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TD1722

TD1722 Single Buck Voltage Mode PWM Controller

(DATASHEET)

The TD1722 is a voltage mode, fixed 200kHz/300kHz/600kHz switching frequency, synchronous buck converter. The APW 8722 allows wide input voltage that is either a si ngl e 5 ~1 2V or two su ppl y vol tag e(s ) for va rio us 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/0.8V Temperature-compensated reference voltage with high accuracy is designed to meet the requirement of low out- put voltage applications. The APW 8722 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 TD1722 also integrates excel- lent protection functions. The over-voltage protection (OVP), under-voltage protection (UVP). OVP circuit which monitors 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 TD1722 is available in SOP-8P packages

Features

Wide 5V to 12V Supply Voltage

Power-On-Reset Monitoring on VCC

Excellent Output Voltage Regulations

0.6V Internal Reference for TD1722/A/D

0.8V Internal Reference for TD1722B/C

±0.6% Over-Temperature Range

Integrated Soft-Start

Voltage Mode PWM Operation with External Compensation

Up to 90%DutyRatio for Fast Transient Response

Constant Switching Frequency

300kHz ±10% for TD1722/B

200kHz ±10% for TD1722C

600kHz ±10% for TD1722A/D

Integrated Bootstrap Forward P-CH MOSFET

50%Under-Voltage Protection

125%Over-Voltage Protection

Adjustable Over-Current Protection Threshold

Using the RDS(ON) of Low-Side MOSFET

Shutdown Control byCOMP

SOP-8P Package

Lead Free and Green Devices Available

Applications

Graphic Cards

DSL, Switch HUB

Wireless Lan

Notebook Computer

Mother Board

LCD Monitor/TV

Typical Application Circuit

AMERICA TECHCODE SEMICONDUCTOR, INC.