HIP6003

Features:

• Drives N-Channel MOSFET
• 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
• 4-Bit Digital-to-Analog Output Voltage Selection
        - Wide Range . . . . . . . . . . . . . . . . . . .2.0VDC to 3.5VDC
        - 0.1V Binary Steps
• 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +15.0V
Boot Voltage, V_BOOT - V_PHASE. . . . . . . . . . . . . . . . . . . . . . . +15.0V
Input, Output or I/O Voltage . . . . . . .. . . . GND -0.3V to V_CC + 0.3V
ESD Classification . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . Class 2


Description

The HIP6003 provides complete control and protection for a DC-DC converter optimized for high-performance microprocessor applications. It is designed to drive an N-Channel MOSFET in a standard buck topology. The HIP6003 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 HIP6003 includes a 4-Input Digital-to-Analog Converter (DAC) that adjusts the output voltage from 2.0VDC to 3.5VDC in 0.1V increments. The precision reference and voltage-mode regulator hold the selected output voltage to within ±1% over temperature and line voltage variations.

The HIP6003 provides simple, single feedback loop, voltagemode 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 HIP6003 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 HIP6003 protects against over-current conditions by inhibiting PWM operation. Built-in over-voltage protection triggers an external SCR to crowbar the input supply. The HIP6003 monitors the current by using the rDS(ON) of the upper MOSFET which eliminates the need for a current sensing resistor.