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MAX8770GTL

Dual-Phase, QuickPWM Controller for IMVP-6+ CPU Core Power Supplies

Maxim Integrated 

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

compensation for 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.

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