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LDL1117S12R

1.2A LDO, 1.2V fixed, 350mV dropout, 87dB PSRR, 2.6-18V input, SOT-223

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Manufacturer Part：

LDL1117S12R

Package：

SOT-223-4 (6.7 x 3.7 x 1.7 mm)

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Description

Product Overview

The LDL1117S12R from STMicroelectronics is a 1.2A high-PSRR low-dropout linear voltage regulator with a fixed 1.2V output. It features 350mV typical dropout at full load, 87dB PSRR at 120Hz, 250uA typical quiescent current, and comprehensive protection in a SOT-223 package.

Key Specifications

Manufacturer STMicroelectronics
Output Voltage 1.2V (fixed, 1.185V nominal)
Output Current 1.2A
Input Voltage Range 2.6V to 18V (20V AMR)
Dropout Voltage 350mV typ @ 1.2A
Quiescent Current 250uA typ
PSRR 87dB @ 120Hz
Output Noise 60uVrms
Package SOT-223-4
Operating Temperature -40C to +125C

Features

  • Guaranteed 1.2A output current
  • Low dropout: 350mV typical at 1.2A
  • High PSRR: 87dB at 120Hz, >40dB at 100kHz
  • Fixed 1.2V output (1.185V nominal)
  • Low output noise: 60uVrms
  • Internal current limit, SOA, and thermal protection
  • Stable with ceramic output capacitors (1uF minimum)
  • Compact SOT-223 surface-mount package

Applications

  • FPGA and CPLD core voltage regulation
  • SMPS post-regulation and DC-DC converter secondary regulation
  • Consumer and industrial power supplies
  • Low-voltage digital IC power rails
  • Point-of-load regulation on motherboards

The STMicroelectronics LDL1117S12R is a 1.2A high-PSRR low-dropout linear voltage regulator providing a fixed 1.2V output from an input voltage range of 2.6V to 18V. The 1.2V output is well-suited for modern low-voltage FPGA, CPLD, and microcontroller core supply requirements. With a typical dropout voltage of 350mV at 1.2A, it can regulate efficiently from low input voltages. The high PSRR of 87dB at 120Hz and greater than 40dB at 100kHz makes it ideal for cleaning noisy switch-mode supply outputs. The device includes internal current limit, safe operating area, and thermal shutdown protection. It is stable with ceramic output capacitors from 1uF to 100uF.

The LDL1117S12R operates as a series-pass linear voltage regulator with three key subsystems: 1) Reference and Error Amplifier: A bandgap voltage reference provides the stable reference voltage. The error amplifier compares a fraction of the output with this reference and drives the pass element to maintain regulation at 1.2V. 2) Pass Element: The internal NPN pass transistor provides the current path from VIN to VOUT with low dropout voltage. At 1.2A load, the typical dropout is 350mV. 3) Protection: Current limiting protects against short circuits, SOA protection ensures safe operation during transients, and thermal shutdown disables the output when the junction temperature exceeds the safe limit. The high PSRR is achieved through the internal bias generator and well-compensated error amplifier design.

Pin Name Type Function
1 GND Ground Ground connection
2 VOUT Output Regulated 1.2V output; tab connected internally
3 VIN Input Unregulated input voltage (2.6V to 18V)
4 (Tab) VOUT Output Output connection / thermal pad
  • Low-voltage FPGA and CPLD core power supply regulation at 1.2V
  • SMPS post-regulation for noise-sensitive low-voltage digital circuits
  • Point-of-load 1.2V regulation on motherboards and embedded systems
  • DC-DC converter secondary regulation with high PSRR requirements
Manufacturer Part Number Package Notes
ST LDL1117S25R SOT-223 2.5V version, same series
ST LDL1117S18R SOT-223 1.8V version, same series
TI TLV1117LV12DCYR SOT-223 1.5A, 1.2V LDO, lower Iq
onsemi NCP1117ST12T3G SOT-223 1A, 1.2V LDO
TI TLV76112DCYR SOT-223 1A, 1.2V, newer device
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Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

Shipping & Payment

All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

Service & Packaging

All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

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