The HIP6004E 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 HIP6004E integrates all of the control, output adjustment, monitoring and protection functions into a single package.

The output voltage of the converter is easily adjusted and precisely regulated. The HIP6004E includes a 5-input digital-to-analog converter (DAC) that adjusts the output voltage from 1.05VDC to 1.825VDC in 25mV increments steps. The precision reference and voltage-mode regulator hold the selected output voltage to within ±1 over temperature and line voltage variations.

The HIP6004E provides simple, single feedback loop, voltage-mode control with fast transient response. It includes a 200kHz free-running triangle-wave oscillator that is adjustable from below 50kHz to over 1MHz. The error amplifier features a 15MHz gain-bandwidth product and 6V/μs slew rate which enables high converter bandwidth for fast transient performance. The resulting PWM duty ratio ranges from 0 to 100.

The HIP6004E monitors the output voltage with a window comparator that tracks the DAC output and issues a Power Good signal when the output is within ±10. The HIP6004E protects against over-current and overvoltage conditions by inhibiting PWM operation. Additional built-in overvoltage protection triggers an external SCR to crowbar the input supply. The HIP6004E monitors the current by using the rDS(ON) of the upper MOSFET which eliminates the need for a current sensing resistor.

Features

? Drives two N-Channel MOSFETs

? Operates from +5V or +12V Input

? 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

? 5-Bit digital-to-analog output

Voltage Selection

- 25mV binary steps . . . . . . . . . . . 1.05VDC to 1.825VDC

? Power good output voltage monitor

? Overvoltage and overcurrent fault monitors

- Does not require extra current sensing element,

Uses MOSFET’s rDS(ON)

? Small Converter Size

- Constant Frequency Operation

- 200kHz Free-Running Oscillator Programmable from

50kHz to over 1MHz

? Pb-free available

Applications

? VRM8.5 modules for Pentium III and Other

Microprocessors

? High-Power DC-DC Regulators

? Low-Voltage Distributed Power Supplies