LT3042 Power Supply Ripple Rejection (PSRR) Low-Dropout Voltage Linear Regulator

Linear Technology's LT3042, 20 V, 200 mA RF LDO with ultra-low (0.8 μV) noise and 79 dB PSRR at 1 MHz powers noise-sensitive applications

Image of Linear Technology LT3042 Linear RegulatorLinear Technology’s LT3042 is a high-performance, low-dropout, linear regulator featuring LTC’s ultra-low-noise and ultra-high PSRR architecture for powering noise sensitive RF applications. Designed as a precision current reference followed by a high-performance voltage buffer, the LT3042 can be easily paralleled to further reduce noise, increase output current, and spread heat on the PCB. The device supplies 200 mA at a typical 350 mV dropout voltage. Operating quiescent current is nominally 2 mA and drops to less than 1 μA in shutdown. The LT3042’s wide output voltage range (0 V to 15 V), while maintaining unity gain operation, provides virtually constant output noise, PSRR, bandwidth, and load regulation independent of the programmed output voltage. Additionally, the regulator features programmable current limit, fast start-up capability, and programmable power good to indicate output voltage regulation. The LT3042 is stable with a minimum 4.7 μF ceramic output capacitor. Built-in protection includes reverse battery protection, reverse current protection, internal current limit with foldback, and thermal limit with hysteresis. The LT3042 is available in thermally enhanced 10-lead MSOP and 3 mm × 3 mm DFN packages.

Video: LT3042 Ultra-low noise, ultra-high PSRR

Typical Application:

Image of Linear Tech LT3042 Typical Application
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Features
  • Ultra-low spot noise: 2 nV/√Hz at 10 kHz
  • Ultra-high PSRR: 79 dB at 1 MHz
  • Output current: 200 mA
  • Wide input voltage range: 1.8 V to 20 V
  • Single capacitor improves noise and PSRR
  • 100 μA SET pin current: ±1% initial accuracy
  • Single resistor programs output voltage
  • High bandwidth: 1 MHz
  • Programmable current limit
  • Low dropout voltage: 350 mV
  • Output voltage range: 0 V to 15 V
  • Programmable power good
  • Fast start-up capability
  • Precision enable/UVLO
  • Parallelable for lower noise and higher current
  • Internal current limit with foldback
  • Minimum output capacitor: 4.7 μF ceramic
  • Reverse battery and reverse current protection
  • 10-lead MSOP and 3 mm × 3 mm DFN packages
 Applications    
  • RF power supplies: PLLs, VCOs, mixers, LNAs
  • Very low noise instrumentation
  • High-speed/high-precision data converters
 
  • Medical applications: imaging, and diagnostics
  • Precision power supplies
  • Post-regulator for switching supplies

LT3042 Series

ImageManufacturer Part NumberDescriptionAvailable QuantityView Details
LT3042EMSE#TRPBF datasheet linkIC REG LIN POS ADJ 200MA 10MSOPLT3042EMSE#TRPBFIC REG LIN POS ADJ 200MA 10MSOP4753 - Immediate
LT3042EMSE#TRPBF product page link
LT3042EMSE#PBF datasheet linkIC REG LIN POS ADJ 200MA 10MSOPLT3042EMSE#PBFIC REG LIN POS ADJ 200MA 10MSOP2996 - Immediate
LT3042EMSE#PBF product page link
LT3042IMSE#PBF datasheet linkIC REG LIN POS ADJ 200MA 10MSOPLT3042IMSE#PBFIC REG LIN POS ADJ 200MA 10MSOP1663 - Immediate
LT3042IMSE#PBF product page link
LT3042EDD#PBF datasheet linkIC REG LIN POS ADJ 200MA 10DFNLT3042EDD#PBFIC REG LIN POS ADJ 200MA 10DFN0LT3042EDD#PBF product page link
LT3042IDD#PBF datasheet linkIC REG LIN POS ADJ 200MA 10DFNLT3042IDD#PBFIC REG LIN POS ADJ 200MA 10DFN0LT3042IDD#PBF product page link
LT3042HDD#PBF datasheet linkIC REG LIN POS ADJ 200MA 10DFNLT3042HDD#PBFIC REG LIN POS ADJ 200MA 10DFN1 - Immediate
LT3042HDD#PBF product page link
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Demo Boards

ImageManufacturer Part NumberDescriptionAvailable QuantityView Details
DC2246B datasheet linkDEMO BOARD LT3042EDDDC2246BDEMO BOARD LT3042EDD3 - Immediate
DC2246B product page link
DC2429A datasheet linkREF BOARD AND PLL/VCO SUPPLYDC2429AREF BOARD AND PLL/VCO SUPPLY5 - Immediate
DC2429A product page link
Published: 2016-01-18