Copyright

© ANPEC Electronics Corp.

Rev. A.5 - Sep., 2011

APW7083

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.

5A, 26V, 380kHz, Synchronous Step-Down Converter

Features

•

Wide Input Voltage from 4.5V to 26V

•

Output Current Up to 5A

•

Adjustable Output Voltage from 0.8V to 90%V

IN

- 0.8V Reference Voltage

-

±2.5% System Accuracy

•

Integrated 50m

Ω P-Channel Power MOSFET and

20m

Ω N-Channel Power MOSFET

•

High Efficiency up to 95%

•

Current-Mode Operation

- Stable with Ceramic Output Capacitors

- Fast Transient Response

•

Power-On-Reset Monitoring

•

Fixed 380kHz Switching Frequency in PWM Mode

•

Automatic Pulse-Skipping Mode (PSM)/PWM

Mode Operation

•

Built-in Digital Soft-Start

•

Output Current-Limit Protection with Frequency

Foldback

•

70% Under-Voltage Protection

•

Over-Temperature Protection

•

118% Over-Voltage Protection

•

<5

µA Quiescent Current During Shutdown

•

Thermal-Enhanced TQFN5x6-28 Package

•

Pb-Free Available as an Option

•

Lead Free and Green Devices Available

(RoHS Compliant)

Applications

General Description

The APW7083 is a 5A, synchronous, step-down converter

with integrated 50m

Ω P-channel power MOSFET and

20m

Ω N-channel power MOSFET. The device, with cur-

rent-mode control scheme, can convert 4.5~26V input volt-

age to the output voltage adjustable from 0.8 to 90% V

provide excellent output voltage regulation.

The APW7083 regulates the output voltage in an auto-

matic PSM/PWM mode operation, depending on the out-

put current, for high efficiency operation over light to full

load current. The APW7083 is also equipped with power-

on-reset, soft-start, and whole protections (including over-

voltage, under-voltage, over-temperature, and current-

limit) in a single package. In shutdown mode, the supply

current drops below 5

µA.

This device, available in 28-pin TQFN5x6 package, pro-

vides a very compact system solution with minimal exter-

nal components and good thermal conductance.

•

LCD Monitor / TV

•

SetTop Box

•

Portable DVD

•

Wireless LAN

•

ADSL, Switch HUB

•

Notebook Computer

•

Step-Down Converters Requiring High Efficiency

and 5A Output Current

Simplified Application Circuit

R2

1%

LX

EN

VIN

GND

COMP

U1

APW7083

FB

UGND

V

OUT

0.8V~90%V

L1

5A

VCC

C3

1

µF

C2

1

µF

V

IN

4.5V~26V

C1

10

µF

C5

R4

C6

C4

22

µF

R1

1%

V

IN

C7

(Optional)

R5

100k

Ω

ZCS

PGND