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