Pololu D42V55F8 8.4V 5A Step-Down Voltage Regulator

This compact Pololu D42V55F8 module is a synchronous buck switching regulator for turning a higher DC input into a stable 8.4 V output. It is suited to projects where efficiency matters, especially when the input voltage is much higher than the required output.

The regulator accepts input voltages from 8.4 V up to 60 V and can deliver a regulated 8.4 V output at up to 5 A. Typical continuous output current depends on input voltage and thermal conditions, with efficient operation compared with a linear regulator for reduced heat and better energy use.

Useful control and monitoring signals are broken out, including enable (EN) for low-power shutdown and power-good (PG) for voltage monitoring or sequencing. The board also includes soft-start and built-in protection features, with 0.1″ grid-compatible connections for straightforward prototyping.

Features:

• Synchronous buck conversion: Steps a higher input voltage down to a lower regulated output voltage efficiently.
• Enable input: EN input for low-power shutdown.
• Power-good output: PG output for voltage monitoring and sequencing.
• Soft-start: Limits inrush current.
• Reverse-voltage protection: Built-in reverse-voltage protection.
• Over-current protection: Built-in over-current protection.
• Over-temperature protection: Built-in over-temperature protection.
• Prototyping friendly: Six 0.1″ grid-compatible connections with duplicated power rails.

Specifications:

• Input voltage: 8.4 V up to 60 V
• Regulated output voltage: 8.4 V
• Maximum output current: up to 5 A
• Typical continuous output current: between 3.5 A and 7 A, depending on input voltage and thermal conditions
• Efficiency: approximately 80% to 95%, varying with load and voltage differential
• Switching frequency: around 400 kHz under heavy loads
• Quiescent current: < 0.2 mA at no load
• Dimensions: 1″ × 1″ × 0.355″ (25.4 × 25.4 × 9 mm)
• Mounting holes: three mounting holes for #2 or M2 screws
• Connections: six 0.1″ grid-compatible connections (VIN, VOUT, GND, VRP, EN, PG)
• Power rails: duplicated power rails

A handy regulator for robotics, battery-powered systems, and other DC power projects that need a stable 8.4 V rail from a higher-voltage supply.