Features and Benefits

  • Quad-Phase Quick-PWM EV Kit
  • Mobile and Desktop P4 or AMD Hammer Compatible
  • Active Voltage Positioning with Adjustable Gain, Offset and Remote Sensing
  • High Speed, Accuracy and Efficiency
  • Low Bulk Output Capacitor Count
  • Multiphase Fast-Response Quick-PWM Architecture
    • MAX1544/MAX1545 Dual-Phase Controller
    • Two MAX1980 Slave Controllers
  • 7V to 24V Input Voltage Range
  • 5-Bit On-Board DAC
    • Mobile P4: 0.60V to 1.75V Output Range
    • Desktop P4: 1.10V to 1.85V Output Range
    • AMD Hammer: 0.675V to 1.55V Output Range
  • 68A Load-Current Capability (17A Each Phase)
  • 300kHz Switching Frequency
  • MAX6509 Temperature Sensor
  • 40-Pin Thin QFN Package (MAX1544/MAX1545)
  • 20-Pin Thin QFN Package (MAX1980)
  • Fully Assembled and Tested

Product Details

The MAX1544/MAX1545 evaluation kits (EV kits) demonstrate the high-power, dynamically adjustable multiphase notebook CPU application circuit. This DC-DC converter steps down high-voltage batteries and/or AC adapters, generating a precision, low-voltage CPU core VCC rail. The MAX1544 EV kit meets the mobile and desktop AMD Hammer™ CPU transient voltage specification. The MAX1545 EV kit meets the desktop and mobile Pentium® 4 (P4) CPUs transient voltage specification. The MAX1544/MAX1545 kits consist of the MAX1544 or MAX1545 Dual-Phase Quick-PWM™ stepdown controller, two MAX1980 slave controllers and the MAX6590 temperature sensor. The MAX1544/MAX1545 kits include active voltage positioning with adjustable gain and offset, reducing power dissipation and bulk output capacitance requirements. The kit features independent four-level logic inputs for setting the suspend voltage (S0/S1).

The MAX1980 provides additional gate drive circuitry, phase synchronization, current limit, and current balancing. Precision slew-rate control provides "just-in time" arrival at the new DAC setting, minimizing surge currents to and from the battery.

This fully assembled and tested circuit board provides a 5- bit digitally adjustable output voltage from a 7V to 24V battery input range. The EV kit operates at 300kHz switching frequency and has superior line- and load transient response.


  • AMD Hammer Desktop or Notebook PCs
  • Multiphase CPU Core Supplies
  • Servers/Desktop Computers
  • Voltage-Positioned Step-Down Converters