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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

50碌A(chǔ)@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

s

s

1.8V AND 2.5V I/O SUPPLY

WORDPAD

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.

2.5V

5V

to

25V

L5994

POWER

SECTION

1.8V

SYNC

12V LDO

5.1V LDO

POWER

MANAGEMENT

& SYSTEM

SUPERVISOR

3.39V REF

POWER GOOD

碌P

MEMORY

PERIPHERALS

D98IN862

April 2002

1/26

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