Copyright

© ANPEC Electronics Corp.

Rev. A.6 - Jun., 2008

APW7080

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 Operation

•

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% Undervoltage 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 APW7080 is a 4A, asynchronous, step-down converter

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

The APW7080 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 APW7080 is also equipped with power-on-

reset, soft-start, and whole protections (undervoltage, over

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

shutdown mode, the supply current drops below 5

µA.

This device, available in an 8-pin SOP-8P package,

provides a very compact system solution with minimal

external 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

Simplified Application Circuit

Output Current, I

R2

1%

LX

EN

VIN

GND

COMP

U1

APW7080

FB

UGND

V

OUT

+3.3V

L1

4A

D1

VCC

C3

C2

V

IN

+12

C1

10

µF

C5

R4

C6

C4

22

µF

R1

1%

V

IN

C7

(Optional)

10

20

30

40

50

60

70

80

90

100

0.001

0.01

0.1

1

10

V

V