L4992 datasheet(1/26 Pages) STMICROELECTRONICS

Il numero della parte	L4992

Spiegazioni elettronici	TRIPLE OUTPUT POWER SUPPLY CONTROLLER

PDF	26 Pages

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Produttore elettronici	STMICROELECTRONICS [STMicroelectronics]

Homepage	http://www.st.com

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L4992

TRIPLE OUTPUT POWER SUPPLY CONTROLLER

DUAL PWM BUCK CONTROLLERS (3.3V

and 5.1V)

12V/120mA LINEAR REGULATOR

DUAL SYNCH RECTIFIERS DRIVERS

96% EFFICIENCY ACHIEVABLE

50

µA (@ 12V) STAND BY CONSUMPTION

5.5V TO 25V SUPPLY VOLTAGE

EXCELLENT LOAD TRANSIENT RESPONSE

DISABLE PULSE SKIPPING FUNCTION

POWER MANAGEMENT:

- UNDER AND OVERVOLTAGE OUTPUT

DETECTION

- POWER GOOD SIGNAL

- SEPARATED DISABLE

THERMAL SHUTDOWN

PACKAGE: TQFP32

APPLICATION

NOTEBOOK AND SUBNOTEBOOK COM-

PUTERS

PEN TOP AND PORTABLE EQUIPMENT

COMMUNICATING COMPUTERS

DESCRIPTION

The L4992 is a sophisticated dual PWM step-

down controller and power monitor intended for

Notebook

computer

and/or

battery

powered

equipment.

The

device

produces

regulated

+3.3V, +5.1V and 12V supplies for use in portable

and PCMCIA applications.

The internal architecture allows to operate with

minimum external components count. A very high

switching frequency (200/300 KHz or externally

synchronizable) optimizes their physical dimen-

sions.

Synchronous rectification and pulse skipping

mode for the buck sections optimise the overall

efficiency over a wide load current range (96% ef-

ficiency

@1A/5.1V

and

93%

efficiency

@

0.05A/5.1V.

The two high performance PWM controllers for

+3.3V and +5.1V lines are monitored for overvol-

tage, undervoltage and overcurrent conditions.

On detection of a fault, a POWER GOOD signal

is generated and a specific shutdown procedure

takes place to prevent physical damage and data

corruption.

A disable function allows to manage the output

power sections separately, optimising the quies-

cent consumption of the IC in stand-by conditions.

June 2000

®

SYNC

POWER

MANAGEMENT

& SYSTEM

SUPERVISOR

5.5V

to

25V

3.3V

5.1V

POWER

SECTION

L4992

µP

MEMORY

PERIPHERALS

12V LDO

5.1V LDO

3.39V REF

D96IN429A

POWER GOOD

SYSTEM BLOCK DIAGRAM

TQFP32

ORDERING NUMBER: L4992

1/26

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