L5994 Просмотр технического описания (PDF) - STMicroelectronics

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L5994

ADJUSTABLE TRIPLE OUTPUT POWER SUPPLY CONTROLLER

STMicroelectronics 

L5994

L5994A

ADJUSTABLE TRIPLE OUTPUT

POWER SUPPLY CONTROLLER

FEATURE

s DUAL PWM CONTROLLERS ADJUSTABLE

1.9V to 5.3V(Section1)

1.6V to 3.5V(Section2)

s AUXILIARY DRIVER FOR LINEAR

REGULATOR

s CURRENT MODE CONTROL USING A LOW

SENSE RESISTOR

s DUAL SYNC RECTIFIERS DRIVERS

s "ONE SHOT" FEATURE (L5994A only)

s 96% EFFICIENCY ACHIEVABLE

s 50µA@12V STAND BY CONSUMPTION

s 4.75V TO 25V OPERATING SUPPLY VOLTAGE

s EXCELLENT LOAD TRANSIENT RESPONSE

s "PULSE SKIPPING" FUNCTION

s OUTPUT UNDER VOLTAGE SHUTDOWN

s ADAPTATIVE ANTI SHOOT-THROUGH

CONTROL

s OVER/UNDER VOLTAGE DETECTION

s POWER GOOD SIGNALS

s SEPARATED DISABLE

s THERMAL SHUTDOWN

Figure 1. System Block Diagram

TQFP32

ORDERING NUMBERS: L5994

L5994A

APPLICATIONS

s NOTEBOOK AND SUB NOTEBOOK

COMPUTERS

s 1.8V AND 2.5V I/O SUPPLY

s WORDPAD

s INTERNET APPLIANCE

DESCRIPTION

The device provides a dual PWM controller and a

linear driver controller that can support the complete

power management in mobile equipment with high

efficiency.

5V

to

25V

SYNC

L5994

D98IN862

POWER

MANAGEMENT

& SYSTEM

SUPERVISOR

POWER

SECTION

2.5V

1.8V

12V LDO

5.1V LDO

3.39V REF

POWER GOOD

µP

MEMORY

PERIPHERALS

April 2002

1/26

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