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L6996

DINAMICALLY PROGRAMMABLE SYNCHRONOUS

STEP DOWN CONTROLLER FOR MOBILE CPUs

s

s

s

s

s

s

s

s

s

s

s

s

s

s

5 BIT DAC WITH AVAILABLE EXTERNAL

OUTPUT VOLTAGE.

0.6 TO 1.750V, DYNAMICALLY ADJUSTABLE

OUTPUT VOLTAGE RANGE.

鹵1% OUTPUT ACCURACY OVER LINE AND LOAD.

ACTIVE DROOP.

CONSTANT ON TIME TOPOLOGY ALLOWS

LOW DUTY CYCLE AND FAST LOAD

TRANSIENT.

90% EFFICIENCY FROM 12V TO 1.35V/8A.

1.750V TO 28V BATTERY INPUT RANGE.

OPERATING FREQUENCY UP TO 1MHZ.

INTEGRATED HIGH CURRENT DRIVERS.

LATCHED OVP AND UVP PROTECTIONS.

OCP PROTECTION.

350碌A TYP. QUIESCENT CURRENT.

7碌A TYP. SHUTDOWN SUPPLY CURRENT.

PGOOD AND OVP SIGNALS.

ZERO-CURRENT DETECTION AND PULSE-

FREQUENCY MODE.

TSSOP24

ORDERING NUMBERS: L6996D (TSSOP24)

L6996DTR (Tape & Reel)

APPLICATIONS

s

ADVANCED MOBILE CPUs SUPPLY WITH

DYNAMIC TRANSITIONS.

s

NOTEBOOK/LAPTOP, CONCEPT PC CPUs

SUPPLY.

s

DC/DC FROM BATTERY SUPPLY EQUIPMENTS.

APPLICATION DIAGRAM

5V

DESCRIPTION

The device is dc-dc controller specifically designed to

provide extremely high efficiency conversion for mo-

bile advanced microprocessors.

The "constant on-time" topology assures fast load

transient response. The embedded "voltage feedfor-

ward" provides nearly constant switching frequency

operation.

A precise 5-bit DAC allows select output voltage from

0.6V to 1V with 25mV steps and from 1V to 1.75V

with 50mV steps.

L6996 is capable of supporting CPUs VID combina-

tion changing during normal operation.

The active droop allows adjust both the output load-

line slope and the zero-load output voltage.

25V

VCC

VDR

OSC

BOOT

HGATE

HS

5V

L

PHASE

PGOOD

OVP

R

SENSE

V

OUT

1.25V

L6996

LGATE

LS

DS

ILIM

PGND

GND

CS+

CS-

SS

VFB-

VFB+

C

SS

SHDN

VID4:0

VPROG

C

VPROG

July 2002

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