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LP2951ACM

100mA adjustable LDO, 2.3V-30V input, 380mV dropout, shutdown + error flag, SOIC-8

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Manufacturer Part：

LP2951ACM

Package：

SOIC-8 (5 x 3.98 x 1.5 mm)

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Description

Product Overview

The LP2951ACM from Texas Instruments is a 100mA, 30V low-dropout voltage regulator with adjustable output from 1.24V to 29V. It features a shutdown pin, error flag output, 75uA quiescent current, and 380mV typical dropout voltage, housed in an 8-pin SOIC package for industrial applications.

Key Specifications

Manufacturer Texas Instruments
Output Type Adjustable (1.24V ~ 29V)
Output Current 100mA
Input Voltage Range 2.3V ~ 30V
Dropout Voltage 380mV (typ) @ 100mA
Quiescent Current 75uA (typ)
Reference Voltage 1.235V
Line Regulation 0.03% (typ)
Load Regulation 0.04% (typ)
Package SOIC-8
Operating Temperature -40°C ~ 125°C

Features

  • Wide input voltage range: 2.3V to 30V
  • Adjustable output: 1.24V to 29V via external resistor divider
  • Low quiescent current: 75uA typical
  • Low dropout voltage: 380mV typical at 100mA
  • Shutdown pin for power conservation
  • Error flag output indicates output voltage status
  • Current limiting and thermal shutdown protection
  • Stable with ceramic output capacitors (1uF to 100uF)

Applications

  • Battery-powered instruments and portable devices
  • Industrial control and automation systems
  • Automotive electronics and after-market modules
  • Power supply sequencing using error and shutdown pins
  • Low-power microcontroller supply regulation

The Texas Instruments LP2951ACM is a micropower low-dropout voltage regulator capable of supplying up to 100mA of load current with an input voltage range of 2.3V to 30V. The output voltage is adjustable from 1.24V to 29V using an external resistor divider. The device features an extremely low quiescent current of 75uA typical, making it ideal for battery-powered applications where supply current must be minimized. A shutdown pin allows the regulator to be turned off, reducing supply current to near zero. The error flag output provides an early warning when the output voltage drops below regulation, useful for power supply sequencing and supervision. The regulator is stable with ceramic output capacitors from 1uF to 100uF.

The LP2951ACM operates as a series-pass linear regulator with several control and monitoring features: 1) Voltage Regulation Core: The bandgap reference produces a stable 1.235V that is compared with the feedback voltage by the error amplifier. The pass transistor is driven to maintain the output at the programmed voltage. 2) Shutdown Control: The SHUTDOWN pin, when driven above 2V, disables the regulator and reduces input current to near zero. When driven below 0.8V, normal operation resumes. 3) Error Flag: The ERROR output goes low when the feedback voltage drops below approximately 92.5% of the nominal value, providing a dropout warning. This is useful for microprocessor reset or power-fail detection. 4) Protection: Internal current limiting and thermal shutdown protect the device from damage under overload or excessive power dissipation conditions.

Pin Name Type Function
1 VOUT Output Regulated output voltage
2 SENSE Input Output voltage sense (tie to VOUT for fixed mode)
3 SHUTDOWN Input Regulator shutdown control (active high)
4 GND Ground Ground connection
5 ERROR Output Error flag output (active low, open collector)
6 FEEDBACK Input Feedback input (tie to VTAP for fixed mode)
7 VTAP Output Internal resistor tap (tie to FEEDBACK for fixed mode)
8 VIN Input Unregulated input voltage (2.3V to 30V)
  • Battery-powered instruments requiring long operating life with low quiescent current
  • Industrial control systems needing wide input voltage range regulation
  • Power supply sequencing using error flag and shutdown control
  • Automotive after-market modules operating from 12V or 24V systems
  • Microcontroller and sensor power regulation in low-power designs
Manufacturer Part Number Package Notes
TI LP2951ACM/NOPB SOIC-8 Same device, full orderable part
TI LP2951ACMDR SOIC-8 Tape and reel version
TI LP2950AC-5.0 TO-92 Fixed 5V, 3-pin version
Microchip MCP1703AT-5002E/MC SOT-23-3 250mA, 5V fixed, 2V-16V input
onsemi NCP511SN25T1G TSOP-5 150mA, adjustable, 16V max
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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.

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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