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LP2954 Datasheet

5-V and Adjustable Micropower LDOs

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LP2954, LP2954A
SNVS096E – JUNE 1999 – REVISED JULY 2016
LP2954, LP2954A 5-V and Adjustable Micropower LDOs
1 Features
1 5-V Output within 1.2% Over Temperature
(A Grade)
• Adjustable 1.23-V to 29-V Output Voltage
Available (LP2954IM and LP2954AIM)
• Ensured 250-mA Output Current
• Extremely Low Quiescent Current
• Low Dropout Voltage
• Reverse Battery Protection
• Extremely Tight Line and Load Regulation
• Very Low Temperature Coefficient
• Current and Thermal Limiting
• Pin Compatible with LM2940 and LM340
(5-V Version Only)
• Adjustable Version Adds ERROR Flag to Warn of
Output Drop and a Logic-Controlled Shutdown
2 Applications
• High-Efficiency Linear Regulator
• Low Dropout Battery-Powered Regulator
3 Description
The LP2954 is a 5-V micropower LDO with very low
quiescent current (90 μA typical at 1-mA load) and
very low dropout voltage (typically 60 mV at light
loads and 470 mV at 250-mA load current).
The quiescent current increases only slightly at
dropout (120 μA typical), which prolongs battery life.
The LP2954 with a fixed 5-V output is available in
three-pin TO-220 and DDPAK/TO-263 packages. The
adjustable LP2954 is provided in an 8-pin, small-
outline SOIC package. The adjustable version also
provides a resistor network which can be pin
strapped to set the output to any voltage from to
1.23 V to 29 V.
Reverse battery protection is provided for the IN pin.
The tight line and load regulation (0.04% typical), as
well as very low output temperature coefficient make
the LP2954 well suited for use as a low-power
voltage reference.
Output accuracy is ensured at both room temperature
and over the entire operating temperature range.
Device Information(1)
PART NUMBER PACKAGE
BODY SIZE (NOM)
SOIC (8)
4.90 mm × 3.91 mm
LP2954
DDPAK/TO-263 (3) 10.18 mm × 8.41 mm
TO-220 (3)
14.986 mm × 10.16 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Simplified Schematic
VIN
IN
OUT
VOUT
GND
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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LP2954 Datasheet Preview

LP2954 Datasheet

5-V and Adjustable Micropower LDOs

No Preview Available !

LP2954, LP2954A
SNVS096E – JUNE 1999 – REVISED JULY 2016
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 .................................................. 4
6.5 Electrical Characteristics........................................... 5
6.6 Typical Characteristics .............................................. 7
7 Detailed Description ............................................ 10
7.1 Overview ................................................................. 10
7.2 Functional Block Diagrams ..................................... 10
7.3 Feature Description................................................. 11
7.4 Device Functional Modes........................................ 12
8 Application and Implementation ........................ 13
8.1 Application Information............................................ 13
8.2 Typical Application ................................................. 13
9 Power Supply Recommendations...................... 17
10 Layout................................................................... 18
10.1 Layout Guidelines ................................................. 18
10.2 Layout Example .................................................... 18
11 Device and Documentation Support ................. 19
11.1 Related Documentation ....................................... 19
11.2 Related Links ........................................................ 19
11.3 Receiving Notification of Documentation Updates 19
11.4 Community Resources.......................................... 19
11.5 Trademarks ........................................................... 19
11.6 Electrostatic Discharge Caution ............................ 19
11.7 Glossary ................................................................ 19
12 Mechanical, Packaging, and Orderable
Information ........................................................... 20
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision D (March 2013) to Revision E
Page
• Changed "voltage regulator" to "LDO".................................................................................................................................... 1
• Added Device Information and Pin Configuration and Functions sections, ESD Ratings and Thermal Information
tables, Feature Description, Device Functional Modes, Application and Implementation, Power Supply
Recommendations, Layout, Device and Documentation Support, and Mechanical, Packaging, and Orderable
Information sections; added top nav icon for TI Designs ....................................................................................................... 1
• Changed RθJA value for DDPAK/TO-263 from "73°C/W" to "44.3°C/W"; TO-220 from "60°C/W" to "80.3°C/W"; SOIC
from "160°C/W" to "105.0°C/W". These values were in former FN 3 to Abs Max table......................................................... 4
• Added Power Dissipation ..................................................................................................................................................... 15
• Added Estimating Junction Temperature ............................................................................................................................. 15
Changes from Revision C (March 2013) to Revision D
Page
• Changed layout of National Semiconductor data sheet to TI format.................................................................................... 18
2
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Copyright © 1999–2016, Texas Instruments Incorporated
Product Folder Links: LP2954 LP2954A


Part Number LP2954
Description 5-V and Adjustable Micropower LDOs
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