Copyright

© ANPEC Electronics Corp.

Rev. A.4 - Jun., 2009

APW7079

www.anpec.com.tw

1

ANPEC reserves the right to make changes to improve reliability or manufacturability without notice, and

advise customers to obtain the latest version of relevant information to verify before placing orders.

Low-Supply-Current Synchronous Step-up DC-DC Converter

Features

•

0.9V Typical Start-up Input Voltage

•

11

µA Typical No Load Quiescent Current

•

PFM Operation

•

High Efficiency up to 92%

•

Fixed 1.8V, 2.6V, 2.8V, 3V, 3.3V, 3.8V, 4.5V or 5V

Output Voltage

•

600mA Internal Switch Current

•

Internal Synchronous Rectifier

•

SOT-89 Package

•

Lead Free and Green Devices Available

(RoHS Compliant)

Applications

General Description

The APW7079 is a compact, PFM mode, and step-up

DC-DC converter with low quiescent current. The inter-

nal synchronous rectifier reduces cost and PCB space

by eliminating the need for an external Schottky diode.

Low on-resistance of the internal switches improves the

efficiency up to 92%. The start-up voltage is guaranteed

below 1V. After start-up, the device can operate with input

voltage down to 0.7V. The APW7079 is suitable for por-

table battery-powered applications. Consuming only 11

µA

quiescent current and an optimized control scheme al-

lows the device to operate at very high efficiency over the

entire load current range.

•

Toy

•

Wireless Mouse

•

Portable Instrument

Simplified Application Circuit

Pin Configuration

Top View

LX

VOUT

GND

V

IN

V

OUT

APW7079

L1

22

µH

C2

47

µF

C1

22

µF

I

IN

I

OUT

Output Current, I

Efficiency vs. Output Current

0

10

20

30

40

50

60

70

80

90

100

0.1

1

10

100

1000

V

V

V

V

V

APW7079-30

SOT-89