MAXREFDES33#: 3.3V @ 300mA, 4.5 ~ 60V in, Buck

The Palo Verde reference design (MAXREFDES33#) is a high-efficiency, high-voltage, synchronous step-down DC/DC converter with integrated MOSFETs operating over a 4.5V to 60V input voltage range and delivering output current up to 300mA at 3.3V. Test results and hardware files provide complete documentation for designs.

The Palo Verde (MAXREFDES33#) subsystem reference design (Figure 1) demonstrates the application of the MAX15062A 60V, 300mA ultra-small, high-efficiency, synchronous step-down converter. The reference design operates over a wide 4.5V to 60V input voltage range, and provides up to 300mA at 3.3V output.

The device features undervoltage lockout, overcurrent protection, and thermal shutdown. The MAX15062A switches at a fixed frequency of 500kHz, and delivers a peak efficiency of 86.77% with the supplied components when the input is 24V.

This general-purpose power solution can be used in many different types of power applications, such as 4–20mA current loops, HVAC and building control, high-voltage LDO replacement, general-purpose point-of-load, etc. In this reference design, the MAX15062 performs in 24V input applications, such as industrial sensors, process control, etc.