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LP2953 Datasheet

Adjustable Micropower Low-Dropout Voltage Regulators

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LP2952-N, LP2952A, LP2953, LP2953A
SNVS095F – MAY 2004 – REVISED MARCH 2015
LP295x Adjustable Micropower Low-Dropout Voltage Regulators
1 Features
1 2.3-V to 30-V Input Voltage Range
• Output Voltage Adjusts from 1.23 V to 29 V
• 250-mA Output Current
• Extremely Low Quiescent Current
• Low Dropout Voltage
• Extremely Tight Line and Load Regulation
• Very Low Temperature Coefficient
• Current and Thermal Limiting
• Reverse Battery-Input Protection
• 50-mA (Typical) Automatic Output Discharge
• LP2953 Versions Only
– Auxiliary Comparator Included With CMOS-
and TTL-Compatible Output Levels. Can Be
Used for Fault Detection, Low-Input Line
Detection, and so on.
2 Applications
• High-Efficiency Linear Regulator
• Regulator With Undervoltage Shutdown
• Low-Dropout Battery-Powered Regulator
• Snap-ON/Snap-OFF Regulator
3 Description
The LP2952 and LP2953 are micropower voltage
regulators with very low quiescent current (130 μA
typical at 1-mA load) and very low dropout voltage
(typically 60 mV at light load and 470 mV at 250-mA
load current). They are ideally suited for battery-
powered systems. Furthermore, the quiescent current
increases only slightly at dropout, which prolongs
battery life.
The LP2952 and LP2953 retain all the desirable
characteristics of the LP2951, but offer increased
output current, additional features, and an improved
shutdown function.
The automatic output discharge pulls the output down
quickly when the shutdown is activated.
The error flag goes low if the output voltage drops out
of regulation.
Reverse battery-input protection is provided.
The internal voltage reference is made available for
external use, providing a low temperature coefficient
(20 ppm/°C) reference with very good line (0.03%)
and load (0.04%) regulation.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LP2952x
SOIC (16)
9.90 mm × 3.91 mm
LP2953x
SOIC (16)
PDIP (16)
9.90 mm × 3.91 mm
21.755 mm × 6.35 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Typical Application Schematic
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.




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LP2953 Datasheet Preview

LP2953 Datasheet

Adjustable Micropower Low-Dropout Voltage Regulators

No Preview Available !

LP2952-N, LP2952A, LP2953, LP2953A
SNVS095F – MAY 2004 – REVISED MARCH 2015
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Pin Configuration and Functions ......................... 3
6 Specifications......................................................... 4
6.1 Absolute Maximum Ratings ...................................... 4
6.2 ESD Ratings.............................................................. 4
6.3 Recommended Operating Conditions....................... 4
6.4 Thermal Information .................................................. 5
6.5 Electrical Characteristics: 3.3-V Versions ................. 5
6.6 Electrical Characteristics: 5-V Versions .................... 5
6.7 Electrical Characteristics: All Voltage Options .......... 6
6.8 Typical Characteristics .............................................. 9
7 Detailed Description ............................................ 14
7.1 Overview ................................................................. 14
7.2 Functional Block Diagrams ..................................... 14
7.3 Feature Description................................................. 15
7.4 Device Functional Mode ......................................... 16
8 Application and Implementation ........................ 17
8.1 Application Information............................................ 17
8.2 Typical Applications ................................................ 21
9 Power Supply Recommendations...................... 30
10 Layout................................................................... 31
10.1 Layout Guidelines ................................................. 31
10.2 Layout Example .................................................... 31
10.3 Power Dissipation: Heatsink Requirements
(Industrial Temperature Range Devices) ................. 32
11 Device and Documentation Support ................. 34
11.1 Related Links ........................................................ 34
11.2 Trademarks ........................................................... 34
11.3 Electrostatic Discharge Caution ............................ 34
11.4 Glossary ................................................................ 34
12 Mechanical, Packaging, and Orderable
Information ........................................................... 34
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision E (December 2014) to Revision F
Page
• Deleted "Assured" .................................................................................................................................................................. 1
• Changed "Output Pulldown Crowbar" to "Automatic Output Discharge" ............................................................................... 1
• Changed "internal crowbar" to "automatic output discharge" ................................................................................................. 1
• Added word "input" after "battery" in Features and Description ............................................................................................. 1
• Changed pin names for IN and OUT to match TI nomenclature; fix typos ............................................................................ 1
• Changed max junc. temp from 125°C to 150°C .................................................................................................................... 4
• Changed wording of footnote 12 ........................................................................................................................................... 8
• Added second bullet for "LP2953 versions only" ................................................................................................................. 14
• Added Automatic Output Dischange subsection ................................................................................................................. 16
• Deleted sentence "To achieve the smallest form factor, the TO-92 package is selected.".................................................. 22
• Changed "With an efficiency of 83.3% and a 250-mA maximum load, the internal power dissipation is 250 mW,
which corresponds to a 19.2°C junction temperature rise for the SOIC package." to "With a VIN – VOUT differential of
1 V and a maximum load current of 250 mA the internal junction temperature (TJ) of the SOIC package will rise
19.2° above the ambient temperature."................................................................................................................................ 22
• Deleted "Thermal Resistance for Various Copper Heatsinking Patterns" table ................................................................... 33
Changes from Revision D (September 2013) to Revision E
Page
• Added Pin Configuration and Functions section, ESD Ratings table, Feature Description section, Device Functional
Modes, Application and Implementation section, Power Supply Recommendations section, Layout section, Device
and Documentation Support section, and Mechanical, Packaging, and Orderable Information section; updated
Thermal Information values; deleted obsolete LP2953AM references .................................................................................. 1
Changes from Revision C (March 2005) to Revision D
Page
• Changed layout of National Data Sheet to TI format ........................................................................................................... 30
2
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Copyright © 2004–2015, Texas Instruments Incorporated
Product Folder Links: LP2952-N LP2952A LP2953 LP2953A


Part Number LP2953
Description Adjustable Micropower Low-Dropout Voltage Regulators
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