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LP2951 Voltage Regulator: Application, Circuit, Pinout

Author: Iggy Date: 7 Apr 2021  120

What is LP2951?

The LP2951 is a bipolar, low-dropout voltage regulator. The LP2951 regulator is usually used in applications that require a preset output voltage, which can be easily configured using two resistors. This device can provide low dropout regulation in a wide range of output voltage ranging from 1.235V to 30V. Therefore, it has become a popular choice for microcircuits that require micropower regulators that can provide up to 100 mA load current.

This blog provides you with a basic overview of the LP2951 voltage regulator, including its pin descriptions, functions and specifications, alternative products, etc., to help you quickly understand what LP2951 is.

Catalog

LP2951 Pinout

LP2951 Circuit

LP2951 Applications

LP2951 Features

LP2951 CAD/CAE symbols

LP2951 Functional Block Diagram

LP2951 Advantage

LP2951 Package

LP2951 Specification

LP2951 Manufacturer

LP2951 Documents

Where to use LP2951

Component Datasheet

LP2951 Pinout

LP2951 Voltage Regulator

Pin NAME

Pin Number

TYPE

DESCRIPTION

ERROR

5

O

Active-low open-collector error output. Goes low when VOUT drops by 6% of its nominal value.

FEEDBACK

7

I

Determines the output voltage. Connect to VTAP (with OUTPUT tied to SENSE) to output the fixed voltage corresponding to the part version, or connect to a resistor divider to adjust the output voltage.

GND

4

Ground

INPUT

8

I

Supply input

OUTPUT

1

O

Voltage output.

SENSE

2

I

Senses the output voltage. Connect to OUTPUT (with FEEDBACK tied to VTAP) to output the voltage corresponding to the part version.

SHUTDOWN

3

I

Active-high input. Shuts down the device.

VTAP

6

O

Tie to FEEDBACK to output the fixed voltage corresponding to the part version.


LP2951 Circuit

  • LP2951 Circuit 1:12-V to 5-V Converter

LP2951 Circuit: 12-V to 5-V Converter

  • LP2951 Circuit 2

LP2951 Circuit

  • LP2951 Circuit 3

LP2951 Circuit

  • LP2951 Circuit 4: Regulator with Early Warning and Auxiliary Output

LP2951 Circuit: Regulator with Early Warning and Auxiliary Output


LP2951 Applications

  • Applications with High-Voltage Input
  • Power Supplies

LP2951 Features

  • Wide Input Range: Up to 30 V
  • Rated Output Current of 100 mA
  • Low Dropout: 380 mV (Typ) at 100 mA
  • Low Quiescent Current: 75 µA (Typ)
  • Tight Line Regulation: 0.03% (Typ)
  • Tight Load Regulation: 0.04% (Typ)
  • High VO Accuracy
    • 1.4% at 25°C
    • 2% Over Temperature
  • Can Be Used as a Regulator or Reference
  • Stable With Low ESR (>12 mΩ) Capacitors
  • Current- and Thermal-Limiting Features
  • LP2950 Only (3-Pin)
    • Fixed-Output Voltages of 5 V, 3.3 V, and 3 V
  • LP2951 Only (8-Pin Package)
    • Fixed- or Adjustable-Output Voltages:
    • 5 V/ADJ, 3.3 V/ADJ, and 3 V/ADJ
    • Low-Voltage Error Signal on Falling Output
    • Shutdown Capability
    • Remote Sense Capability for Optimal Output
    • Regulation and Accuracy

LP2951 CAD/CAE symbols

Package

Pins

Download

SOIC (D)

8

View options

SON (DRG)

8

View options


LP2951 Functional Block Diagram

LP2951 Functional Block Diagram


LP2951 Advantage

LP2951 voltage regulator

LP2951 voltage regulator

The LP2950 and LP2951 devices are bipolar, low-dropout voltage regulators that can accommodate a wide input supply-voltage range of up to 30 V. The easy-to-use, 3-pin LP2950 is available in fixed-output voltages of 5 V, 3.3 V, and 3 V. However, the 8-pin LP2951 device is able to output either a fixed or adjustable output from the same device. By tying the OUTPUT and SENSE pins together, and the FEEDBACK and VTAP pins together, the LP2951 device outputs a fixed 5 V, 3.3 V, or 3 V (depending on the version).

Alternatively, by leaving the SENSE and VTAP pins open and connecting FEEDBACK to an external resistor divider, the output can be set to any value between 1.235 V to 30 V. The 8-pin LP2951 device also offers additional functionality that makes it particularly suitable for battery-powered applications. For example, a logic-compatible shutdown feature allows the regulator to be put in standby mode for power savings. In addition, there is a built-in supervisor reset function in which the ERROR output goes low when VOUT drops by 6% of its nominal value for whatever reasons – due to a drop in VIN, current limiting, or thermal shutdown.

The LP2950 and LP2951 devices are designed to minimize all error contributions to the output voltage. With a tight output tolerance (0.5% at 25°C), a very low output voltage temperature coefficient (20 ppm typical), extremely good line and load regulation (0.3% and 0.4% typical), and remote sensing capability, the parts can be used as either low-power voltage references or 100-mA regulators.


LP2951 Package

PART NUMBER

PACKAGE

BODY SIZE (NOM)

LP2951

SOIC (8)

4.90 mm x 3.90 mm

SON (8)

3.00 mm x 3.00 mm


LP2951 Specification

Output options Adjustable Output, Fixed Output
Iout (Max) (A) 0.1
Vin (Max) (V) 30
Vin (Min) (V) 2
Vout (Max) (V) 29
Vout (Min) (V) 1.2
Fixed output options (V) 3, 3.3, 5
Noise (uVrms) 160
Iq (Typ) (mA) 0.075
Thermal resistance θJA (°C/W) 52
Load capacitance (Min) (µF) 1
Rating Catalog
Regulated outputs (#) 1
Features Enable, Power Good
Accuracy (%) 3
PSRR @ 100 KHz (dB) 57
Dropout voltage (Vdo) (Typ) (mV) 380
Operating temperature range (C) -40 to 125

LP2951 Manufacturer

TI Logo

Texas Instruments Inc. (TI)  is an American technology company that designs and manufactures semiconductors and various integrated circuits, which it sells to electronics designers and manufacturers globally. Its headquarters are in Dallas, Texas, United States. TI is one of the top ten semiconductor companies worldwide, based on sales volume. Texas Instruments's focus is on developing analog chips and embedded processors, which accounts for more than 80% of their revenue. TI also produces TI digital light processing (DLP) technology and education technology products including calculators, microcontrollers and multi-core processors. To date, TI has more than 43,000 patents worldwide.


LP2951 Documents

User guide

LP2951 EVM User's Guide (Rev. A)

Application note

ESR, Stability, and the LDO Regulator (Rev. A)

Technical article

LDO basics: capacitor vs. capacitance

 


Where to use LP2951

Both LP2950 and LP2951 feature low quiescent current and low dropout voltage (typical 50mV at light load and 380mV at 100mA). These devices are an excellent choice for use in battery powered application such as cordless telephones, radio control systems and portable computers.


Component Datasheet

LP2951 Datasheet


Ordering & Quality

Photo Mfr. Part # Company Description Package PDF Qty Pricing
(USD)
LP2951-02YM LP2951-02YM Company:Microchip Technology Remark:IC REG LIN POS ADJ 100MA 8SOIC Package:8-SOIC (0.154", 3.90mm Width)
DataSheet
In Stock:798
Inquiry
Price:
1+: $0.92000
25+: $0.77000
100+: $0.70000
Inquiry
LP2951-02YM-TR LP2951-02YM-TR Company:Microchip Technology Remark:IC REG LIN POS ADJ 100MA 8SOIC Package:8-SOIC (0.154", 3.90mm Width)
DataSheet
In Stock:On Order
Inquiry
Price:
2500+: $0.70000
Inquiry
LP2951-02YN LP2951-02YN Company:Microchip Technology Remark:IC REG LIN POS ADJ 100MA 8DIP Package:8-DIP (0.300", 7.62mm)
N/A
In Stock:On Order
Inquiry
Price:
600+: $0.88000
Inquiry
LP2951-03YM LP2951-03YM Company:Microchip Technology Remark:IC REG LIN POS ADJ 100MA 8SOIC Package:8-SOIC (0.154", 3.90mm Width)
DataSheet
In Stock:280
Inquiry
Price:
1+: $0.84000
25+: $0.70000
100+: $0.64000
Inquiry
LP2951-03YM-TR LP2951-03YM-TR Company:Microchip Technology Remark:IC REG LIN POS ADJ 100MA 8SOIC Package:8-SOIC (0.154", 3.90mm Width)
DataSheet
In Stock:335
Inquiry
Price:
2500+: $0.64000
1+: $0.84000
25+: $0.70000
100+: $0.64000
Inquiry
LP2951-50DRGR LP2951-50DRGR Company:Texas Instruments Remark:IC REG LINEAR POS ADJ 100MA 8SON Package:8-WFDFN Exposed Pad
DataSheet
In Stock:18000
Inquiry
Price:
3000+: $0.20925
6000+: $0.20150
15000+: $0.19375
30000+: $0.19065
75000+: $0.18600
Inquiry
LP2951ACDG LP2951ACDG Company:Rochester Electronics, LLC Remark:ADJUSTABLE LDO REGULATOR Package:8-SOIC (0.154", 3.90mm Width)
DataSheet
In Stock:On Order
Inquiry
Price:
Call
Inquiry
LP2951ACDR2G LP2951ACDR2G Company:ON Semiconductor Remark:IC REG LIN POS ADJ 100MA 8SOIC Package:8-SOIC (0.154", 3.90mm Width)
DataSheet
In Stock:On Order
Inquiry
Price:
2500+: $0.17313
5000+: $0.16119
Inquiry
LP2951ACMX-NOPB LP2951ACMX-NOPB Company:Texas Instruments Remark:IC REG LIN POS ADJ 100MA 8SOIC Package:8-SOIC (0.154", 3.90mm Width)
DataSheet
In Stock:67500
Inquiry
Price:
2500+: $0.33915
5000+: $0.32640
12500+: $0.31620
25000+: $0.30600
Inquiry
LP2951ACN-NOPB LP2951ACN-NOPB Company:Texas Instruments Remark:IC REG LIN POS ADJ 100MA 8DIP Package:8-DIP (0.300", 7.62mm)
DataSheet
In Stock:2801
Inquiry
Price:
1+: $1.24000
10+: $1.11200
25+: $1.05560
100+: $0.81060
250+: $0.71632
500+: $0.67860
1000+: $0.52780
2500+: $0.50141
5000+: $0.48256
Inquiry

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