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19-2678; Rev 0; 9/02
Quick-PWM Master Controllers for VoltagePositioned CPU Core Power Supplies (IMVP-IV)
General Description
The MAX1907A/MAX1981A are single-phase, QuickPWMTM master controllers for IMVP-IVTM 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. o Quick-PWM Master Controllers o Multiphase Conversion with Slave Controller (MAX1980) o Active Voltage Positioning with Adjustable Gain and Offset o Adjustable Slew Rate Control o 0.75% VOUT Accuracy Over Line, Load, and Temperature o 6-Bit On-Board DAC (16mV Increments) o 0.700V to 1.708V Output Adjust Range o Selectable 200kHz/300kHz/550kHz/1000kHz Switching Frequency o 2V to 28V Battery Input Voltage Range o Drive Large Synchronous Rectifier MOSFETs o Output Overvoltage Protection (MAX1907A Only) o Undervoltage and Thermal Fault Protection o Power Sequencing and Selectable Boot Voltage o Low-Profile 40-Pin Thin QFN, 6mm 6mm Package
Features
MAX1907A/MAX1981A
Ordering Information
PART TEMP RANGE PIN-PACKAGE 40-QFN Thin 6mm x 6mm 40-QFN Thin 6mm x 6mm MAX1907AETL -40C to +100C MAX1981AETL -40C to +100C
Pin Configuration
SYSPOK IMVPOK CLKEN TIME TON 40 B0 1 2 3 4 5 6 7 8 9 10 39 38 37 36 35 34 33 32 31 30 29 28 27 VDD DL PGND DDO D0 D1 D2 D3 D4 D5 BST 26 25 24 23 22 21 20 DPSLP DH 18 CSP LX 19 CSN V+ 17 OAIN+
TOP VIEW
Applications
IMVP-IVTM Notebook Computers Single-Phase CPU Core Supply Multiphase CPU Core Supply Voltage-Positioned Step-Down Converters Servers/Desktop Computers
Typical Operating Circuit appears at end of data sheet.
B1 B2 S0 S1 S2 SHDN REF ILIM VCC
MAX1907A MAX1981A
11 GND
12 CC
13 POS
14 NEG
15 FB
16 OAIN-
Quick-PWM is a trademark of Maxim Integrated Products, Inc. IMVP-IV is a trademark of Intel Corp.
40-Pin, 6mm x 6mm Thin QFN
________________________________________________________________ Maxim Integrated Products
SUS
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For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.

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