General Description
The MAX1907A/MAX1981A are single-phase, Quick-PWM™ master controllers for IMVP-IV™ CPU core supplies. Multi-phase 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 VCCP and VCCMCH 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.

Features
*Quick-PWM Master Controllers
*Multiphase Conversion with Slave Controller (MAX1980)
*Active Voltage Positioning with Adjustable Gain and Offset
*Adjustable Slew Rate Control
*±0.75% VOUT 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 ✕ 6mm Package

Applications
*IMVP-IV™ Notebook Computers
*Single-Phase CPU Core Supply
*Multiphase CPU Core Supply
*Voltage-Positioned Step-Down Converters
*Servers/Desktop Computers

MAX1981A, MAX1907AETL, MAX1981AETL

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