CONFIDENTIAL INFORMATION – RESTRICTED TO INTEL® IMVP-6 LICENSEES
19-3913; Rev 0; 10/05
MAX8770/MAX8771/MAX8772 Dual-Phase, Quick-
PWM Controller for IMVP-6+ CPU Core Power Supplies
General Description
The MAX8770/MAX8771/MAX8772 are 2/1-phase inter-
leaved Quick-PWM™ step-down VID power-supply con-
trollers for notebook CPUs. True out-of-phase operation
reduces input ripple current requirements and output volt-
age ripple while easing component selection and layout
difficulties. The Quick-PWM control provides instanta-
neous response to fast load current steps. Active voltage
positioning reduces power dissipation and bulk output
capacitance requirements and allows ideal positioning
www.DcaotamSphenest4aUti.ocnomfor tantalum, polymer, or ceramic bulk out-
put capacitors.
The MAX8770/MAX8771/MAX8772 are intended for two
different notebook CPU core applications: either bucking
down the battery directly to create the core voltage, or
else bucking down the +5V system supply. The single-
stage conversion method allows this device to directly
step down high-voltage batteries for the highest possible
efficiency. Alternatively, 2-stage conversion (stepping
down the +5V system supply instead of the battery) at
higher switching frequency provides the minimum possi-
ble physical size.
A slew-rate controller allows controlled transitions
between VID codes, controlled soft-start and shutdown,
and controlled exit from suspend. A thermistor-based
temperature sensor provides a programmable thermal-
fault output (VRHOT). A power-monitor output (POUT)
provides an analog voltage output proportional to the
power consumed by the CPU. The MAX8770/MAX8771/
MAX8772 include output undervoltage protection (UVP)
and thermal protection, and the MAX8770/MAX8771 also
include overvoltage protection (OVP). When any of these
protection features detect a fault, the controller shuts
down. A voltage-regulator power-OK (PWRGD) output
indicates the output is in regulation. A clock enable
(CLKEN) output provides proper system startup sequenc-
ing. Additionally, the MAX8771 has a phase-good
(PHASEGD) output, and the MAX8770/MAX8772 includes
true differential current sense.
The MAX8770/MAX8771/MAX8772 implement the Intel
IMVP-6+ code set and the required IMVP-6+ control sig-
nals. The MAX8770/MAX8771/MAX8772 are available in a
40-pin TQFN package.
Applications
IMVP-6+ Core Supply
Multiphase CPU Core Supply
Voltage-Positioned, Step-Down Converters
Notebook/Desktop Computers
Blade Servers
Intel is a registered trademark of Intel, Corp.
Quick-PWM is a trademark of Maxim Integrated Products, Inc.
Features
♦ Single/Dual-Phase, Quick-PWM Controller
♦ ±0.4% VOUT Accuracy Over Line, Load, and
Temperature
♦ 7-Bit On-Board DAC: 0 to +1.5000V Output Adjust
Range
♦ Dynamic Phase Selection Optimizes Active/Sleep
Efficiency
♦ Transient Phase Overlap Reduces Output
Capacitance
♦ Integrated Boost Switches
♦ Active Voltage Positioning with Adjustable Gain
♦ Programmable 200kHz to 600kHz Switching
Frequency
♦ Accurate Current Balance and Current Limit
♦ Adjustable Slew-Rate Control
♦ Power-Good (PWRGD), Clock Enable (CLKEN),
Power Monitor (POUT) and Thermal Fault
(VRHOT) Outputs
♦ Phase Fault (PHASEGD) Output (MAX8771)
♦ Drives Large Synchronous Rectifier MOSFETs
♦ 4V to 26V Battery-Input-Voltage Range
♦ Output OV Protection (MAX8770/MAX8771)
♦ UV and Thermal-Fault Protection
♦ Power Sequencing and Timing
♦ Soft-Startup and Soft-Shutdown
Ordering Information
PART
TEMP
PIN-PACKAGE
MAX8770GTL+ -40°C to +105°C 40 Thin QFN 6mm x 6mm
MAX8771GTL+ -40°C to +105°C 40 Thin QFN 6mm x 6mm
MAX8772GTL+ -40°C to +105°C 40 Thin QFN 6mm x 6mm
+Denotes lead-free package.
Pin Configuration appears at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
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.
