General Description
The MAX1519/MAX1545 are dual-phase, Quick-PWM™, step-down controllers for desktop and mobile Pentium® 4 (P4) CPU core supplies. Dual-phase operation reduces input ripple current requirements and output voltage ripple while easing component selection and layout difficulties. The Quick-PWM control scheme provides instantaneous response to fast load-current steps. The MAX1519/MAX1545 include active voltage positioning with adjustable gain and offset, reducing power dissipation and bulk output capacitance requirements.

Features
♦ Dual-Phase, Quick-PWM Controllers
♦ ±0.75% VOUT Accuracy Over Line, Load, and
   Temperature (1.3V)
♦ Active Voltage Positioning with Adjustable Gain
   and Offset
♦ 5-Bit On-Board DAC
   Mobile: 0.60V to 1.75V Output Range
   Desktop: 1.10V to 1.85V Output Range
♦ Selectable 100kHz/200kHz/300kHz/550kHz
   Switching Frequency
♦ 4V to 28V Battery Input Voltage Range
♦ Adjustable Slew-Rate Control
♦ Drive Large Synchronous Rectifier MOSFETs
♦ Output Overvoltage Protection (MAX1545 Only)
♦ Undervoltage and Thermal-Fault Protection
♦ Power Sequencing and Timing
♦ Selectable Suspend Voltage (0.675V to 1.45V)
♦ Soft-Shutdown
♦ Selectable Single- or Dual-Phase Pulse Skipping

Applications
   Desktop and Mobile P4 Computers
   Multiphase CPU Core Supply
   Voltage-Positioned Step-Down Converters
   Servers/Desktop Computers
   Low-Voltage, Digitally Programmable Power Supplies