General Description

The MAX8720 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 the 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

♦ 6-Bit On-Board DAC with Input Muxes

♦ Precision-Adjustable VOUT Slew Control

♦ 0.275V to 1.850V Output Adjust Range

♦ Remote Feedback and Ground Sense

♦ Supports Voltage-Positioned Applications

♦ 2V to 28V Battery Input Range

♦ 200kHz/300kHz/550kHz/1000kHz Switching Frequency

♦ Over/Undervoltage Protection

♦ Drives Large Synchronous-Rectifier FETs

♦ 800µA (typ) ICC Supply Current

♦ 10µA (typ) Shutdown Supply Current

♦ 2V ±0.75 Reference Output

♦ PGOOD Blanking During Transition

Applications

    CPU Core Supply Converters

    GPU Core Supply Converters

    Notebook and Subnotebook Computers