Pololu
Pololu 5V, 300mA Step-Down Voltage Regulator D24V3F5
The Pololu D24V3F5 is a compact buck (step-down) switching voltage regulator that converts input voltages up to 42 V down to a fixed 5 V output. With a typic...
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The Pololu D24V3F5 is a compact buck (step-down) switching voltage regulator that converts input voltages up to 42 V down to a fixed 5 V output. With a typical efficiency of 80–90%, it significantly outperforms linear regulators like the 7805, especially when there is a large difference between input and output voltage.
The board features built-in short-circuit protection and thermal shutdown. Pins are spaced on a standard 0.1″ (2.54 mm) grid for easy use with breadboards and prototyping headers — a straight and right-angle header strip are both included.
Key Features
- Fixed 5 V Output – 4% accuracy, 300 mA maximum output current
- Wide Input Range – Accepts up to 42 V input (must exceed output voltage plus dropout)
- High Efficiency – 80–90% typical, far better than linear regulators
- 1.25 MHz Switching Frequency – Enables small external components
- Low Quiescent Current – 2 mA typical; 20 µA in shutdown mode
- Built-In Protection – Over-temperature and over-current shutoff
- Shutdown Pin – Drive SHDN low (under 0.3 V) to enter low-power mode, or tie to VIN to keep the regulator permanently enabled
- Compact Size – 13 × 10 × 3 mm
Connections
- SHDN – Shutdown control (active low). Drive low to disable output, high (>2.3 V) or tie to VIN to enable
- VIN – Input voltage (up to 42 V maximum)
- GND – Ground
- VOUT – Regulated 5 V output
Ideal For
- Battery-powered projects needing a stable 5 V supply
- Replacing inefficient 7805-style linear regulators
- Robotics, drones, and portable electronics with higher input voltages
Package Contents
- 1× Pololu D24V3F5 Step-Down Voltage Regulator
- 1× 4-pin straight male header strip
- 1× 4-pin right-angle male header strip
Resources
Jargon buster
Plain-language definitions for the technical terms used above.
- active LOW
- Active LOW describes a signal that is treated as active, asserted or 'on' when it sits at a low voltage near ground, rather than at a high voltage. It applies to inputs, outputs and control lines (such as reset or chip-select), so it matters when wiring devices so that signal levels are interpreted as intended.
- electrolytic capacitor
- An electrolytic capacitor is a type of capacitor that can store relatively large amounts of electrical charge in a small package. It is commonly used for smoothing power supplies, reducing noise, and short-term energy storage, but it usually has polarity so it must be installed the correct way around.
- GND
- GND is the ground or reference connection (0 V) for a circuit. When connecting two devices together, their grounds must be joined so both agree on what counts as a low or high signal.
- Headers
- Rows of connector contacts on a fixed pitch (commonly 2.54 mm) used to link a board to a breadboard, jumper wires, or another board. They come as male pin headers and female socket headers; when a module ships with pre-soldered headers it can be used straight away, whereas bare pads require soldering the pins yourself.
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