Copyright

© ANPEC Electronics Corp.

Rev. A.1 - Jan., 2012

APW7089

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.

4A, 26V, 380kHz, Asynchronous Step-Down Converter

Features

•

Wide Input Voltage from 4.5V to 26V

•

Output Current up to 4A

•

Adjustable Output Voltage from 0.8V to 90% V

IN

- 0.8V Reference Voltage

-

±2.5% System Accuracy

•

80m

Ω Integrated P-Channel Power MOSFET

•

High Efficiency up to 91%

- Pulse-Skipping Mode (PSM) / PWM Mode Op-

eration

•

Current-Mode Operation

- Stable with Ceramic Output Capacitors

- Fast Transient Response

•

Power-On-Reset Monitoring

•

Fixed 380kHz Switching Frequency in PWM Mode

•

Built-in Digital Soft-Start

•

Output Current-Limit Protection with Frequency

Foldback

•

70% Under-Voltage Protection

•

Over-Temperature Protection

•

<5

µA Quiescent Current During Shutdown

•

Thermal-Enhanced SOP-8P Package

•

Lead Free and Green Devices Available

(RoHS Compliant)

Applications

General Description

The APW7089 is a 4A, asynchronous, step-down con-

verter with integrated 80m

Ω P-channel MOSFET. The

device, with current-mode control scheme, can convert

4.5~26V input voltage to the output voltage adjustable

from 0.8 to 90% V

regulation.

The APW7089 regulates the output voltage in automatic

PSM/PWM mode operation, depending on the output

current, for high efficiency operation over light to full load

current. The APW7089 is also equipped with power-on-

reset, soft-start, and whole protections (under-voltage,

over-temperature, and current-limit) into a single package.

In shutdown mode, the supply current drops below 5

µA.

This device, available in a 8-pin SOP-8P package, pro-

vides a very compact system solution with minimal exter-

nal components and good thermal conductance.

•

LCD Monitor / TV

•

Set-Top Box

•

Portable DVD

•

Wireless LAN

•

ADSL, Switch HUB

•

Notebook Computer

•

Step-Down Converters Requiring High Efficiency

and 4A Output Current

Output Current, I

10

20

30

40

50

60

70

80

90

100

0.001

0.01

0.1

1

10

V

V