General Description

The HT82P604B provides complete control and protection for a DC-DC converter optimized for high performance microprocessor applications. It is designed to drive two N-Channel MOSFETs in a synchronous-rectified buck topology. The HT82P604B integrates all of the control, output adjustment, monitoring and protection functions into a single package.

Features

• Operating voltage: 5V~12V

• Drives two N-Channel MOSFETs

• Simple single-loop control design

- Voltage-mode PWM control

• Fast transient response

- High-bandwidth error amplifier

- Full 0 to 100 duty ratio

• Excellent output voltage regulation

- ±1 over line voltage and temperature

• 5bitdigital-to-analog output voltage selection

- Wide range -1.3V to 3.5V

- 0.1V binary steps from 2.1V to 3.5V

- 0.05V binary steps from 1.3V to 2.05V

• Power-good output voltage monitor

• Over-voltage and over-current sensing element, uses MOSFETs rDS (ON)

• Small converter size

- Constant frequency operation

- 200kHz free-running oscillator programmable from 50kHz to over 1MHz

Applications

• Power supply for PentiumTM, PentiumTM Pro, PowerPCTM and AlphaTM Microprocessors

• High-power5Vto3.xVDC-DCregulators

• Low-voltage distributed power supplies