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L6995

December 2002

FEATURE

s

CONSTANT ON TIME TOPOLOGY ALLOWS

OPERATION WITH LOWER DUTY THAN

PWM TOPOLOGY

s

VERY FAST LOAD TRANSIENTS

s

s

1.5V TO 28V INPUT VOLTAGE RANGE

s

s

MINIMUM OUTPUT VOLTAGE AS LOW AS 0.9V

s

SELECTABLE SINKING MODE

s

LOSSLESS CURRENT LIMIT

s

REMOTE SENSING

s

OVP,UVP LATCHED PROTECTIONS

s

600

µA TYP QUIESCENT CURRENT

s

POWER GOOD AND OVP SIGNALS

s

PULSE SKIPPING AT LIGHT LOADS

APPLICATIONS

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I/O BUS FOR CPU CORE SUPPLY

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NOTEBOOK COMPUTERS

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NETWORKING DC-DC

s

DISTRIBUTED POWER

DESCRIPTION

The device is a step-down controller specifically de-

signed to provide extremely high efficiency conver-

sion, with losses current sensing tecnique.

The "constant on-time" topology assures fast load

transient response. The embedded "voltage feed-for-

ward" provides nearly constant switching frequency

operation.

An integrator can be introduced in the control loop to

reduce the static output voltage error.

The available remote sensing improve the static and

dynamic regulation recovering the wires voltage

drop. Pulse skipping technique reduces power con-

sumption at light load. Drivers current capability al-

lows output current in excess of 20A.

TSSOP20

ORDERING NUMBERS: L6995D

L6995DTR

STEP DOWN CONTROLLER FOR HIGH DIFFERENTIAL

INPUT-OUTPUT CONVERSION

This is preliminary information on a new product now in development. Details are subject to change without notice.

MINIMUM COMPONENT COUNT APPLICATION

SS

C

C

BOOT

OUT

C

0.9V

Vo

L6995

28V

Rin2

Rin1

CIN

RILIM

5V

INT

VFB

SS

OSC

BOOT

HGATE

PHASE

LGATE

PGND

GND

NOSKIP

ILIM

VSENSE

VREF

5V

VREF

C

L

BOOT

D

HS

LS

DS