Copyright

© ANPEC Electronics Corp.

Rev. A.2 - Jun., 2013

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.

1.5MHz, 1A Synchronous Buck Regulator

APW7290

Features

General Description

•

1A Output Current

•

Support 4 AA alkaline, NiCd or NiMH batteries

•

Wide 3.5V~7.2V Input Voltage

•

Fixed 1.5MHz Switching Frequency

•

Low Dropout Operating at 100% duty cycle

•

Low 25

µA Quiescent Current

•

Integrate Synchronous Rectifier

•

0.6V Low Reference Voltage

•

<0.5

µA Input Current during Shutdown

•

Current-Mode Operation with Internal

Compensation

- Stable with Ceramic Output Capacitors

- Fast Line Transient Response

•

Short-Circuit Protection

•

Over-Temperature Protection with Hysteresis

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Available in TDFN2x2-8 Package

•

Lead Free and Green Devices Available

(RoHS Compliant)

The APW7290 is a high efficiency monolithic synchro-

nous buck regulator. APW7290 operates with a constant

1.5MHz switching frequency and using the inductor cur-

rent as a controlled quantity in the current mode

architecture. The 3.5V to 7.2V input voltage range makes

the APW7290 ideally suited for single Li-Ion battery pow-

ered applications. 100% duty cycle provides low dropout

operation, extending battery life in portable electrical

devices. The internally fixed 1.5MHz operating frequency

allows the use of small surface mount inductors and

capacitors. The synchronous switches included inside

increase the efficiency and eliminate the need for an ex-

ternal Schottky diode.

The APW7290 is available in TDFN2x2-8 package.

Applications

•

E-Book

•

Toy

•

Portable Instrument

Pin Configuration

TDFN2x2-8

(Top View)

1

6

5

4

3

2

8

7

LBO

VOUT

SW

FB

VIN

LBI

RUN

GND

Simplified Application Circuit

VIN

GND

LBI

1

FB

5

APW7290

SW

3

L1

R2

2

R1

C1

C2

ON

OFF

RUN

4

VOUT

R3

Low Battery

Output

LBO

R4

R5

6

7

8