Pololu Fine Adjust Step-Down Voltage Regulator, VIN: 3.3-45V, VOUT: [email protected]
The Pololu D30V3x series fine-adjust step-down voltage regulators efficiently convert high input voltages (up to 45 V) into lower, adjustable output voltages ranging from 1.4 V to 7 V. Utilizing advanced synchronous buck converter technology, these regulators offer superior efficiency compared to linear voltage regulators, especially when dealing with large input-output voltage differentials. They support typical continuous output currents between 1A and 5A, with current capability dependent on input and output voltages and thermal dissipation.
Key features include reverse voltage protection up to 40 V, under-voltage lockout, over-current and short-circuit protection, and thermal shutdown. A soft-start function ensures gradual output voltage ramp-up, and a built-in 11-turn precision potentiometer enables fine output voltage adjustment. Additional highlights are its low dropout voltage, power-save mode for light load efficiency, and a "power good" output for voltage monitoring. Compact and robust, this regulator is ideal for various electronics and power supply applications.
Quick Spec
- Input voltage: 3.3 V to 45 V (must exceed output voltage)
- Output voltage: 1.4 V to 7 V (adjustable via precision potentiometer)
- Maximum continuous output current: 3 A to 5 A
- Efficiency: 80% to 95% (depending on load and voltage)
- Switching frequency: ~700 kHz
- Quiescent current: Extremely low
- Reverse voltage protection: Up to 40 V
- Enable pin with low-power shutdown mode (~10 µA to 20 µA per VIN volt)
- Power-save mode for light loads
- "Power good" output for monitoring
- Over-current, short-circuit, and thermal protection
- Dimensions: 22.9 x 30.5 x 7.7mm
Pinout

Typical dropout voltage
The dropout voltage of a step-down regulator is the minimum amount by which the input voltage must exceed the regulator’s target output voltage in order to ensure the target output can be achieved. For example, if a 5 V regulator has a 1 V dropout voltage, the input must be at least 6 V to ensure the output is the full 5 V. Generally speaking, the dropout voltage increases as the output current increases. The graph below shows the dropout voltages at several different output voltages as a function of output current

Resources
Shipping List
- 1 x Pololu Fine Adjust Step-Down Voltage Regulator
- 1 x 6-Pin SIL Male Header
- 2 x 2-Pin Screw Terminal

Pololu Fine Adjust Step-Down Voltage Regulator
- Brand: Pololu Electronics
- Product Code: 4853
- Weight: 0.008kg
- Product Status : Active
Stock
Warehouse | Stock Status | Location |
---|---|---|
Centurion | In Stock | F38 |
Stellenbosch | No Stock |
We ship free of charge between branches to complete your order.
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R349.00 (Inc Tax: R401.35)
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Tags: pololu, step-down voltage regulator, buck converter, pololu d30v3x, adjustable regulator, synchronous regulator, power supply, dc-dc converter, precision regulator, voltage regulator