HIP6004A

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


Application

• 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


Pinout




Specifications

Supply Voltage, V_CC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +15V
Boot Voltage, VBOOT - VPHASE. . . . . . . . . . . . . . . . . . . . . . . . +15V
Input, Output or I/O Voltage . . . . . . . . . . .GND -0.3V to V_CC +0.3V
ESD Classification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Class 2


Description

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 TTLcompatible 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.