LDOs Quick Reference Guide Datasheet by Texas Instruments

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{I} TEXAS INSTRUMENTS
Low Dropout Regulators
Quick Reference Guide
Low dropout linear regulators (LDOs) are a simple, effective way to regulate an output voltage powered from a higher
input voltage. The most critical LDO parameters are input voltage range, output voltage, output current, dropout
voltage, packaging size, power dissipation capability, and noise. In this quick reference guide you will find TI’s most
popular LDOs and linear voltage regulators for any kind of application, including industrial, personal electronics,
communications equipment and automotive.
To see the complete LDO portfolio:
www.ti.com/ldo
LDO
1 2 3 4 5 6 7 8 9 10 20 30 40 50 60 70 80 90 100
4 - 7.5
3
1.5
1
0.8
2
LP38690
LM2941TLV757P - 2x2mm SON
TPS743 - VDO: 55mV, Power Good
TPS7A83A – Noise: 6µVRMS, VDO: 85mV
TPS7A85A – Noise: 4.4µVRMS, VDO: 150mV
TPS7A84A – Noise: 4.4µVRMS, VDO: 110mV
TPS7A35 – Noise: 3.8µVRMS
TPS7A33 – Noise: 16µVRMS
TPS7A47 – Noise: 4µVRMS
TPS7A91 – Noise: 3.8µVRMS, Acc: 1%
TPS7A81 – Noise: 23µVRMS
TPS7A88 – Noise: 3.8µVRMS, Acc: 1%
TPS7A89 – Noise: 3.8µVRMS, Acc: 1%
LP38798 – Noise: 5µVRMS
TLV1117 – Acc: 1.6% over temp
TPS7A45 – Noise: 35µVRMS
TPS759 – Acc: 3% over temp
LM138/338 – Temp: -55 to 150°C (LM138)
TPS744 - VDO: 115mV, Power Good
LM1084 – Acc: 2% over temp
LM1085 – Acc: 2% over temp
LM117HV/317HV – Temp: -55 to 150°C (LM117HV)
LM137/337 – Temp: -55 to 150°C (LM137)
LM2990
TPS7A37 –
VDO
: 130mV, Acc: 1%
VIN (V)
1 2 3 4 5 6 7 8 9 10 20 30 40 50 60 70 80 90 100
VIN (V)
IOUT (A)
Low IQ (<15μA)
Low Noise (<30μVRMS)
Low Dropout
Small Package
Negative Rail
Dual Channel
General Purpose
LDOs for Industrial, Personal Electronics, Communications Equipment and more
1 2 3 4 5 6 7 8 9 10 20 30 40 50 60 70 80 90 100
VIN (V)
1 2 3 4 5 6 7 8 9 10 20 30 40 50 60 70 80 90 100
VIN (V)
0.2
0.15
0.1
0.05
IOUT (A)
LP5912 – 2x2mm SON, Noise: 12µVRMS
LP38693– 2x2mm SON, Noise: 12µVRMS
TPS7A87– Noise: 3.8μVRMS, Acc: 1%
TLV755P - 1x1mm SON
TPS7A19 - IQ: 15μA, Power Good
TPS747 - VDO: 50mV, Power Good
TPS736 – VDO: 75mV, Cap-Free
TPS723
TPS727 – 1.5x1.5mm SON
LP5907 – I
Q
: 12µA, Noise: 6.5µV
RMS
LP5910 – IQ: 12µA, Noise: 12µVRMS
TLV705 – 0.8x0.8mm CSP
TLV710 – 1.5x1.5mm SON
LP8900 – Noise: 6µVRMS
TPS731 – VDO: 30mV, Cap-Free
LP2992
TPS7A30 – Noise: 14µVRMS
TLV713P – 1x1mm SON, Cap-Free
TPS780/2 – IQ: 0.5µA
TPS706 – IQ: 1µA
TPS797 – IQ: 1.2µA
TPS709 – IQ: 1.35µA
TPS717 – Noise: 30µVRMS
TPS7A49 – Noise: 12.7µVRMS
TPS7A39 – Dual Positive and Negative LDO, Noise: 21µVRMS
LP2950/1 – TO-92
TPS7A40
TPS7A16 - IQ: 5μA, Power Good
TPS7B69 – IQ: 15μA
LM2936 – IQ: 15µA
TPS715A – IQ: 3.2µA
TLV760 – SOT23-3
0.3 - 0.5
TPS720 - 1.3x1mm CSP, VDO: 110mV
TLV733P – 1x1mm SON, Cap-Free
Low IQ (<15μA)
Low Noise (<30μVRMS)
Low Dropout
Small Package
Negative Rail
Dual Channel
General Purpose
LDOs for Industrial, Personal Electronics, Communications Equipment and more (continued)
2 | Low Dropout Regulators Quick Reference Guide Texas Instruments
Automotive (AEC-Q100) LDOs
1 2 3 4 5 6 7 8 9 10 20 30 40 50 60 70 80 90 100
VIN (V)
0.15
0.1
0.05
IOUT
(A)
0.2
TPS7B68-Q1 – IQ: 19µA, Window & Standard Watchdog Selectable
TPS7B4254-Q1 - Rev. Batt & Current Protection,Tracking Accuracy ± 4mV
TPS7B69-Q1 – IQ: 15µA
TPS7A66/9-Q1 – IQ: 12µA, Enable, Power Good
TPS7A16-Q1 - IQ: 5μA, Power Good
TPS798-Q1 – IQ: 40µA
TPS709-Q1 – IQ: 1µA
TPS7B4250-Q1 – Rev. Batt & Current Protection,Tracking Accuracy ± 5mV
TPS7A6650H-Q1 – Temp: -40 to 160°C
LM2936-Q1 – IQ: 15µA
LP2951-Q1 – IQ: 75µA
LP38693-Q1
LP5912-Q1 – 2x2mm, Noise: 12μVRMS
TLE4275-Q1 - Power Good
0.3
0.5
1
1.5
3+
2
TL720M05-Q1
TPS7B82-Q1 – IQ: 3µA
TPS7B4253-Q1 - IQ: 40µA, Rev. Batt & Current Protection
TPS748-Q1 – VDO: 60mV
TPS7A52-Q1 - Noise: 4.4μVRMS, VDO: 95mV
TPS7B63-Q1 – IQ: 19µA, Window & Standard Watchdog Selectable
TPS7B77-Q1 – Rev. Batt & Current Protection, Curent Sense, Adj. I-limit
1 2 3 4 5 6 7 8 9 10 20 30 40 50 60 70 80 90 100
VIN (V)
TPS7A88-Q1 – Noise: 3.8μVRMS, ACC: 1%
TPS7A81-Q1 – Noise: 23μVRMS, ACC: 1%
TPS7A54-Q1 - Noise: 4.4μVRMS, VDO: 150mV
TLV733P-Q1 – 2x2mm SON, Cap-Free
TPS720-Q1 - 2x2mm SON, VDO: 110mV
General Purpose
Watchdog LDO
Tracking LDO
Antenna LDO
Low IQ (<15μA)
Low Noise
Low Dropout
LP5907-Q1 – I
Q
: 12µA, Noise: 6.5µV
RMS
TLV713P-Q1 - Cap-Free
TPS7A53-Q1 - Noise: 4.4μVRMS, VDO: 110mV
Why LDOs?
Low noise and high PSRR
LDOs are able to filter ripple and power supply noise in
addition to voltage regulation. A low-noise, high-PSRR
LDO generates a clean DC rail that prevents the rest of
the power supply from compromising the performance of
signal conditioning, clocking, and other analog loads.
Low quiescent current (IQ)
A low IQ LDO allows for regulation from the battery while
minimizing current draw and maximizing battery life.
Low IQ LDOs are often paired with low-power
microcontrollers.
12 V
IN
DC/DC
OUT
SW 5 V ± 50 mV 3.3 V
IN
LP5912
OUT
3 | Low Dropout Regulators Quick Reference Guide Texas Instruments
3.8 V
I
OUT
I
GND
I
IN
VDD
MCU
IN OUT
TPS706
Small package size
TI LDOs come in a variety of sizes and types of packages,
including chip-scale, unleaded, leaded and wettable-flank
packages. A small solution size allows for optimal board
density.
Wide input voltage (VIN) range
Many voltage rails are prone to transient spikes during
startup or normal operation. TI’s wide VIN LDOs are able to
accommodate these transient voltages without additional
protection or external circuitry.
Powering processors and FPGAs
Accurate power supplies with good transient response
characteristics are required for many processors and
FPGAs. TI’s LDOs satsify these requirements while also
offering high current capability, ultralow dropout and
monotonic startup.
Powering signal conditioning circuits
Many signal-conditioning devices, like amplifiers, require
dual supply (±) voltages. Many TI LDOs are available in
complementary pairs for generating low-noise positive and
negative supply rails.
TLV705
TLV733P
TPS715
0.65mm
0.65mm
1mm
1mm
2mm
2.2mm
3.3 V12 V
TPS7B69
IN OUT
1.25 V
OUT
BIAS
RESET
IN
1.0 V ± 1%
VDD
PG
FB
5 V
EN
NR/SS
3.5 A
TPS7A85
Processor
IN OUT
NR/SS FB
EN
IN OUT
NR/SS FB
EN
17 V
-17 V
15 V
-15 V
OPA192
TPS7A47
TPS7A33
4 | Low Dropout Regulators Quick Reference Guide Texas Instruments
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© 2018 Texas Instruments Incorporated SLYT228P
Design factors
Dropout voltage (VDO) – The minimum differential VIN must maintain above VOUT for proper regulation.
Dropout determines how efficiently an LDO may operate while still maintaining output voltage regulation.
Package – TI’s LDOs are available in chip-scale, leaded (ex. SOT23-3), and unleaded (ex. X2SON) packages.
The smallest LDOs in TI’s portfolio are 0.65 mm x 0.65 mm.
Ground current (IGND) – The current the LDO consumes as part of operation. When there is a light load, or none at
all, this is referred to as quiescent current (IQ). Minimizing ground current is critical to extending battery life and
ensuring more efficient system operation.
Output noise – The internal noise generated by the LDO that manifests at the output. A low-noise output is critical
to ensuring optimal performance for analog and clocking circuitry.
Power supply rejection ratio (PSRR) – The measurement of an LDO’s ability to reject AC elements like ripple
voltage. High PSRR over a wide bandwidth is critical to attenuating switching noise and generating a clean DC rail.
Output accuracy – The output voltage deviation. Accuracy is affected by temperature, the input voltage, the
output current, and manufacturing variations.
Enable (EN) – Enables or disables the output of the LDO. Also known as Shutdown (SHDN), disabling the device
minimizes ground current when regulation is not required.
Power good (PG) – An open-drain output that signals the output voltage has almost reached its target value.
A PG output can be used to keep a microcontroller in reset or to sequence additional power supplies.
Transient response – The output response to a change in input voltage or load current. Having the output voltage
respond quickly to changes in load or line voltage with minimal ringing is critical when powering sensitive analog
and digital loads.
Soft-start (SS) – Controls the slew rate of the output during startup. A controlled, monotonic startup is required to
combat inrush current stemming from capacitive loads.
Noise-reduction (NR) – Reduces the noise emanating from the internal reference voltage. Adding a capacitor at
this pin forms a low-pass filter that reduces output noise.
Bias voltage – An auxiliary rail for achieving lower dropout. LDOs with an NMOS architecture require a bias voltage
or an internal charge pump to achieve low dropout at low output voltages.
Thermal resistance (θJA) – The relationship between power dissipation and the resultant junction temperature
increase. Low thermal resistance is key to avoiding entering thermal shutdown as a result of regulation. Packages
with a thermal pad or heat slug typically have the lowest θJA values.
Thermal shutdown – An internal protection circuit that disables the output of the LDO when junction temperature
becomes too high. Thermal shutdown is triggered by excess dissipation across the LDO and/or hot ambient
temperatures.
AEC-Q100 qualification – Many of TI’s LDOs are qualified for use in automotive applications. This is indicated by a
“-Q1” suffix. Other devices can be qualified upon request.
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