General Description
The MAX1717 step-down controller is intended for core CPU DC-DC converters in notebook computers. It features a dynamically adjustable output, ultra-fast transient response, high DC accuracy, and high efficiency needed for leading-edge CPU core power supplies. Maxim’s proprietary Quick-PWM™ quick-response, constant-on-time PWM control scheme handles wide input/output voltage ratios with ease and provides 100ns “instant-on” response to load transients while maintaining a relatively constant switching frequency.

Features
♦ Quick-PWM Architecture
♦ ±1% VOUT Accuracy Over Line and Load
♦ 5-Bit On-Board DAC with Input Mux
♦ Precision-Adjustable VOUT Slew Control
♦ 0.925V to 2V Output Adjust Range
♦ Supports Voltage-Positioned Applications
♦ 2V to 28V Battery Input Range
♦ Requires a Separate +5V Bias Supply
♦ 200/300/550/1000kHz Switching Frequency
♦ Over/Undervoltage Protection
♦ Drives Large Synchronous-Rectifier FETs
♦ 700µA (typ) ICC Supply Current
♦ 2µA (typ) Shutdown Supply Current
♦ 2V ±1% Reference Output
♦ VGATE Transition-Complete Indicator
♦ Small 24-Pin QSOP Package

Applications
    Notebook Computers with SpeedStep™ or Other Dynamically Adjustable Processors
    2-Cell to 4-Cell Li+ Battery to CPU Core Supply Converters
    5V to CPU Core Supply Converters