Product Overview
The Pololu D42V55F5.3 is a compact synchronous step-down (buck) switching regulator that takes input voltages from 5.3 V up to 60 V and delivers a tightly regulated 5.3 V output at up to 6 A (typical continuous current at 42 V in). A step-down converter reduces a higher input voltage to a lower output voltage while increasing the available current and doing so far more efficiently than a linear regulator; this means less heat and better energy use in high-difference applications.
The board supports typical continuous output currents between 4 A and 8 A, depending on input voltage and thermal conditions. Efficiency ranges from approximately 70% to 95%, variable based on load and voltage differential. It operates at around 400 kHz switching frequency under heavy loads, with ultra-low quiescent current (< 0.2 mA) at no load.
Features include an enable (EN) input for low-power shutdown (~0.1 mA quiescent), a power-good (PG) output for voltage monitoring and sequencing, soft-start to limit inrush current, and built-in reverse-voltage, over-current, and over-temperature protection. The module measures 1″ × 1″ × 0.355″ (25.4 × 25.4 × 9 mm), includes three mounting holes for #2 or M2 screws, and exposes six 0.1″ grid-compatible connections (VIN, VOUT, GND, VRP, EN, PG) with duplicated power rails for easy prototyping.
