are several suggestion are provided.
The capacitor of VMID should be as close as possible
to RT9458 for reduce EMI.
The GND path of VMID and BATS capacitor need to
connect directly at TOP layer.
The traces of Rsense need to follow differential rule to
avoid the common mode noise.
The other layers are ground plane for improve thermal
performance.
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Figure 3. PCB Layout Guide
2520L
0603C
0402C
0603C
GND
BATSIRQVINVINVIN
ISNSINOTGVMIDVMIDVMID
SCLAGNDLXLXLX
SDABOOTPGNDPGNDPGND
0402C
0402C
GND
0805C
GND
VBAT
TOP Layer
Inner Layer1
Inner Layer2
Bottom Layer
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Keep Monitoring RT9458
Boost Mode
There are two methods to trigger boost mode.
I2C - Triggered Boost Mode
OTG Pin - Triggered Boost Mode (Pull High or Pull Low)
Pull High
Pull Low
AICR
VOREG
ICHRG, IEOC
High Impedance Mode
0 0 0 0 0 0 0 1Start Stop11010100 10001000
AICR
1A
Enable Termination
Current
Data address 0x01
Slave address W
0 0 0 0 0 0 1 0Start Stop11010100 10001110
VOREG
4.2V
Data address 0x02Slave address W
0 0 0 0 0 0 0 1Start Stop1 1 0 1 0 1 0 0 X X X X X X 1 X
Data address 0x01Slave address WHZ
00000001Start Stop1 1 0 1 0 1 0 0 X X X X X X 0 1
Data address 0x01Slave address WHZ OPA
00000010Start Stop1 1 0 1 0 1 0 0 X X X X X X 1 1
Data address 0x02Slave address W
OTG_PL
OTG_EN
00000010Start Stop1 1 0 1 0 1 0 0 X X X X X X 0 1
Data address 0x02Slave address W
OTG_PL
OTG_EN
0 0 0 0 0 1 1 0Start Stop1 1 0 1 0 1 0 0 0 1 1 1 0 0 1 0
ICHRG
Data address 0x06Slave address W
0 0 0 0 0 1 0 1Start Stop1 1 0 1 0 1 0 0 1 0 0 0 0 0 1 0
IEOC
150mA
Data address 0x05Slave address W
0 0 0 0 0 0 0 0Start 1 1 0 1 0 1 0 0 0 1 0 0 0 1 0 0
Data address 0x00Slave address W
< 32 min
X X X X X X X X
Charger Status
Stop
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Address Name Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0
0x03
Device ID VENDOR_ID CHIP_REV
Reset Value 0 0 0 0 0 0 0 1
Read/Write R R R R R R R R
0x00
Control1 Reserved Reserved STAT BOOST PWR_Rdy
OTG_
PinP Reserved
Reset
Value 0 1 0 0 0 0 0 0
Read/Write R/W R/W R R R R R R
0x01
Control2 IAICR[1:0]
TE_SHDN
_EN Higher_
OCP TE IAICR_
INT HZ OPA_
MODE
Reset
Value 0 0 0 0 0 0 0 0
Read/Write R/W R/W R/W R/W R/W R/W R/W R/W
0x02
Control3 VOREG[5:0] OTG_PL OTG_EN
Reset
Value 1 0 0 0 1 1 1 0
Read/Write R/W R/W R/W R/W R/W R/W R/W R/W
0x04
Control4 RST Reserved Reserved Reserved Reserved Reserved Reserved Reserved
Reset
Value 0 0 0 0 0 0 0 0
Read/Write R/W R/W R/W R/W R/W R/W R/W R/W
0x05
Control5 TMR_EN Reserved Reserved Reserved Reserved IEOC[2:0]
Reset
Value 1 0 0 0 0 0 1 0
Read/Write R/W R/W R/W R/W R/W R/W R/W R/W
0x06
Control6 IAICR_SEL ICHRG[2:0] FixFreq VPREC[2:0]
Reset
Value 0 0 0 0 0 0 1 0
Read/Write R/W R/W R/W R/W R/W R/W R/W R/W
0x07
Control7 Reserved BATD_EN Reserved CHG_EN VMREG[3:0]
Reset
Value 0 0 0 1 0 0 0 0
Read/Write R/W R/W R/W R/W R/W R/W R/W R/W
0x08
IRQ1 TSDI VINOVPI Reserved Reserved Reserved Reserved Reserved BATAB
Reset
Value 0 0 0 0 0 0 0 0
Read/Write R R R R R R R R
Device Address : 1101010
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Address Name Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0
0x09
IRQ2 CHRVPI Reserved CHBATOVI CHTERMI CHRCHGI CH32MI CHTREGI CHMIVRI
Reset
Value 0 0 0 0 0 0 0 0
Read/Write R R R R R R R R
0x0A
IRQ3 BSTVINOVI BSTOLI BSTLOWVI Reserved BST32SI Reserved Reserved Reserved
Reset
Value 0 0 0 0 0 0 0 0
Read/Write R R R R R R R R
0x0B
Mask 1 TSDM VINOVPI
M Reserved Reserved Reserved Reserved Reserved BATABM
Reset
Value 0 0 0 0 0 0 0 0
Read/Write R/W R/W R/W R/W R/W R/W R/W R/W
0x0C
Mask 2 CHRVPIM Reserved CHBATOVI
M CHTERMI
M CHRCHGI
M CH32MIM CHTREGI
M CHMIVRI
M
Reset
Value 0 0 0 0 0 0 0 0
Read/Write R/W R/W R/W R/W R/W R/W R/W R/W
0x0D
Mask 3 BSTVINOVI
M BSTOLIM BSTLOWVI
M Reserved BST32SI
M Reserved Reserved Reserved
Reset
Value 0 0 0 0 0 0 0 0
Read/Write R/W R/W R/W R/W R/W R/W R/W R/W
0x11
Control8 Reserved MIVR[2:0] Reserved Reserved IPREC[1:0]
Reset
Value 0 1 0 0 0 0 1 0
Read/Write R/W R/W R/W R/W R/W R/W R/W R/W
0x15
IRQ Status Reserved Reserved Reserved Reserved Reserved VINOVP THEMRE
G MIVR
Reset
Value 0 1 0 0 0 0 1 0
Read/Write R/W R/W R/W R/W R/W R/W R/W R/W
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Detail Table Descriptions
Address Name Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0
0x03
Device ID VENDOR_ID CHIP_REV
Reset Value 0 0 0 0 0 0 0 1
Read/Write R R R R R R R R
VENDOR_ID Vendor Identification
CHIP_REV Chip Revision
Address Name Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0
0x00
Control1 Reserved Reserved STAT BOOST PWR_Rdy OTG_PinP Reserved
Reset Value 0 1 0 0 0 0 0 0
Read/Write R/W R/W R R R R R R
STAT
Charger status bit
00 : Ready
01 : Charge in progress
10 : Charge done
11 : Fault
BOOST 1 : Boost mode, 0 : Not in Boost mode
PWR_Rdy Power status bit
0 : VIN > VOVP or VIN < VUVLO or VIN < BATS + VSLP (Power Fault)
1 : UVLO < VIN < VOVP & VIN > BATS + VSLP (Power Ready)
OTG_PinP OTG pin polarity
0 : OTG input pin is low
1 : OTG input pin is high
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Address Name Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0
0x01
Control2 IAICR[1:0] TE_SHDN_EN Reserved TE IAICR_INT HZ OPA_MODE
Reset Value 0 1 0 0 0 0 0 0
Read/Write R/W R/W R/W R/W R/W R/W R/W R/W
IAICR[1:0]
When IAICR_SEL = 0
00 : VIN 100mA current limit, 01 : VIN 500mA current limit,
10 : VIN 1A current limit, 11 : no input current limit (default 01)
When IAICR_SEL = 1
00 : VIN 100mA current limit, 01 : VIN 700mA current limit,
10 : VIN 700mA current limit, 11 : no input current limit (default 01)
TE_SHDN_EN 0 : When EOC is triggered, charge is not shutdown
1 : When EOC is triggered, charge is shutdown
TE 1 : Enable end of charge detection, 0 : Disable end of charge detection (default 0)
IAICR_INT
IAICR setting bit
0 : decided by external OTG pin, 500mA current limit when OTG pin is low and 100mA
current limit when OTG pin is high
1 : decided by internal I2C IAICR[1:0] code
HZ 1 : High impedance mode, 0 : Not high impedance mode (default 0)
OPA_MODE 1 : Boost mode, 0 : Charger mode (default 0)
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Address Name Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0
0x02
Control3 VOREG[5:0] OTG_PL OTG_EN
Reset Value 1 0 0 0 1 1 1 0
Read/Write R/W R/W R/W R/W R/W R/W R/W R/W
VOREG[5:0]
Battery regulation voltage / Boost output voltage. The delta-V of the Battery regulation
voltage is 20mV. The delta-V of the Boost output voltage is 25mV. Only from 101000 to
101001, the delta-V is 30mV for battery regulation voltage.
00 0000 : 3.5V / 4.425V
00 0001 : 3.52V / 4.45V
00 0010 : 3.54V / 4.475V
...
01 1000 : 3.98V / 5.025V
01 1001 : 4V / 5.05V
01 1010 : 4.02V / 5.075V
...
100010 : 4.18V / 5.3V
100011 : 4.2V / 5.325V
100100 : 4.22V / 5.35V
...
10 1000 : 4.3V / 5.425V
10 1001 : 4.33V / 5.45V
10 1010 : 4.35V / 5.475V
10 1011 : 4.37V / 5.5V
...
10 1111 : 4.45V / 5.6V
...
11 1111 : 4.45V / 5.6V
OTG_PL 1 : Active at High level, 0 : Active at low level (default 1)
OTG_EN 1 : Enable OTG Pin, 0 : Disable OTG Pin (default 0)
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Address Name Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0
0x04
Control4 RST Reserved Reserved Reserved Reserved Reserved Reserved Reserved
Reset Value 0 0 0 0 0 0 0 0
Read/Write R/W R/W R/W R/W R/W R/W R/W R/W
RST Write
1 : Charger in reset mode, 0 : No effect, Read : always get "0"
Address Name Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0
0x05
Control5 TMR_EN Reserved Reserved Reserved Reserved IEOC[2:0]
Reset Value 1 0 0 0 0 0 1 0
Read/Write R/W R/W R/W R/W R/W R/W R/W R/W
TMR_EN 0 : Disable internal timer function, 1 : Enable internal timer function (default 1)
IEOC[2:0]
000 : 50mA
001 : 100mA
010 : 150mA (default)
011 : 200mA
100 : 250mA
101 : 300mA
110 : 350mA
111 : 400mA
Address Name Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0
0x06
Control6 IAICR_
SEL ICHRG[2:0] FixFreq VPREC[2:0]
Reset Value 0 0 0 0 0 0 1 0
Read/Write R/W R/W R/W R/W R/W R/W R/W R/W
IAICR_SEL 0 : AICR is defined by IAICR [1:0]
1: AICR 500mA and 1A becomes 700mA
ICHRG[2:0]
External Sensing R : Charge current sense voltage (current equivalent for 56m sense
resistor)
000 : 28mV (500mA) (default 000)
001 : 36.4mV (650mA)
010 : 44.8mV (800mA)
---
110 : 78.4mV (1400mA)
111 : 86.8mV (1550mA)
VPREC[2:0]
000 : 2V
001 : 2.2V
010 : 2.4V (default 010)
011 : 2.6V
100 : 2.8V
101 : 3V
111 : 3V
Fix Freq 0 : Auto frequency change
1 : Fix frequency
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Address Name Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0
0x07
Control 7 Reserved BATD_EN Reserved CHG_EN VMREG[3:0]
Reset Value 0 0 0 1 0 0 0 0
Read/Write R/W R/W R/W R/W R/W R/W R/W R/W
BATD_EN Battery detection when charge done
0 : disable battery detection, 1 : enable battery detection
CHG_EN Charger enable
0 : charger is disabled, 1 : charger is enabled
VMREG[3:0]
Maximum battery regulation voltage/Maximum Boost output voltage.
The delta-V of Maximum battery regulation voltage is 20mV. The delta-V of Maximum Boost
output voltage is 25mV.
0000 : 4.2V / 5.3V (Default 0000)
0001 : 4.22V / 5.325V
0010 : 4.24V / 5.35V
...
1011 : 4.43V / 5.575V
1100 : 4.45V / 5.6V
1111 : 4.45V / 5.6V
Address Name Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0
0x08
IRQ 1 TSDI VINOVPI Reserved Reserved Reserved Reserved Reserved BATAB
Reset Value 0 0 0 0 0 0 0 0
Read/Write R R R R R R R R
TSDI Thermal shutdown fault. Set if the die temperature exceeds the thermal shutdown threshold.
When TSDI occurs, REG0 x 01[7:6]-AICR is reset to 01.
VINOVPI VIN over voltage protection. Set when VIN > VIN_OVP is detected
BATAB Battery absence
Address Name Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0
0x09
IRQ 2 CHRVPI Reserved CHBATOVI CHTERMI CHRCHGI CH32MI CHTREGI CHMIVRI
Reset Value 0 0 0 0 0 0 0 0
Read/Write R R R R R R R R
CHRVPI Charger fault. Reverse protection (VIN < BATS + VSLP)
CHBATOVI Charger fault. Battery OVP
CHTERMI Charge terminated
CHRCHGI Recharge request (VBATS < VOREG VRECH)
CH32MI Charger fault. 32m time-out (fault)
CHTREGI Charger warning. Thermal regulation loop active.
CHMIVRI Charger warning. Input voltage MIVR loop active.
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Address Name Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0
0x11
Control8 Reserved MIVR[2:0] Reserved Reserved IPREC[1:0]
Reset
Value 0 1 0 0 0 0 1 0
Read/Write R/W R/W R/W R/W R/W R/W R/W R/W
MIVR[2:0]
000 : 4.1V
001 : 4.2V
010 : 4.3V
011 : 4.4V
100 : 4.5V (default)
101 : 4.6V
110 : 4.7V
111 : disable
IPREC[1:0]
00 : 20mA
01 : 40mA
10 : 60mA (default)
11 : 60mA
Address Name Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0
0x0A
IRQ 3 BSTVINOVI BSTOLI BSTLOWVI Reserved BST32SI Reserved Reserved Reserved
Reset Value 0 0 0 0 0 0 0 0
Read/Write R R R R R R R R
BSTBUSOVI Boost fault. VIN OVP (VIN > VIN_BOVP)
BSTOLI Boost fault. Over load.
BSTLOWVI Boost fault. Battery voltage is too low.
BST32SI Boost fault. 32s time-out fault.
Reserved N/A
Reserved N/A
Reserved N/A
Address Name Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0
0x0B
MASK1 TSDM VINOVPIM Reserved Reserved Reserved Reserved Reserved BATABM
Reset Value 0 0 0 0 0 0 0 0
Read/Write R/W R/W R R R R R/W R/W
TSDM TSDI fault interrupt mask
0 : interrupt is not masked, 1 : interrupt is masked
VINOVPIM VIN OVP fault interrupt mask
0 : interrupt is not masked, 1 : interrupt is masked
BATABM Battery absence fault interrupt mask
0 : interrupt is not masked, 1 : interrupt is masked
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Address Name Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0
0x0C
MASK2 CHRVPIM Reserved
CHBATO
VIM CHTERMIM CHRCHGIM CH32MIM CHTREGIM CHMIVRM
Reset Value 0 0 0 0 0 0 0 0
Read/Write R/W R/W R/W R/W R/W R/W R/W R/W
CHRVPIM Charger reverse protection interrupt mask
0 : interrupt is not masked, 1 : interrupt is masked
CHBATOVIM Charger battery over voltage interrupt mask
0 : interrupt is not masked, 1 : interrupt is masked
CHTERMIM Charge terminated interrupt mask
0 : interrupt is not masked, 1 : interrupt is masked
CHRCHGIM Charger recharge request interrupt mask
0 : interrupt is not masked, 1 : interrupt is masked
CH32MIM Charger 32m timeout interrupt mask
0 : interrupt is not masked, 1 : interrupt is masked
CHTREGIM Charger thermal regulation loop active interrupt mask
0 : interrupt is not masked, 1 : interrupt is masked
CHMIVRM Charger input current voltage MIVR active interrupt mask
0 : interrupt is not masked, 1 : interrupt is masked
Address Name Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0
0x0D
MASK3 BSTVINO
VIM BSTOLIM BSTLOW
VIM Reserved BST32SIM Reserved Reserved Reserved
Reset Value 0 0 0 0 0 0 0 0
Read/Write R/W R/W R/W R/W R/W R/W R/W R/W
BSTVINOVIM Boost VIN over voltage interrupt mask
0 : interrupt is not masked, 1 : interrupt is masked
BSTOLIM Boost over load interrupt mask
0 : interrupt is not masked, 1 : interrupt is masked
BSTLOWVIM Boost low battery voltage interrupt mask
0 : interrupt is not masked, 1 : interrupt is masked
BST32SIM Boost 32s time out interrupt mask
0 : interrupt is not masked, 1 : interrupt is masked
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RT9458
Richtek Technology Corporation
14F, No. 8, Tai Yuen 1st Street, Chupei City
Hsinchu, Taiwan, R.O.C.
Tel: (8863)5526789
Richtek products are sold by description only. Richtek reserves the right to change the circuitry and/or specifications without notice at any time. Customers should
obtain the latest relevant information and data sheets before placing orders and should verify that such information is current and complete. Richtek cannot
assume responsibility for use of any circuitry other than circuitry entirely embodied in a Richtek product. Information furnished by Richtek is believed to be
accurate and reliable. However, no responsibility is assumed by Richtek or its subsidiaries for its use; nor for any infringements of patents or other rights of third
parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Richtek or its subsidiaries.
Outline Dimension
20B WL-CSP 2.1x1.87 Package (BSC)
Min Max Min Max.
A 0.500 0.600 0.020 0.024
A1 0.170 0.230 0.007 0.009
b 0.240 0.300 0.009 0.012
D 1.820 1.920 0.072 0.076
D1
E 2.050 2.150 0.081 0.085
E1
e
Symbol Dimensions In Millimeters Dimensions In Inches
1.200 0.047
1.600 0.063
0.400 0.016

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