Analog Devices MAX1907A Product Info

• Quick-PWM Master Controllers
• Multiphase Conversion with Slave Controller (MAX1980)
• Active Voltage Positioning with Adjustable Gain and Offset
• Adjustable Slew Rate Control
• ±0.75% V_OUT Accuracy Over Line, Load, and Temperature
• 6-Bit On-Board DAC (16mV Increments)
• 0.700V to 1.708V Output Adjust Range
• Selectable 200kHz/300kHz/550kHz/1000kHz Switching Frequency
• 2V to 28V Battery Input Voltage Range
• Drive Large Synchronous Rectifier MOSFETs
• Output Overvoltage Protection (MAX1907A Only)
• Undervoltage and Thermal Fault Protection
• Power Sequencing and Selectable Boot Voltage
• Low-Profile 40-Pin Thin QFN, 6mm x 6mm Package

The MAX1907A/MAX1981A are single-phase, Quick-PWM™ master controllers for IMVP-IV™ CPU core supplies. Multiphase operation is achieved using a Quick-PWM slave controller (MAX1980). Multiphase operation reduces input ripple current requirements and output voltage ripple while easing component selection and layout difficulties. The MAX1907A/MAX1981A include active voltage positioning with adjustable gain and offset, reducing power dissipation and bulk output capacitance requirements.

The MAX1907A/MAX1981A are intended for two different notebook CPU core applications: either bucking down the battery directly, or 5V system supply to create the core voltage. The single-stage conversion method allows these devices 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 higher switching frequency provides the minimum possible physical size.

The MAX1907A/MAX1981A meet the IMVP-IV specifications and include logic to interface with the CPU power good signals from the V_CCP and V_CCMCH rails within the system. The regulator features power-up sequencing, automatically ramping up to the Intel-specified boot voltage. The MAX1907A/MAX1981A feature independent four-level logic inputs for setting the boot voltage (B0–B2) and the suspend voltage (S0–S2).

The MAX1907A/MAX1981A include output undervoltage protection, thermal protection, and system power-OK (SYSPOK) input/output. When any of these protection features detect a fault, the MAX1907A/MAX1981A immediately shut down. Additionally, the MAX1907A includes overvoltage protection.

The MAX1907A/MAX1981A are available in a thin 40-pin QFN package.

Applications

• Servers/Desktop Computers
• Voltage-Positioned Step-Down Converter