The HIP6004A 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 HIP6004A 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 HIP6004A includes a fully TTL compatible 5-input digital-to-analog converter (DAC) that adjusts the output voltage from 2.1VDC to 3.5VDC in 0.1V increments and from 1.8VDC to 2.05VDC in 0.05V steps. The precision reference and voltage-mode regulator hold the selected output voltage to within ±1 over temperature and line voltage variations.

The HIP6004A 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/ms slew rate which enables high converter bandwidth for fast transient performance. The resulting PWM duty ratio ranges from 0 to 100.

The HIP6004A 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 HIP6004A protects against over-current and over-voltage conditions by inhibiting PWM operation. Additional built-in over-voltage protection triggers an external SCR to crowbar the input supply. The HIP6004A monitors the current by using the rDS(ON) of the upper MOSFET which eliminates the need for a current sensing resistor.

特性 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

? TTL-Compatible 5-Bit Digital-to-Analog Output Voltage

Selection

- Wide Range . . . . . . . . . . . . . . . . . . . 1.8VDC to 3.5VDC

- 0.1V Binary Steps. . . . . . . . . . . . . . . 2.1VDC to 3.5VDC

- 0.05V Binary Steps. . . . . . . . . . . . . 1.8VDC to 2.05VDC

? Power-Good Output Voltage Monitor

? Over-Voltage and Over-Current 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

Applications

? Power Supply for Pentium?, Pentium Pro, Pentium II,

PowerPC?, K6?, 6X86? and Alpha? Microprocessors

? High-Power 5V to 3.xV DC-DC Regulators

? Low-Voltage Distributed Power Supplies