MAX1907A Datasheet, PDF (1/1 Pages) Maxim Integrated Products – Quick-PWM Master Controllers for Voltage-Positioned CPU Core Power Supplies (IMVP-IV)

19-2678; Rev 0; 9/02
Quick-PWM Master Controllers for Voltage-
Positioned CPU Core Power Supplies (IMVP-IV)
General Description
The MAX1907A/MAX1981A are single-phase, Quick-
PWM™ master controllers for IMVP-IV™ CPU core sup-
plies. 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 differ-
ent 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 specifica-
tions 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 volt-
age. 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 fea-
tures detect a fault, the MAX1907A/MAX1981A immedi-
ately shut down. Additionally, the MAX1907A includes
overvoltage protection.
The MAX1907A/MAX1981A are available in a thin 40-pin
QFN package.
Applications
IMVP-IV™ 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.
Quick-PWM is a trademark of Maxim Integrated Products, Inc.
IMVP-IV is a trademark of Intel Corp.
Features
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% V_OUT 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
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
Pin Configuration
TOP VIEW
40 39 38 37 36 35 34 33 32 31
B0 1
B1 2
B2 3
S0 4
S1 5
S2 6
SHDN 7
REF 8
ILIM 9
VCC 10
MAX1907A
MAX1981A
30 VDD
29 DL
28 PGND
27 DDO
26 D0
25 D1
24 D2
23 D3
22 D4
21 D5
11 12 13 14 15 16 17 18 19 20
40-Pin, 6mm x 6mm Thin QFN
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