MAXIM MAX1544ETL+TG075

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 allows this device to directly step down high-voltage batteries for the highest possible efficiency. Alternatively, two-stage conversion (stepping down the 5V system supply instead of the battery) at a higher switching frequency provides the minimum possible physical size. The MAX1544 complies with AMD’s desktop and mobile CPU specifications. The switching regulator features soft-start and power-up sequencing, and soft-shutdown. The MAX1544 also features independent four-level logic inputs for setting the suspend voltage (S0–S1). The MAX1544 includes output undervoltage protection, thermal protection, and voltage regulator power-OK (VROK) output. When any of these protection features detect a fault, the controller shuts down. Additionally, the MAX1544 includes selectable overvoltage protection. The MAX1544 is available in a low-profile, 40-pin 6mm x 6mm thin QFN package.

• 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
• Active voltage positioning with adjustable gain and offset, reducing power dissipation and bulk output capacitance requirements
• 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
• Single-stage conversion method allows direct step down of high-voltage batteries for the highest possible efficiency
• Two-stage conversion at a higher switching frequency provides the minimum possible physical size
• Complies with AMD’s desktop and mobile CPU specifications
• Features soft-start, power-up sequencing, and soft-shutdown
• Features independent four-level logic inputs for setting the suspend voltage (S0–S1)
• Includes output undervoltage protection, thermal protection, and voltage regulator power-OK (VROK) output
• Shuts down when any protection feature detects a fault
• Includes selectable overvoltage protection
• Available in a low-profile, 40-pin 6mm x 6mm thin QFN package
• ±0.75% VOUT Accuracy Over Line, Load, and Temperature (1.3V)
• 5-Bit On-Board DAC: 0.675V to 1.55V Output Adjust Range
• Selectable 100kHz/200kHz/300kHz/550kHz Switching Frequency
• 4V to 28V Battery Input Voltage Range
• Adjustable Slew-Rate Control
• Drives Large Synchronous Rectifier MOSFETs
• Selectable Output Overvoltage Protection
• Undervoltage and Thermal-Fault Protection
• Power Sequencing and Timing
• Selectable Suspend Voltage
• Soft-Shutdown
• Selectable Single- or Dual-Phase Pulse Skipping

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