Saturday, December 17, 2016

Buck and Synchronous-Rectifier (PWM) Controller and Output Voltage Monitor (Mosfet Driver)

Buck and Synchronous-Rectifier (PWM)Controller and Output Voltage Monitor The HIP6004D 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 HIP6004D 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 HIP6004D includes a fully TTLcompatible 5-input digital-to-analog converter (DAC) that adjusts the output voltage from 1.1VDC to 1.85VDC 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 HIP6004D 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/s slew rate which enables high converter bandwidth for fast transient performance. The resulting PWM duty ratio ranges from 0% to 100%.

The HIP6004D 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 HIP6004D 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 HIP6004D monitors the current by using the rDS(ON) of the upper MOSFET which eliminates the need for a current sensing resistor.

• 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
- 25mV Binary Steps . . . . . . . . . 1.100VDC to 1.850VDC
• Power-Good Output Voltage Monitor
• Over-Voltage and Over-Current Fault Monitors
- Does Not Require Extra Current Sensing Element,
• Small Converter Size
- Constant Frequency Operation
- 200kHz Free-Running Oscillator Programmable from
50kHz to over 1MHz
• QFN Package:
- Compliant to JEDEC PUB95 MO-220
QFN - Quad Flat No Leads - Package Outline
- Near Chip Scale Package footprint, which improves
PCB efficiency and has a thinner profile
• Pb-Free plus anneal available (RoHS compliant)
• Power Supply for K7™, and Other Microprocessors
• High-Power DC-DC Regulators
• Low-Voltage Distributed Power Supplies