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MAX8796

1-Phase, Quick-PWM Intel IMVP-6/GMCH Controllers

1-Phase, Intel IMVP-6/6+ Controllers Ideal for Atom CPU and UMPC Designs

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Overview

Description

The MAX8796/MAX8797/MAX17401 are 1-phase Quick-PWM™ step-down VID power-supply controllers for Intel notebook CPUs and graphics. The Quick-PWM control provides instantaneous 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 output capacitors.

The MAX8796/MAX8797/MAX17401 are intended for two different notebook CPU/GPU 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 possible physical size.

A slew-rate controller allows controlled transitions between VID codes. A thermistor-based temperature sensor provides programmable thermal protection. A power monitor provides an analog voltage output proportional to the power consumed by the CPU/GPU.

The MAX8796/MAX17401 implement both the Intel IMVP-6 CPU core specifications, as well as the Intel GMCH graphics core specifications. The MAX8797 implements the Intel GMCH graphics core specifications. The MAX8796/MAX17401 are available in a 32-pin TQFN package. The MAX8797 is available in a 28-pin TQFN package.

Key Features

1-Phase Quick-PWM Controllers
±0.5% V_OUT Accuracy Over Line, Load, and Temperature
7-Bit IMVP-6 DAC (MAX8796/MAX17401 Only)
5-Bit GMCH DAC
Active Voltage Positioning with Adjustable Gain
Accurate Droop and Current Limit
Remote Output and Ground Sense
Adjustable Output-Voltage Slew Rate
Power-Good Window Comparator
Power Monitor
Temperature Comparator
Drives Large Synchronous Rectifier FETs
2V to 26V Power Input Range
Adjustable Switching Frequency (600kHz max)
Output Overvoltage Protection (MAX8796/MAX8797 Only)
Undervoltage and Thermal-Fault Protection
Soft-Startup and Soft-Shutdown
Internal Boost Diodes

Applications/Uses

2 to 4 Lithium-Ion (Li+) Cell Battery-to-CPU Core Supply Converters
Graphics Core Power Supply
IMVP-6/IMVP-6+ Core Power Supply
Intel GMCH Crestline/Cantiga
Notebooks/Desktops/Servers
Voltage-Positioned Step-Down Converters

Design Resources

Quality And Environmental

Product Reliability Reports: MAX8796.pdf

Device	Fab Process	Technology	Sample size	Rejects	FIT at 25°C	FIT at 55°C	Material Composition

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

Quality Management System >
Environmental Management System >

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