Soft Sw PWM Cntrlr 1-OUT PWM Controller 600KHz 14-Pin TDFN EP T/R

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 0.9 VIN. Maxim"s proprietary Quick-PWM quick-response, constant-on-time PWM control scheme handles wide input/output voltage ratios (low-duty-cycle applications) with ease and provides 100ns "instant-on" response to load transients while maintaining a relatively constant switching frequency. Strong drivers allow the MAX8792 to efficiently drive large synchronous-rectifier MOSFETs. The controller senses the current across the synchronous rectifier to achieve a low-cost and highly efficient valley current-limit protection. The adjustable current-limit threshold provides a high degree of flexibility, allowing thermally compensated protection using an NTC or foldback current-limit protection using a voltage-divider derived from the output. The MAX8792 includes a voltage-controlled soft-start and soft-shutdown in order to limit the input surge current, provide a monotonic power-up (even into a precharged output), and provide a predictable powerup time. The controller also includes output fault protection— undervoltage and overvoltage protection—as well as thermal-fault protection. The MAX8792 is available in a tiny 14-pin, 3mm x 3mm TDFN package. For space-constrained applications, refer to the MAX17016 single step-down with 10A, 26V internal MOSFETs available in a small 40-pin, 6mm x 6mm TQFN package.

• 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 0.9 V_IN Range)

• Feedback Input Regulates to 0 to 2V REFIN Voltage
• 0.5% V_OUT 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