19-2678; Rev 0; 9/02 Quick-PWM Master Controllers for VoltagePositioned CPU Core Power Supplies (IMVP-IV) Applications IMVP-IV™ Notebook Computers Single-Phase CPU Core Supply Multiphase CPU Core Supply Voltage-Positioned Step-Down Converters Servers/Desktop Computers ♦ 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 Ordering Information PART TEMP RANGE PIN-PACKAGE MAX1907AETL -40°C to +100°C 40-QFN Thin 6mm x 6mm MAX1981AETL -40°C to +100°C 40-QFN Thin 6mm x 6mm LX BST 37 DH 38 V+ 39 SYSPOK 40 SUS IMVPOK TOP VIEW CLKEN Pin Configuration TIME 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. ♦ Quick-PWM Master Controllers TON The MAX1907A/MAX1981A are single-phase, QuickPWM™ 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. Features 36 35 34 33 32 31 B0 1 30 VDD B1 2 29 DL B2 3 28 PGND S0 4 27 DDO 26 D0 25 D1 S1 5 S2 6 SHDN 7 24 D2 REF 8 23 D3 ILIM 9 22 D4 VCC 10 21 D5 MAX1907A MAX1981A IMVP-IV is a trademark of Intel Corp. 12 13 14 15 16 17 18 19 20 CC POS NEG FB OAIN- OAIN+ CSP CSN DPSLP Quick-PWM is a trademark of Maxim Integrated Products, Inc. 11 GND Typical Operating Circuit appears at end of data sheet. 40-Pin, 6mm x 6mm Thin QFN ________________________________________________________________ Maxim Integrated Products 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. 1 MAX1907A/MAX1981A General Description