Copyright

© ANPEC Electronics Corp.

Rev. A.1 - Feb., 2006

APW7065

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.

Synchronous Buck PWM Controller

•

Single 12V Power Supply Required

•

Fast Transient Response

- 0~90% Duty Ratio

•

0.8V Reference with 1% Accuracy

•

Shutdown Function by Controlling

COMP Pin Voltage

•

Internal Soft-Start (3.4ms) Function

•

Voltage Mode PWM Control Design

•

Under-Voltage Protection

•

Over-Current Protection

- Sense Low Side MOSFET’s R

DS(ON)

•

300KHz Fixed Switching Frequency

•

SOP-8 Package

•

Lead Free Available (RoHS Compliant)

Features

Applications

General Description

The APW7065 uses fixed 300KHz switching frequency,

voltage mode, synchronous PWM controller which

drives dual N-channel MOSFETs. Thedevice integrates

the control, monitoring and protection functions into a

single package, provides one controlled power output

with under-voltage and over-current protections.

The APW7065 provides excellent regulation for output

load variation. The internal 0.8V temperature-

compensated reference voltage is designed to meet

the requirement of low output voltage applications. An

built-in digital soft-start with fixed soft-start interval

prevents the output voltage from overshoot as well as

limiting the input current.

The APW7065 with excellent protection functions:

POR, OCP and UVP. The Power-On Reset (POR)

circuit can monitor VCC supply voltage exceeds its

threshold voltage while the controller is running, and a

built-in digital soft-start provides output with controlled

voltage rise. The Over-Current Protection (OCP)

monitors the output current by using the voltage drop

across the lower MOSFET’s R

internal V

the trip point, the controller will run the soft-start

function until the fault events are removed. The Under-

Voltage Protection (UVP) monitors the voltage of FB

pin for short-circuit protection, when the V

than 50% of V

the IC directly.

Pinouts

SOP-8

•

Graphics Card

•

Mother Board

1

2

3

4

8

7

6

5

PHASE

COMP

FB

VCC

BOOT

UGATE

GND

LGATE