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LP5951

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150-mA, low-IQ, low-dropout voltage regulator with enable

Data sheet
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150-mA, low-IQ, low-dropout voltage regulator with enable

LP5951

ACTIVE
Data sheet Order now

Product details

Parameters

Output options Fixed Output Iout (Max) (A) 0.15 Vin (Max) (V) 5.5 Vin (Min) (V) 1.8 Vout (Max) (V) 3.7 Vout (Min) (V) 1.3 Fixed output options (V) 1.3, 1.5, 1.8, 2, 2.5, 2.8, 3, 3.3, 3.7 Noise (uVrms) 125 Iq (Typ) (mA) 0.029 Thermal resistance θJA (°C/W) 196 Load capacitance (Min) (µF) 1 Rating Catalog Regulated outputs (#) 1 Features Enable Accuracy (%) 3 PSRR @ 100 KHz (dB) 32 Dropout voltage (Vdo) (Typ) (mV) 200 Operating temperature range (C) -40 to 125 open-in-new Find other Linear regulators (LDO)

Package | Pins | Size

SOT-23 (DBV) 5 5 mm² 2.9 x 1.6 SOT-SC70 (DCK) 5 4 mm² 2 x 2.1 open-in-new Find other Linear regulators (LDO)

Features

  • Input Voltage Range: 1.8 V to 5.5 V
  • Output Voltage Range: 1.3 V to 3.7 V
  • Excellent Line Transient Response: ±2 mV (typical)
  • Excellent PSRR: –60 dB at 1 kHz typical
  • Low Quiescent Current of 29 µA typical
  • Small SC70-5 and SOT-23-5 Packages
  • Fast Turnon Time of 30 µs typ.
  • Typical < 1 nA Quiescent Current in Shutdown
  • Ensured 150-mA Output Current
  • Logic Controlled Enable 0.4 V/0.9 V
  • Good Load Transient Response of 50 mVpp (typical)
  • Thermal Overload and Short-Circuit Protection
  • -40°C to 125°C Junction Temperature Range
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Description

The LP5951 regulator is designed to meet the requirements of portable battery-powered systems providing a regulated output voltage and low quiescent current. When switched to shutdown mode via a logic signal at the Enable (EN) pin, the power consumption is reduced to virtually zero.

The LP5951 is designed to be stable with small 1-µF ceramic capacitors. The device also features internal protection against short-circuit currents and over-temperature conditions.

Performance is specified for a –40°C to 125°C temperature range.

The device is available in fixed output voltages in the range of 1.3 V to 3.7 V. For availability, please contact your local TI sales office.

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Technical documentation

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Type Title Date
* Datasheet LP5951 Micropower, 150-mA Low-Dropout CMOS Voltage Regulator datasheet (Rev. G) Dec. 15, 2014
Application note A Topical Index of TI LDO Application Notes (Rev. F) Jun. 27, 2019
Technical article LDO basics: capacitor vs. capacitance Aug. 01, 2018
Technical article LDO Basics: Preventing reverse current Jul. 25, 2018
Technical article LDO basics: introduction to quiescent current Jun. 20, 2018
Technical article LDO basics: noise – part 1 Jun. 14, 2017
User guide AN-1486 LP5951 Evaluation Board (Rev. C) Apr. 30, 2013

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

EVALUATION BOARD Download
document-generic User guide
99
Description
The LDC2114EVM (Evaluation Module) demonstrates the use of inductive sensing to detect a button press on a monolithic piece of metal.  The EVM can connect up to 4 buttons using the LDCTOUCHCOMCOILEVM or customized coils designed through Webench.  Button presses & levels of pressure are (...)
Features
  • <7µA at 0.625 samples per second
  • Up to 4 buttons supported
  • Dedicated button logic outputs
  • Integrated and configurable algorithms for button press detection
View details
EVALUATION BOARD Download
document-generic User guide
49
Description

The LP5951 regulator is designed to meet the requirements of portable, battery-powered systems providing a regulated output voltage and low quiescent current. When switched to shutdown mode via a logic signal at the Enable pin, the power consumption is reduced to virtually zero.

The LP5951 is (...)

Features
  • Excellent line transient response: plus or minus 2mV typ.
  • Excellent PSRR: -60dB at 1kHz typ.
  • Low quiescent current of 29 microA typ.
  • 1.8 to 5.5V input voltage range
  • Small SC70-5 and SOT23-5 packages
  • Fast turn-on time of 30 mcro seconds typ.
  • Typ. < 1nA quiescent current in shutdown
  • Guaranteed 150mA output (...)
View details

Reference designs

REFERENCE DESIGNS Download
LDC0851 Event Counting Reference Design
TIDA-00851-LDC0851 — An inductive sensing (LDC)-based event counting design providing a robust and low-cost interface for speed measurement and event counting applications.  The solution doesn't require magnets and reliably operates in environments with dirt, moisture or oil that usually pose challenges for (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Inductive Sensing 32-Position Encoder Knob Reference Design using the LDC0851
TIDA-00828 — An inductive sensing based incremental encoder knob design can provide a robust and low-cost interface for control inputs.  It can reliably operate in environments which have dirt, moisture, or oil which would pose issues for alternate sensing technologies. This solution requires no magnets.
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Inductive Sensing 32-Position Encoder Knob Reference Design using the LDC1312/LDC1314
TIDA-00615 — An inductive sensing based incremental encoder knob design can provide a robust and low-cost interface for control inputs.  It can reliably operate in environments which have dirt, moisture, or oil which would pose issues for alternate sensing technologies. This solution requires no magnets.
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Inductive Proximity Switch BoosterPack Reference Design
TIDA-00563 — The TIDA-00563 TI Design offers highly integrated complete analog front end (AFE) inductance-to-digital converters (LDCs) optimized for use in industrial proximity sensors for contactless and robust applications such as presence detection and event counting. Inductive sensing technology provides (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Inductive Linear Position Sensing Booster Pack Reference Design
TIDA-00460 — Typical implementations of distance measurements use expensive rare-earth magnets. To lower overall system cost, this reference design walks through the implementation of industry’s first inductance-to-digital converters from TI for linear position sensing without the use of any expensive (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
SC70 (DCK) 5 View options
SOT-23 (DBV) 5 View options

Ordering & quality

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  • Qualification summary
  • Ongoing reliability monitoring

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