MAX1544

19-2745; Rev 1; 9/03 KIT ATION EVALU E L B A AVAIL Dual-Phase, Quick-PWM Controller for AMD Hammer CPU Core Power Supplies General Description Features o Dual-Phase, Quick-PWM Controller o ±0.75% VOUT Accuracy Over Line, Load, and Temperature (1.3V) o Active Voltage Positioning with Adjustable Gain and Offset o 5-Bit On-Board DAC: 0.675V to 1.55V Output Adjust Range o Selectable 100kHz/200kHz/300kHz/550kHz Switching Frequency o 4V to 28V Battery Input Voltage Range o Adjustable Slew-Rate Control o Drives Large Synchronous Rectifier MOSFETs o Selectable Output Overvoltage Protection o Undervoltage and Thermal-Fault Protection o Power Sequencing and Timing o Selectable Suspend Voltage o Soft-Shutdown o Selectable Single- or Dual-Phase Pulse Skipping MAX1544 40 39 38 37 36 35 34 33 32 31 The MAX1544 is a dual-phase, Quick-PWM™, stepdown controller for AMD Hammer™ CPU core supplies. Dual-phase operation reduces input ripple current requirements and output voltage ripple while easing component selection and layout difficulties. The QuickPWM control scheme provides instantaneous response to fast load-current steps. The MAX1544 includes active voltage positioning with adjustable gain and offset, reducing power dissipation and bulk output capacitance requirements. The MAX1544 is intended for two different notebook CPU core applications: stepping down the battery directly or stepping down the 5V system supply to create the core voltage. The single-stage conversion method...