60V, 300mA, ultra-small, synchronous step-down DC-DC converter

July 01, 2013 // By Graham Prophet
A new data sheet from Maxim details the MAX15062 fixed-output high-efficiency, high-voltage, synchronous step-down DC-DC converter with integrated MOSFETs that operates over a 4.5V to 60V input voltage range.

The converter delivers output currents up to 300mA at output voltages of 3.3V (MAX15062A) and 5V (MAX15062B). The device operates over the -40°C to +125°C temperature range and comes in an 8-pin (2mm × 2mm) TDFN package. Simulation models are available.

The device employs a peak-current-mode control architecture with a MODE pin that can be used to operate the device in pulse-width modulation (PWM) or pulse-frequency modulation (PFM) control schemes. PWM operation provides constant frequency operation at all loads and is useful in applications sensitive to variable switching frequency. PFM operation disables negative inductor current and additionally skips pulses at light loads for high efficiency. The low-resistance on-chip MOSFETs ensure high efficiency at full load and simplify the PCB layout.

To reduce input inrush current, the device offers an internal fixed soft-start. The device also incorporates an EN/UVLO pin that allows the user to turn on the part at the desired input-voltage level. An open-drain, active-low RESET pin can be used for output-voltage monitoring.

Peak efficiency is 92% and shutdown current is 2.2µA (typ). For reliable operation in adverse industrial environments it has hiccup-mode current limit and autoretry startup. Use it to power 4–20mA current-loop-powered sensors, in automotive systems, battery-powered equipment and for general-purpose point-of-load locations.

Maxim Integrated, www.maximintegrated.com/datasheet/index.mvp/id/7171