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