D36V6F3 3.3V Step-Down Regulator (4–50V In, up to 600mA) w/ Shutdown Pin

Need a clean 3.3V rail from higher-voltage sources like 12V/24V systems or battery packs? The Pololu D36V6F3 is a tiny, high-efficiency buck (step-down) regulator that accepts a wide 4–50V input and outputs 3.3V (±4% accuracy). It’s a great alternative to linear regulators when the voltage drop is big—less heat, better battery life, and more stable power for 3.3V MCUs/sensors.

Why/Benefits

• Wide input range: handles up to 50V input (buck down to 3.3V).
• Efficient switching: far less heat than linear regulators when stepping down from 12V/24V.
• High-voltage SHDN pin: drive low (<1.25V) to disable the output and enter a low-power state (typ. under 2µA).
• Low quiescent current: typically <0.1 mA while enabled (good for battery builds).
• Protection built in: over-current/short-circuit protection + thermal shutdown.

Technical specifications

Pinout & power notes

• VIN: input supply (4–50V). Keep leads short/thick when possible.
• VOUT: regulated 3.3V output.
• GND: common ground with your load/MCU.
• SHDN: pull low (<1.25V) to disable output and enter low-power mode; leave floating if unused (enabled by default).
• LC spikes: if using long leads or higher VIN, place a 33µF+ electrolytic close to VIN/GND.

FAQ

• Can I power an ESP32 from 12V or 24V using this?

  Yes—this is a common use case. Just ensure your load current stays within the module’s thermal limits, and add a VIN capacitor for long leads.

• Does it have an enable pin?

  Yes—use SHDN. Pull it low to shut the regulator off and reduce standby draw.

• Is 600mA guaranteed continuously?

  600mA is the rated maximum, but continuous current depends on VIN, airflow, and heat. If you’re near the limit, provide airflow and keep wiring clean.