L6920 Datasheet

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L6920

1V HIGH EFFICIENCY SYNCRONOUS STEP UP CONVERTER

s

s

s

s

s

s

s

s

0.6 TO 5.5V OPERATING INPUT VOLTAGE

1V START UP INPUT VOLTAGE

INTERNAL SYNCHRONOUS RECTIFIER

ZERO SHUT DOWN CURRENT

3.3V AND 5V FIXED OR ADJUSTABLE

OUTPUT VOLTAGE (2V UP TO 5.2V)

120m鈩?INTERNAL ACTIVE SWITCH

LOW BATTERY VOLTAGE DETECTION

REVERSE BATTERY PROTECTION

TSSOP8

ORDERING NUMBER: L6920D

Applications

s

ONE TO THREE CELL BATTERY DEVICES

s

s

DESCRIPTION

The L6920 is a high efficiency step-up controller re-

quiring only three external components to realize the

conversion from the battery voltage to the selected

output voltage.

The start up is guaranteed at 1V and the device is op-

erating down to 0.6V.

Internal synchronous rectifier is implemented with a

120m鈩?P-channel MOSFET and, in order to improve

the efficiency, a variable frequency control is imple-

mented.

PDA AND HAND HELD INSTRUMENTS

CELLULAR PHONES - DIGITAL CORDLESS

PHONE

PAGERS

GPS

DIGITAL CAMERAS

s

s

s

APPLICATION CIRCUIT

L1

V

CC

2.5V

C2

LX

7

8

1

OUT

FB

C3

V

OUT

3.3V

500mA

C1

SHDN

LBI

REF

5

2

4

L6920

3

6

LBO

GND

D00IN1136C

May 2003

1/12

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