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L6910

L6910A

ADJUSTABLE STEP DOWN CONTROLLER

WITH SYNCHRONOUS RECTIFICATION

FEATURE

s

OPERATING SUPPLY VOLTAGE FROM 5V

TO 12V BUSES

s

UP TO 1.3A GATE CURRENT CAPABILITY

s

ADJUSTABLE OUTPUT VOLTAGE

s

N-INVERTING E/A INPUT AVAILABLE

s

0.9V 鹵1.5% VOLTAGE REFERENCE

s

VOLTAGE MODE PWM CONTROL

s

VERY FAST LOAD TRANSIENT RESPONSE

s

0% TO 100% DUTY CYCLE

s

POWER GOOD OUTPUT

s

OVERVOLTAGE PROTECTION

s

HICCUP OVERCURRENT PROTECTION

s

200kHz INTERNAL OSCILLATOR

s

OSCILLATOR EXTERNALLY ADJUSTABLE

FROM 50kHz TO 1MHz

s

SOFT START AND INHIBIT

s

PACKAGES: SO-16 & HTSSOP16

APPLICATIONS

s

SUPPLY FOR MEMORIES AND TERMI-

NATIONS

s

COMPUTER ADD-ON CARDS

s

LOW VOLTAGE DISTRIBUTED DC-DC

s

MAG-AMP REPLACEMENT

SO-16 (Narrow)

HTSSOP16 (Exposed Pad)

ORDERING NUMBERS:

L6910

(SO-16)

L6910A

(HTSSOP16)

L6910TR (Tape & Reel) L6910ATR (Tape & Reel)

DESCRIPTION

The device is a pwm controller for high performance

dc-dc conversion from 3.3V, 5V and 12V buses.

The output voltage is adjustable down to 0.9V; higher

voltages can be obtained with an external voltage di-

vider.

High peak current gate drivers provide for fast switch-

ing to the external power section, and the output

current can be in excess of 20A.

The device assures protections against load overcur-

rent and overvoltage. An internal crowbar is also pro-

vided turning on the low side mosfet as long as the

over-voltage is detected. In case of over-current de-

tection, the soft start capacitor is discharged and the

system works in HICCUP mode.

BLOCK DIAGRAM

Vin 5V to12V

PGOOD

VCC

OCSET

BOOT

VREF

SS

Monitor

Protection and Ref

UGATE

OSC

PHASE

OSC

Vo

R

T

L6910

-

EAREF

+

-

LGATE

PGND

E/A

+

PWM

GND

300k

VFB

COMP

July 2003

1/21

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