HIP6004

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
       - Wide Range . . . . . . . . . . . . . . . . . . . 1.3VDC to 3.5VDC
       - 0.1V Binary Steps. . . . . . . . . . . . . . . 2.1VDC to 3.5VDC
       - 0.05V Binary Step. . . . . . . . . . . . . . . 1.3VDC to 2.1VDC
• Power-Good Output Voltage Monitor
• Over-Voltage and Over-Current Fault Monitors
       - Does Not Require Extra Current Sensing Element, Uses MOSFETs 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, PowerPC™ 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, V_BOOT - V_PHASE. . . . . . . . . . . . . . . . . . . . . . . . +15V
Input, Output or I/O Voltage . . . . . . . . .  GND -0.3V to V_CC +0.3V
ESD Classification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Class 2


Description

The HIP6004 provides complete control and protection for 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 HIP6004 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 HIP6004 includes a 5-input digital-to-analog converter (DAC) that adjusts the output voltage from 2.1VDC to 3.5VDC in 0.1V increments and from 1.3VDC to 2.1VDC 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 HIP6004 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 HIP6004 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 HIP6004 protects against over-current conditions by inhibiting PWM operation. Built-in over-voltage protection triggers an external SCR to crowbar the input supply. The HIP6004 monitors the current by using the rDS(ON) of the upper MOSFET which eliminates the need for a current sensing resistor.