Step-Down (Buck) Voltage Regulators

Switching buck converters reduce an input voltage to a lower, regulated voltage much more efficiently than linear regulators. For quick comparison, the following tables shows some of the key stats for the regulators in this category. Please note that some of these regulators are still affected by the global parts shortages or other supply chain constraints, which makes them cost more than other alternatives even though they are not necessarily better, so we have those listed separately under their own section.

Newer and preferred products

Regulator Output voltage (V) Max output current Max input voltage Typical efficiency Size Price
D36V50Fx family 3.3, 5, 6, 7.5, 9, 12 2 – 9 A 50 V 80% – 95% 1″ × 1″ $24.95
D36V28Fx family 3.3, 5, 6, 7.5, 9, 12 2 – 4 A 50 V 80% – 95% 0.7″ × 0.8″ $15.95 to $16.95
New!
D30V30Fx family
3.3, 5, 6, 7.5, 9, 12, 15 2 – 4 A 45 V 80% – 95% 0.7″ × 0.8″ $12.95 to $13.95
D24V22Fx family 3.3, 5, 6, 7.5, 9, 12 2.2 – 2.6 A 36 V 85% – 95% 0.7″ × 0.7″ $11.95 to $12.95
D36V6x family 3.3, 5, 6, 9, 12, 15
2.5 – 7.5
4 – 25
0.6 A 50 V 60% – 95% 0.4″ × 0.5″
0.4″ × 0.6″
0.4″ × 0.6″
$6.95 to $8.95

Older or supply-chain-constrained products

Regulator Output voltage (V) Max output current Max input voltage Typical efficiency Size Price
D24V150Fx family 3.3, 5, 6, 7.5, 9, 12 15 A 40 V 80% – 95% 1.25″ × 1.7″ $79.95
#2866: D24V90F5 5 9 A 38 V 80% – 95% 0.8″ × 1.6″ $32.95
#2851: D24V50F5 5 5 A 38 V 85% – 95% 0.7″ × 0.8″ $27.95
D24V10Fx family 3.3, 5, 6, 9, 12 1 A 36 V 80% – 95% 0.5″ × 0.7″ $9.95
D24V5Fx family 1.8, 2.5, 3.3, 5, 6, 9, 12, 15 0.5 A 36 V 75% – 95% 0.4″ × 0.5″ $5.95

Mature products (generally not recommended for new designs)

Regulator Output voltage (V) Max output current Max input voltage Typical efficiency Size Price
D24V25Fx family 3.3, 5, 6, 7.5, 9 2.5 A 38 V 80% – 95% 0.7″ × 0.7″ $17.95 to $18.95
D24V6Fx family 3.3, 5, 9, 12 0.6 A 42 V 80% – 95% 0.4″ × 0.5″ $6.95
D24V3x family 3.3, 5, 9, 12
2.5 – 7.5
4 – 25
0.3 A 42 V 80% – 95% 0.4″ × 0.5″ $8.49

Subcategories

These powerful synchronous buck voltage regulators take input voltages up to 50 V and efficiently reduce them to a lower fixed output voltage while allowing for typical continuous output currents between 2 A and 9 A, depending on the combination of input and output voltage.

These compact synchronous buck voltage regulators take input voltages up to 50 V and efficiently reduce them to a lower fixed output voltage while allowing for typical continuous output currents between 2 A and 4 A, depending on the combination of input and output voltage.

These compact synchronous buck voltage regulators take input voltages up to 45 V and efficiently reduce them to a lower fixed output voltage while allowing for typical continuous output currents between 2 A and 4 A, depending on the combination of input and output voltage.

These compact synchronous, switching step-down voltage regulators generate lower output voltages from input voltages as high as 36 V. They offer typical efficiencies of 85% to 95% and continuous output currents over 2 A.

This family of small switching step-down voltage regulators efficiently generates lower output voltages from input voltages as high as 50 V with a maximum current of 600 mA. They have low dropout voltages. Various fixed-voltage and adjustable-output versions are available.

These powerful synchronous buck voltage regulators take input voltages up to 40 V and efficiently reduce them to a lower fixed output voltage while allowing for an available output current of around 15 A.

These compact synchronous buck voltage regulators take input voltages up to 36 V and reduce them to a lower fixed output voltage while allowing for a maximum output current of 1 A. They offer very high efficiency and very low dropout voltages.

These compact synchronous buck voltage regulators take input voltages up to 36 V and reduce them to a lower fixed output voltage while allowing for a maximum output current of 500 mA. They offer very high efficiency and very low dropout voltages.

These compact synchronous, switching step-down voltage regulators generate lower output voltages from input voltages as high as 38 V. They offer typical efficiencies of 80% to 95% and continuous output currents up to 2.5 A.

This family of small switching step-down voltage regulators efficiently generates lower output voltages from input voltages as high as 42 V with a maximum current of 600 mA.

This family of small switching step-down voltage regulators efficiently generates lower output voltages from input voltages as high as 42 V with a maximum current of 300 mA.


Products in category “Step-Down (Buck) Voltage Regulators”

Pololu item #: 2851
Brand: Pololu supply outlook
Status: Rationed (Active) 
RoHS 3 compliant
Out of stock.
Quantity:

This small synchronous switching step-down (or buck) regulator takes an input voltage of up to 38 V and efficiently reduces it to 5 V. The board measures only 0.7″ × 0.8″, but it allows a typical continuous output current of up to 5 A. Typical efficiencies of 85% to 95% make this regulator well suited for high-power applications like powering motors or servos. High efficiencies are maintained at light loads by dynamically changing the switching frequency, and an optional shutdown pin enables a low-power state with a current draw of a few hundred microamps.

Pololu item #: 2866
Brand: Pololu supply outlook
Status: Rationed (Active) 
RoHS 3 compliant
Out of stock.
Quantity:

This synchronous switching step-down (or buck) regulator takes an input voltage of up to 38 V and efficiently reduces it to 5 V with an available output current of around 9 A. Typical efficiencies of 80% to 95% make this regulator well suited for higher-power applications like powering motors or servos, while high efficiencies are maintained at light loads by dynamically changing the switching frequency, and an optional shutdown pin enables a low-power state with a current draw of a few hundred microamps. The regulator’s output voltage setting can also be lowered by adding an external resistor.

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