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LD1117S50CTR

800mA LDO, 5.0V fixed, 1V dropout, +-1% accuracy, 75dB PSRR, SOT-223

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Manufacturer Part：

LD1117S50CTR

Package：

SOT-223-4 (6.5 x 3.5 x 1.8 mm)

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Description

Product Overview

The LD1117S50CTR from STMicroelectronics is a low-drop positive voltage regulator providing a fixed 5.0V output at up to 800mA. It features 1V typical dropout voltage, +-1% output accuracy at 25C, 75dB supply voltage rejection, and NPN pass transistor for high efficiency, in a SOT-223 surface-mount package.

Key Specifications

Manufacturer STMicroelectronics
Output Voltage 5.0V (fixed)
Output Current 800mA
Input Voltage Range 6.5V to 15V
Dropout Voltage 1.0V typ, 1.2V max @ 800mA
Output Accuracy +-1% at 25C
Quiescent Current 5mA typ (into load)
PSRR 75dB typ @ 120Hz
Output Noise 100uVrms (10Hz-10kHz)
Package SOT-223-4
Operating Temperature 0C to +125C

Features

  • Low dropout voltage: 1V typical at 800mA
  • Output current up to 800mA (1.3A peak)
  • Fixed 5.0V output with +-1% accuracy at 25C
  • NPN pass transistor for high efficiency
  • Supply voltage rejection: 75dB typical
  • Internal current limiting and thermal shutdown
  • Only 10uF output capacitor required for stability
  • Available in +-1% and +-2% tolerance grades
  • Pin-compatible with standard 1117 regulators

Applications

  • 5V power supply regulation
  • Battery-powered equipment
  • Post-regulation for switching supplies
  • Embedded system power rails
  • Consumer electronics

The STMicroelectronics LD1117S50CTR is a low-drop positive voltage regulator capable of providing up to 800mA of output current at a fixed 5.0V. The NPN pass transistor ensures high efficiency since the quiescent current flows mostly into the load, unlike PNP-based LDOs. The on-chip trimming allows the regulator to achieve very tight output voltage tolerance of +-1% at 25C. With a typical dropout voltage of only 1V at 800mA, the LD1117 is suitable for applications where the input-to-output voltage differential is limited. A minimum 10uF output capacitor is required for stability. The device includes internal current limiting and thermal shutdown protection for reliable operation.

The LD1117S50CTR operates as a series-pass linear regulator using an NPN pass transistor topology: 1) Reference and Error Amplifier: A bandgap voltage reference generates a stable internal reference voltage. The error amplifier continuously compares the output feedback with this reference and drives the NPN pass transistor to maintain the output at 5.0V. 2) NPN Pass Element: Unlike PNP-based LDOs, the NPN pass transistor draws its base current from the input supply, and the quiescent current flows into the load rather than to ground. This results in higher efficiency, especially at lighter loads. The dropout voltage is determined by the VCE(sat) of the NPN transistor, typically 1V at 800mA. 3) Protection: Internal current limiting prevents excessive output current, and thermal shutdown protects the device from overheating during fault conditions.

Pin Name Type Function
1 GND/ADJ Ground Ground terminal (fixed 5V version)
2 VOUT Output Regulated 5.0V output; internally connected to tab
3 VIN Input Unregulated input voltage (6.5V to 15V)
4 (Tab) VOUT Output Thermal tab connected to VOUT
  • 5V power regulation from 6.5V-15V sources in embedded systems
  • Post-regulation after switching converters for low-noise 5V rails
  • Battery-powered equipment requiring efficient 5V regulation
  • Consumer electronics and computer peripheral power supplies
  • Industrial control systems with 9V or 12V input sources
Manufacturer Part Number Package Notes
ST LDL1117S50R SOT-223 Newer, 1.2A, higher PSRR version
TI LM1117MPX-5.0/NOPB SOT-223 800mA, 5V, +-1% accuracy
onsemi NCP1117ST50T3G SOT-223 1A, 5V LDO
TI TLV1117LV50DCYR SOT-223 1.5A, lower Iq, newer
Microchip MCP1825S-5002E/DB SOT-223 500mA, 5V, low Iq
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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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