L6928(2006) データシートの表示（PDF） - STMicroelectronics

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L6928
(Rev.:2006)

High efficiency monolithic synchronous step down regulator

STMicroelectronics 

L6928

High efficiency monolithic synchronous step down regulator

General features

■ 2V to 5.5V battery input range

■ High efficiency: up to 95%

■ Internal synchronous switch

■ No external schottky required

■ Extremely low quiescent current

■ 1µA max shutdown supply current

■ 800mA max output current

■ Adjustable output voltage from 0.6V

■ Low drop-out operation: up to 100% duty cycle

■ Selectable low noise/low consumption mode at

light load

■ Power good signal

■ ±1% output voltage accuracy

■ Current-mode control

■ 1.4MHz switching frequency

■ Externally synchronizable

from 1MHz to 2MHz

■ OVP

■ Short circuit protection

Applications

■ Battery-powered equipments

■ Portable instruments

■ Cellular phones

■ PDAs and hand held terminals

■ DSC

■ GPS

Application test circuit

MSOP8

VFQFPN8

Description

The device is dc-dc monolithic regulator

specifically designed to provide extremely high

efficiency.

L6928 supply voltage can be as low as 2V

allowing its use in single Li-ion cell supplied

applications. Output voltage can be selected by

an external divider down to 0.6V. Duty Cycle can

saturate to 100% allowing low drop-out operation.

The device is based on a 1.4MHz fixed-frequency,

current mode-architecture.

Low Consumption Mode operation can be

selected at light load conditions, allowing

switching losses to be reduced. L6928 is

externally synchronizable with a clock which

makes it useful in noise-sensitive applications.

Other features like Powergood, Overvoltage

protection, Shortcircuit protection and Thermal

Shutdown (150°C) are also present.

October 2006

VIN=2V to 5.5V

C1

10µF

6.3V

SYNC

7

VCC

6

RUN

1

2

COMP

D01IN1528

C2

220pF

L 4.7µH

5

LX

R3

500K

8

PGOOD

3

4

VFB

GND

Rev 4

R2

200K

R1

100K

VOUT=1.8V

C4

10µF

6.3V

1/16

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