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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DESCRIPTION
The PM66 series of compact, open PCB constructed, AC-DC switching power supplies are capable of delivering 51 to 65 watts of continuous power.
They operate at 90 to 264VAC input voltage without the need of voltage selection.
They are ideally suited for use in medical equipment not for life support.
All models meet the safety requirements of UL, CSA and IEC.

FEATURES
* Recognized or cer ti fied by UL,CSA and TÜV
* Smal l size
* 100% burn-in
* Wide input range 90 to 264VAC
* Input surge current protection
* Overvoltage protect ion
* Overcurrent protect ion
* Compliant wi th RoHS requi rements

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