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Pololu 5V, 1A Step-Down Voltage Regulator D24V10F5 

This is a compact synchronous buck (step-down) regulator that turns higher voltages (up to 36V) into a stable 5V output with up to 1A available (thermals depend on VIN and airflow). It’s a perfect “clean 5V rail” solution for Arduino/ESP32 projects powered from 12V or 24V systems, where linear regulators would waste heat. 

  • Efficient step-down: typical efficiency 80%–93% depending on VIN/load. 
  • Battery-friendly: power-save mode at light loads + low quiescent current (~200µA typical).
  • Soft-start: ~2ms soft-start helps reduce inrush on power-up. 
  • Protection: over-current/short-circuit protection and thermal shutdown. 
  • Prototyping-ready: 0.1" spacing, includes both straight and right-angle 5×1 headers. 
Important notes (please read):
  • Minimum VIN depends on dropout: VIN must be above 5V by the dropout amount, which increases with load (see Pololu dropout graphs). 
  • No reverse-voltage protection: add external protection if polarity mistakes are possible.
  • LC voltage spikes: with long leads and higher VIN, spikes can exceed 36V. Pololu recommends a 33µF+ electrolytic capacitor close to VIN–GND (rated ≥50V), especially if VIN > 20V or wiring is long. 
  • This board can get hot enough to burn during operation—handle carefully. 

Why/Benefits

Clean 5V from “industrial” voltages
  • Great for 12V/24V battery and power-supply systems
  • More efficient and cooler than a 7805-style linear regulator 
  • Stable 5V for sensors, logic modules, and microcontrollers
Built for real projects
  • PG (Power Good) open-drain output for monitoring 5V health 
  • SHDN pin for low-power disable mode (ultra-low draw when off) 
  • Small footprint: ~18×13×3.5mm.

Technical specifications

Product Pololu 5V, 1A Step-Down Voltage Regulator D24V10F5 
Topology Synchronous buck (step-down) switching regulator
Output 5V fixed (±4% accuracy)
Max output current Up to 1A (continuous current depends on VIN and thermal dissipation)
Input voltage [5V + dropout] to 36V (minimum VIN depends on load/dropout)
Typical efficiency 80% to 93%
Switching frequency 500kHz (when not in power-save mode)
Soft-start ~2ms
No-load current ~200µA typical
Protections Over-current/short-circuit protection, thermal shutdown
Extra pins PG (open-drain power-good), SHDN (shutdown/low power)
Board size 0.7" × 0.5" × 0.14" (18 × 13 × 3.5 mm)

Pinout & power notes

  • VIN: input power. Keep leads short; add a 33µF+ electrolytic near VIN–GND if wiring is long or VIN is high. 
  • GND: ground.
  • VOUT: regulated 5V output.
  • SHDN: drive low (<0.4V) to disable output and enter low-power mode; has a 100k pull-up to VIN so it can be left floating to stay on. 
  • PG: open-drain “power good” output (needs pull-up) that indicates when VOUT is within range; held low during soft-start and fault/disable. 

FAQ

  • Can I power this from 24V?
    Yes—VIN can go up to 36V. If your leads are long or VIN is >20V, add a 33µF+ electrolytic capacitor close to VIN–GND to help suppress LC spikes. 
  • Will it always give 1A?
    The regulator is rated up to 1A, but continuous current depends on VIN and how well the board can dissipate heat (airflow, ambient temp). 
  • What are PG and SHDN used for?
    PG lets you monitor whether the 5V rail is in range (open-drain output). SHDN disables the regulator and reduces power draw for battery builds. 

Pololu 5V, 1A Step-Down Voltage Regulator D24V10F5

Pololu 5V, 1A Step-Down Voltage Regulator D24V10F5

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POL2831

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