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General Description

The MAX8792 pulse-width modulation (PWM) controller provides high efficiency, excellent transient response, and high DC-output accuracy needed for stepping down high-voltage batteries to generate low-voltage core or chipset/RAM bias supplies in notebook computers. The output voltage can be dynamically controlled using the dynamic REFIN, which supports input voltages between 0 to 2V. The REFIN adjustability combined with a resistive voltage-divider on the feedback input allows the MAX8792 to be configured for any output voltage between 0 to 0.9VIN.

Features

? Quick-PWM with Fast Transient Response

? Supports Any Output Capacitor

??? No Compensation Required with Polymers/Tantalum

??? Stable with Ceramic Output Capacitors Using External Compensation

? Precision 2V ±10mV Reference

? Dynamically Adjustable Output Voltage (0 to 0.9VIN Range)

??? Feedback Input Regulates to 0 to 2V REFIN Voltage

??? 0.5 VOUT Accuracy Over Line and Load

? 26V Maximum Input Voltage Rating

? Adjustable Valley Current-Limit Protection

??? Thermal Compensation with NTC

??? Supports Foldback Current Limit

? Resistively Programmable Switching Frequency

? Overvoltage Protection

? Undervoltage/Thermal Protection

? Voltage Soft-Start and Soft-Shutdown

? Monotonic Power-Up with Precharged Output

? Power-Good Window Comparator

Applications

??? Notebook Computers

??? I/O and Chipset Supplies

??? GPU Core Supply

??? DDR Memory—VDDQ or VTT

??? Point-of-Load Applications

??? Step-Down Power Supply