High-efficiency 300 mA step-down DC/DC reference design

March 06, 2014 // By Graham Prophet
Maxim has posted details of its Palo Verde reference design (MAXREFDES33#); 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 300 mA at 3.3V.

The Palo Verde subsystem reference design demonstrates the application of the MAX15062A 60V, 300 mA 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 300 mA at 3.3V output. The device features undervoltage lockout, overcurrent protection, and thermal shutdown. The MAX15062A switches at a fixed frequency of 500 kHz, 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, and process control.

It features;

- Minimal external components and low system cost

- Versatile functionality allows stocking of fewer DC-DC regulators

- Low power dissipation

- Reliable operation in adverse industrial environments

This reference board is designed in a Pmod-compatible form factor with IO pass-through, but can be used in any 4.5V–60V to 3.3V power application up to 300mA. The board is available for purchase.

Maxim Integrated; www.maximintegrated.com/app-notes/index.mvp/id/5815