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L6925D

HIGH EFFICIENCY MONOLITHIC SYNCHRONOUS

STEP DOWN REGULATOR

s

s

s

s

s

s

s

s

s

s

s

s

s

s

s

s

s

2.7V TO 5.5V BATTERY INPUT RANGE

HIGH EFFICIENCY: UP TO 95%

INTERNAL SYNCHRONOUS SWITCH

NO EXTERNAL SCHOTTKY REQUIRED

EXTREMELY LOW QUIESCENT CURRENT

800mA MAX OUTPUT CURRENT

ADJUSTABLE OUTPUT VOLTAGE FROM 0.6V

LOW DROP-OUT OPERATION: UP TO100%

DUTY CYCLE

SELECTABLE LOW NOISE/LOW

CONSUMPTION MODE AT LIGHT LOAD

LOW BATTERY INPUT

LOW BATTERY OUTPUT

鹵1% OUTPUT VOLTAGE ACCURACY

CURRENT-MODE CONTROL

600kHz SWITCHING FREQUENCY

EXTERNALLY SYNCHRONIZABLE FROM

500kHz TO 1.4MHz

OVP

SHORT CIRCUIT PROTECTION

MSOP8

ORDERING NUMBERS:

L6925D (Tube)

L6925013TR (Tape & Reel)

DESCRIPTION

The device is dc-dc monolithic regulator specifically

designed to provide extremely high efficiency.

The device has on UVLO set at 2.7V cause it is part-

icurarly thought for single Li-ion cell applications.

Output voltage can be selected by an external divider

down to 0.6V. Duty Cycle can saturate to 100% al-

lowing low drop-out operation. The device is based

on a 600kHz fixed-frequency, current mode-architec-

ture. Low Consumption Mode operation can be se-

lected at light load conditions, allowing switching

losses to be reduced. L6925D is externally synchro-

nizable with a clock which makes it useful in noise-

sensitive applications. LBI pin can be used to have a

LBO signal when the Battery voltage is lower than a

preset value. Other features like, Overvoltage protec-

tion, Shortcircuit protection and Thermal Shutdown

(150擄C) are also present.

APPLICATIONS

s

BATTERY-POWERED EQUIPMENTS

s

PORTABLE INSTRUMENTS

s

CELLULAR PHONES

s

PDAs AND HAND HELD TERMINALS

s

DSC

s

GPS

APPLICATION TEST CIRCUIT

V

IN

=2.7V to 5.5V

C1

10碌F

6.3V

R2

600K

R1

100K

SYNC

V

CC

LBI

7

6

1

8

COMP

L 6.8碌H

5

LX

R4

200K

V

OUT

=1.8V

C4

10碌F

6.3V

3

2

C2

220pF

4

GND

VFB

R3

100K

LBO

D01IN1238B

September 2003

1/5

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