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Product description: D42V55F12 - step-down converter - 12 V 4.5 A - Pololu 5577
The Pololu D42V55F12 is an efficient step-down (buck) converter from the D42V55Fx series. It is designed to effectively reduce voltage from 12V to 60V to a stable 12V level. Compared to traditional linear regulators, it offers significantly higher energy efficiency , which translates to lower power losses and lower operating temperatures. The converter is equipped with a soft start function, a Power Good (PG) output, an Enable (EN) input for remote module on/off, and reverse power protection . Thanks to its small size and high current capacity, the module is suitable for both hobbyist and professional applications. The maximum continuous current is 4.5A .
D42V55F12 - step-down converter - 12 V 4.5 A - Pololu 5577.
The converter provides a stable voltage of 12 V.
Main features of the step-down converter
- Input voltage from 12V to 60V : allows operation with a wide range of power sources
- Stabilized output voltage 12 V : regulation accuracy is ±3%
- Output current up to 4.5 A : high performance for demanding receivers
- Efficiency from 85% to 95% : reduces energy losses and system heating
- Synchronous buck converter : ensures high operating efficiency
- Soft-Start function : limits the starting current during startup
- Power Good (PG) Output : allows monitoring of the correctness of the output voltage
- Enable input (EN) : allows remote control of the inverter operation
- Reverse polarity protection : increases system safety
- Overcurrent and thermal protection : protects the module from damage
- Low no-load current consumption : less than 0.2 mA at higher input voltages
- Compact dimensions of 25.4 x 25.4 mm : easy integration into electronics projects
Pololu D42V55F12 step-down converter pinout
The module is equipped with six basic pins arranged in a 2.54 mm pitch , which allows for cooperation with breadboards and standard goldpin connectors . VIN is used to connect the input voltage, while VOUT provides a regulated 12V voltage. The GND pins function as the system ground. An additional VRP pin provides access to the input voltage after the reverse polarity protection circuit. The EN input allows remote shutdown of the converter and entry into low-power mode, while the PG (Power Good) output monitors the correctness of the output voltage and can be used in power sequencing or diagnostic systems.
Module pins.
Typical converter efficiency.
Converter efficiency and current
The Pololu D42V55F12 converter is designed for heavy-duty operation. Typical maximum continuous output current is 4.5 A at 42 V input , but the actual output depends on the input voltage, ambient temperature, and cooling conditions. At lower input voltages, the module can deliver up to approximately 6.5 A , while at voltages approaching 60 V, the available continuous current is approximately 3.5 A. Thanks to its synchronous design, power conversion efficiency reaches 85% to 95% , reducing power loss and heat generation. In the event of an overload, built-in overcurrent and thermal protection are activated to protect the module from damage.
Technical specifications of the converter
- Converter type: step-down (buck)
- Input voltage: 12V to 60V
- Output voltage: 12V (±3%)
- Typical maximum output current: 4.5 A
- Typical continuous output current range: 3.5 A to 6.5 A
- Efficiency: 85% to 95%
- Switching frequency: approximately 400 kHz
- Maximum quiescent current: 10 mA
- Typical quiescent current at higher input voltages: less than 0.2 mA
- Off mode current: approximately 50 µA + 1 µA/V input voltage
- Input Enable (EN): Yes
- Power Good (PG) Output: Yes
- Reverse polarity protection: yes
- Overcurrent protection: yes
- Thermal protection: yes
- Mounting holes: 3 x M2
- Pin pitch: 2.54 mm
- Dimensions: 25.4 x 25.4 x 9 mm
- Weight: 6.5 g
Contents of the set
- 1x D42V55F12 - step-down converter - 12V 4.5A - Pololu 5577
Popular goldpin strips can be soldered into the holes - the pinout pitch is 2.54 mm.
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