lms5258 National Semiconductor Corporation, lms5258 Datasheet

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lms5258

Manufacturer Part Number
lms5258
Description
150ma, ?cap, Low Dropout Voltage Regulator With Power Good
Manufacturer
National Semiconductor Corporation
Datasheet

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© 2003 National Semiconductor Corporation
Pin Description
LMS5258
150mA, µCap, Low Dropout Voltage Regulator with
Power Good
General Description
The LMS5258 is a µCap, precise CMOS voltage regulator
with power good output.
It provides up to 150mA and consumes a typical of 10nA in
shutdown mode. The LMS5258 output stage is designed
with a push pull output for faster transient response.
The LMS5258 is optimized to work with low value, low cost
ceramic capacitors. The output typically require only 1µF of
output capacitance for stability. The enable pin can be tied to
V
The LMS5258 is designed for portable, battery powered
equipment applications with small space requirements.
The LMS5258 is available in a 5-pin SOT-23 package. Per-
formance is specified for the −40˚C to +125˚C temperature
range and is available in a fixed 1.2V. For other output
voltage options, please contact National Semiconductor.
Typical Application
IN
for easy device layout.
Pin Number
1
2
3
4
5
DS200424
Pin Name
V
GND
V
PG
EN
OUT
IN
Features
n Power good indicator
n Stability with low ESR capacitors
n Low ground current: 120µA
n 150mA output current
n "Zero" shutdown mode current
n Fast transient response
n Auto Discharge
n Thermal shutdown
n Current limiting
n TTL-Logic-controlled enable input
n Pin-to-pin replacement for Mic
Applications
n Processor power-up sequencing
n Laptop, notebook and palm top computer
n PCMCIA V
CC
and V
Logic Low = Shutdown
(Do not leave open)
Power Good Output
Logic High = Enabled
Enable Input Logic,
PP
Output Voltage
Pin Function
Input Voltage
regulation switching
20042419
Ground
5258
February 2003
www.national.com

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lms5258 Summary of contents

Page 1

... The LMS5258 output stage is designed with a push pull output for faster transient response. The LMS5258 is optimized to work with low value, low cost ceramic capacitors. The output typically require only 1µF of output capacitance for stability. The enable pin can be tied to V for easy device layout ...

Page 2

... Connection Diagram Ordering Information Package Part Number LMS5258MF-1.2 5-Pin SOT-23 LMS5258MFX-1.2 www.national.com SOT23-5 20042421 Top View Package Marking Transport Media 1k Units Tape and Reel LF9B 3k Units Tape and Reel 2 NSC Drawing MF05A ...

Page 3

Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. ESD Tolerance (Note 2) Human Body Model Junction Temperature OUT EN Soldering Information ...

Page 4

Timing Diagram Block Diagram www.national.com 20042415 20042420 4 ...

Page 5

Typical Performance Characteristics 25˚C and powergood pull up resistor = 47kΩ. Ground Current vs. Output Current Ground Current vs. Temperature Short Circuit Current vs. Input Voltage Unless otherwise specified, V Ground Current vs. Input Voltage 20042401 Short Circuit Current vs. ...

Page 6

Typical Performance Characteristics 25˚C and powergood pull up resistor = 47kΩ. (Continued) Power Good Delay vs. Temperature (V Output Voltage vs. Input Voltage Enable Voltage vs. Input Voltage www.national.com Unless otherwise specified 3.3V) Output Voltage vs. Temperature IN ...

Page 7

Typical Performance Characteristics 25˚C and powergood pull up resistor = 47kΩ. (Continued) Power Good Pull-Up Resistor vs. Power Good PSRR vs. Frequency Unless otherwise specified, V Voltage Noise vs. Frequency 20042416 Power On Reset Delay Time 20042413 7 = 3.3V, ...

Page 8

... Application Notes LMS5258 is a linear regulator designed to be used with a low ESR, low cost ceramic capacitors. EXTERNAL CAPACITORS The LMS5258 regulator requires an output capacitor to maintain stability. The capacitor must be at least 1µF or greater. The capacitor can be low-ESR ceramic chip capaci- tor, however for improved capacitance over temperature, tantalum capacitors can be used. A 1µ ...

Page 9

... NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant ...

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