Pololu 12V 9A Step-Down Voltage Regulator D42V110F12

  The Pololu D42V110F12 is a compact, high-power   12V buck regulator designed to step down higher DC voltages into a stable   12V output. It supports an input range of 12V to 60V and can deliver a   typical maximum continuous output current of around 9A at 42V input, depending on airflow,   input voltage, load, and heat conditions.

  This is a great power module for robotics, motor systems, battery-powered builds, LED projects,   and other electronics that need an efficient 12V supply from a higher-voltage source.

Key Features

• Fixed 12V output with ±3% accuracy
• Wide input range: 12V to 60V DC
• Typical max output current: 9A at 42V input
• High efficiency: typically above 90%, depending on input voltage and load
• Synchronous buck regulator for better efficiency than linear regulators
• Soft-start feature to limit inrush current during startup
• Enable pin for low-power shutdown control
• Power-good output for voltage monitoring and system sequencing
• Protection features: reverse-voltage protection, over-current protection, and thermal shutdown
• Compact board size: 31.8mm × 43.2mm × 9mm

Why Use This Regulator?

• Efficient power conversion: Ideal when dropping from high battery voltages to 12V.  
• Good for higher-current loads: Suitable for systems that need more current than small buck modules can provide.  
• Built-in safety features: Helps protect the board from common power faults.  
• Easy mounting: Includes four mounting holes for #2 or M2 screws.  

Common Applications

• Robotics power systems
• 12V motor and actuator projects
• Battery-powered electronics
• LED lighting systems
• RC and mobile robot platforms
• Industrial and lab prototype power rails

Technical Specifications

Connection Notes

• VIN: Connect to the input power source.
• GND: Ground connection. All grounds are common.
• VOUT: Regulated 12V output.
• ENA: Optional enable input for turning the regulator on/off.
• PG: Optional power-good output for voltage monitoring.
• PFM: Optional mode pin for light-load efficiency or fixed-frequency operation.

Important Usage Notes

• This regulator can get hot during normal use. Avoid touching it while powered.
• Continuous output current depends on input voltage, airflow, ambient temperature, and heat sinking.
• For high-current loads, use thick wires and secure input/output connections.
• Use extra protection such as fuses or breakers for demanding power systems.
• Make sure your input voltage is high enough above 12V to account for dropout at your load current.

Recommended Add-ons

• 5mm pitch terminal blocks for easier power wiring
• 0.1-inch header pins for control pins
• High-current wire for VIN, GND, and VOUT connections
• Fuse or circuit breaker for added power protection

FAQ

Can this boost voltage?
No. This is a step-down regulator. The input voltage must be higher than the required 12V output, including dropout allowance.

Can it really supply 9A continuously?
It can typically supply up to 9A at 42V input, but real output depends on cooling, load, and input voltage.

Is this better than a linear regulator?
Yes for high-voltage step-down use. It is a switching regulator, so it is much more efficient than a linear regulator.

Does it have protection features?
Yes. It includes reverse-voltage protection, over-current protection, and over-temperature shutoff.

Manila stock. Order before 16:00 PHT, ships today via J&T or LBC. Provincial: 1–3 working days.

Schools / class POs: we accept Purchase Orders for accredited schools and universities. contact us with your PO details.

Returns: 7-day inspection window for DOA units. Email proof of issue and we ship a replacement.