Copyright

© ANPEC Electronics Corp.

Rev. A.3 - 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.

5V to 12V Single Buck Voltage Mode PWM Controller

APW8722/A/B/C/D

Features

General Description

•

Wide 5V to 12V Supply Voltage

•

Power-On-Reset Monitoring on VCC

•

Excellent Output Voltage Regulations

- 0.6V Internal Reference for APW8722/A/D

- 0.8V Internal Reference for APW8722B/C

- ±0.6% Over-Temperature Range

•

Integrated Soft-Start

•

Voltage Mode PWM Operation with External

Compensation

•

Up to 90% Duty Ratio for Fast Transient Response

•

Constant Switching Frequency

- 300kHz ±10% for APW8722/B

- 200kHz ±10% for APW8722C

- 600kHz ±10% for APW8722A/D

•

Integrated Bootstrap Forward P-CH MOSFET

•

50% Under-Voltage Protection

•

125% Over-Voltage Protection

•

Adjustable Over-Current Protection Threshold

- Using the R

•

Shutdown Control by COMP

•

SOP-8P Package

•

Lead Free and Green Devices Available

(RoHS Compliant)

Applications

•

Graphic Cards

•

DSL, Switch HUB

•

Wireless Lan

•

Notebook Computer

•

Mother Board

•

LCD Monitor/TV

The APW8722 is a voltage mode, fixed 200kHz/300kHz/

600kHz switching frequency, synchronous buck converter.

The APW8722 allows wide input voltage that is either a

single 5~12V or two supply voltage(s) for various

applications. A power-on-reset (POR) circuit monitors the

VCC supply voltage to prevent wrong logic controls. A built-

in soft-start circuit prevents the output voltages from over-

shoot as well as limits the input current. An internal 0.6V

temperature-compensated reference voltage with high

accuracy is designed to meet the requirement of low out-

put voltage applications. The APW8722 provides excel-

lent output voltage regulations against load current

variation.

The controller’s over-current protection monitors the out-

put current by using the voltage drop across the RDS

(ON) of low-side MOSFET, eliminating the need for a cur-

rent sensing resistor that features high efficiency and

low cost. In addition, the APW8722 also integrates excel-

lent protection functions. The over-voltage protection (OVP)

, under-voltage protection (UVP). OVP circuit which moni-

tors the FB voltage to prevent the PWM output from over

voltage, and UVP circuit which monitors the FB voltage to

prevent the PWM output from under voltage or short circuit.

The APW8722 is available in SOP-8P packages