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LDL1117S25R

1.2A LDO, 2.5V fixed, 350mV dropout, 87dB PSRR, 2.6-18V input, SOT-223

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Manufacturer Part：

LDL1117S25R

Package：

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

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Description

Product Overview

The LDL1117S25R from STMicroelectronics is a 1.2A high-PSRR low-dropout linear voltage regulator with a fixed 2.5V output. It features 350mV typical dropout at full load, 87dB PSRR at 120Hz, 500uA quiescent current, and comprehensive protection in a compact SOT-223 package.

Key Specifications

Manufacturer STMicroelectronics
Output Voltage 2.5V (fixed)
Output Current 1.2A
Input Voltage Range 2.6V to 18V (20V AMR)
Dropout Voltage 350mV typ @ 1.2A
Quiescent Current 250uA typ, 500uA max
PSRR 87dB @ 120Hz
Output Accuracy +-2% to +-3%
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
  • Wide input voltage: 2.5V to 18V (20V AMR)
  • Fixed 2.5V output with +-2% accuracy
  • 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

  • SMPS post-regulation and DC-DC converter secondary regulation
  • Consumer and industrial power supplies
  • Motherboard point-of-load regulation
  • Battery-powered portable devices
  • Low-voltage microcontroller power rails

The STMicroelectronics LDL1117S25R is a 1.2A high-PSRR low-dropout linear voltage regulator providing a fixed 2.5V output from an input voltage range of 2.6V to 18V. With a typical dropout voltage of only 350mV at 1.2A, it is suitable for applications where the input-to-output differential is small. The high power supply rejection ratio of 87dB at 120Hz, rolling down to more than 40dB at 100kHz, makes the LDL1117 particularly suitable for direct regulation in switch-mode power supplies and secondary linear regulation in DC-DC converters. The device includes comprehensive protection with current limit, safe operating area (SOA), and thermal shutdown. Stable operation is achieved with ceramic output capacitors as small as 1uF.

The LDL1117S25R operates as a series-pass linear regulator with four key functional blocks: 1) Bandgap Reference: A precision bandgap voltage reference generates the internal reference voltage. The 2.5V output is derived from this reference through laser-trimmed resistive dividers, ensuring +-2% initial accuracy. 2) Error Amplifier: The error amplifier compares a fraction of the output voltage with the bandgap reference and drives the pass transistor to maintain regulation. The compensation is designed for stability with ceramic capacitors from 1uF to 100uF. 3) Pass Element: The NPN pass transistor provides the current path from input to output with low dropout voltage of 350mV at 1.2A. 4) Protection Circuits: Current limiting, SOA protection, and thermal shutdown (junction temperature limit) safeguard the device against overload, excessive power dissipation, and thermal stress conditions.

Pin Name Type Function
1 GND Ground Ground connection
2 VOUT Output Regulated 2.5V output; tab connected internally
3 VIN Input Unregulated input voltage (2.6V to 18V)
4 (Tab) VOUT Output Output connection / thermal pad
  • SMPS secondary-side post-regulation for noise-sensitive circuits
  • Point-of-load 2.5V regulation on industrial and consumer motherboards
  • DC-DC converter output cleanup with high PSRR
  • Battery-powered devices requiring stable 2.5V rail
  • Low-voltage FPGA and CPLD core power supply
Manufacturer Part Number Package Notes
ST LDL1117S12R SOT-223 1.2V version, same series
ST LDL1117S33R SOT-223 3.3V version, same series
TI TLV1117LV25DCYR SOT-223 1.5A, 2.5V LDO, lower Iq
onsemi NCP1117ST25T3G SOT-223 1A, 2.5V LDO
TI TLV76125DCYR SOT-223 1A, 2.5V, newer alternative
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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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