Step-Down 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 table shows some of the key stats for the regulators in this category. Newer products are at the top of the table and are generally preferred:

Regulator Output voltage Max output current Max input voltage Typical efficiency Size Price
#2866: D24V90F5 5 V 9 A 38 V 80% – 95% 0.8″ × 1.6″ $27.95
#2865: D24V60F5 5 V 6 A 38 V 80% – 95% 0.8″ × 1.6″ $19.95
#2840: D24V5F1 1.8 V 0.5 A 36 V 75% – 90% 0.4″ × 0.5″ $4.95
#2841: D24V5F2 2.5 V 0.5 A 36 V 80% – 90% 0.4″ × 0.5″ $4.95
#2842: D24V5F3 3.3 V 0.5 A 36 V 80% – 90% 0.4″ × 0.5″ $4.95
#2843: D24V5F5 5 V 0.5 A 36 V 85% – 90% 0.4″ × 0.5″ $4.95
#2844: D24V5F6 6 V 0.5 A 36 V 85% – 93% 0.4″ × 0.5″ $4.95
#2845: D24V5F9 9 V 0.5 A 36 V 85% – 93% 0.4″ × 0.5″ $4.95
#2846: D24V5F12 12 V 0.5 A 36 V 85% – 93% 0.4″ × 0.5″ $4.95
#2847: D24V5F15 15 V 0.5 A 36 V 90% – 95% 0.4″ × 0.5″ $4.95
#2111: D15V70F5S3 3.3 V or 5 V 7 A 24 V 85% – 95% 0.6″ × 1.9″ $24.95
#2110: D15V35F5S3 3.3 V or 5 V 3.5 A 24 V 85% – 95% 0.46″ × 1.68″ $14.95
#2097: D24V3F3 3.3 V 0.3 A 42 V 80% – 90% 0.4″ × 0.5″ $3.95
#2098: D24V3F5 5 V 0.3 A 42 V 80% – 90% 0.4″ × 0.5″ $3.95
#2099: D24V3F9 9 V 0.3 A 42 V 85% – 95% 0.4″ × 0.5″ $3.95
#2100: D24V3F12 12 V 0.3 A 42 V 85% – 95% 0.4″ × 0.5″ $3.95
#2106: D24V6F3 3.3 V 0.6 A 42 V 80% – 90% 0.4″ × 0.5″ $5.95
#2107: D24V6F5 5 V 0.6 A 42 V 80% – 90% 0.4″ × 0.5″ $5.95
#2108: D24V6F9 9 V 0.6 A 42 V 85% – 95% 0.4″ × 0.5″ $5.95
#2109: D24V6F12 12 V 0.6 A 42 V 90% – 95% 0.4″ × 0.5″ $5.95
#2103: D24V6ALV 2.5 V – 7.5 V 0.6 A 42 V 70% – 85% 0.4″ × 0.6″ $9.95
#2101: D24V3ALV 2.5 V – 7.5 V 0.3 A 42 V 70% – 85% 0.4″ × 0.6″ $7.95
#2104: D24V6AHV 4 V – 25 V 0.6 A 42 V 75% – 90% 0.4″ × 0.6″ $9.95
#2102: D24V3AHV 4 V – 25 V 0.3 A 42 V 75% – 90% 0.4″ × 0.6″ $7.95
#2177: 5V 3A BEC 5 V 3 A 23 V 75% – 95% 0.4″ × 0.6″ × 1.6″ $11.95


Products in category “Step-Down Voltage Regulators”

Pololu item #: 2866
Price: $27.95
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 while allowing a typical continuous output current of up to 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.

Pololu item #: 2865
Price: $19.95
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 while allowing a typical continuous output current of up to 6 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.

Pololu item #: 2840
Price: $4.95
Quantity:

The compact (0.4″ × 0.5″) D24V5F1 synchronous buck voltage regulator takes input voltages between 3 V and 36 V and efficiently reduces them to 1.8 V while allowing for a maximum output current of 500 mA. This regulator offers typical efficiencies between 75% and 90%. The pins have a 0.1″ spacing, making this board compatible with standard solderless breadboards and perfboards.

Pololu item #: 2841
Price: $4.95
Quantity:

The compact (0.4″ × 0.5″) D24V5F2 synchronous buck voltage regulator takes input voltages between 3 V and 36 V and efficiently reduces them to 2.5 V while allowing for a maximum output current of 500 mA. This regulator offers typical efficiencies between 80% and 90%. The pins have a 0.1″ spacing, making this board compatible with standard solderless breadboards and perfboards.

Pololu item #: 2842
Price: $4.95
Quantity:

The compact (0.4″ × 0.5″) D24V5F3 synchronous buck voltage regulator takes an input voltage of up to 36 V and efficiently reduces it to 3.3 V while allowing for a maximum output current of 500 mA. This regulator offers typical efficiencies between 80% and 90% and has a very low dropout, so it can be used with input voltages as low as a few hundred millivolts above 3.3 V. The pins have a 0.1″ spacing, making this board compatible with standard solderless breadboards and perfboards.

Pololu item #: 2843
Price: $4.95
Quantity:

The compact (0.4″ × 0.5″) D24V5F5 synchronous buck voltage regulator takes an input voltage of up to 36 V and efficiently reduces it to 5 V while allowing for a maximum output current of 500 mA. This regulator offers typical efficiencies between 85% and 90% and has a very low dropout, so it can be used with input voltages as low as a few hundred millivolts above 5 V. The pins have a 0.1″ spacing, making this board compatible with standard solderless breadboards and perfboards.

Pololu item #: 2844
Price: $4.95
Quantity:

The compact (0.4″ × 0.5″) D24V5F6 synchronous buck voltage regulator takes an input voltage of up to 36 V and efficiently reduces it to 6 V while allowing for a maximum output current of 500 mA. This regulator offers typical efficiencies between 85% and 93% and has a very low dropout, so it can be used with input voltages as low as a few hundred millivolts above 6 V. The pins have a 0.1″ spacing, making this board compatible with standard solderless breadboards and perfboards.

Pololu item #: 2845
Price: $4.95
Quantity:

The compact (0.4″ × 0.5″) D24V5F9 synchronous buck voltage regulator takes an input voltage of up to 36 V and efficiently reduces it to 9 V while allowing for a maximum output current of 500 mA. This regulator offers typical efficiencies between 85% and 93% and has a very low dropout, so it can be used with input voltages as low as a few hundred millivolts above 9 V. The pins have a 0.1″ spacing, making this board compatible with standard solderless breadboards and perfboards.

Pololu item #: 2846
Price: $4.95
Quantity:

The compact (0.4″ × 0.5″) D24V5F12 synchronous buck voltage regulator takes an input voltage of up to 36 V and efficiently reduces it to 12 V while allowing for a maximum output current of 500 mA. This regulator offers typical efficiencies between 85% and 93% and has a very low dropout, so it can be used with input voltages as low as a few hundred millivolts above 12 V. The pins have a 0.1″ spacing, making this board compatible with standard solderless breadboards and perfboards.

Pololu item #: 2847
Price: $4.95
Quantity:

The compact (0.4″ × 0.5″) D24V5F15 synchronous buck voltage regulator takes an input voltage of up to 36 V and efficiently reduces it to 15 V while allowing for a maximum output current of 500 mA. This regulator offers typical efficiencies between 90% and 95% and has a very low dropout, so it can be used with input voltages as low as a few hundred millivolts above 15 V. The pins have a 0.1″ spacing, making this board compatible with standard solderless breadboards and perfboards.

Pololu item #: 2111
Price: $24.95
Quantity:

The compact (1.9"×0.6") D15V70F5S3 switching step-down (or buck) voltage regulator takes an input voltage between 4.5 V and 24 V and efficiently reduces it to a lower, user-selectable voltage. The selectable output voltages are 5 V and 3.3 V, and it can deliver 7 A continuous in typical applications.

Pololu item #: 2110
Price: $14.95
Quantity:

The compact (1.68"×0.46") D15V35F5S3 switching step-down (or buck) voltage regulator takes an input voltage between 4.5 V and 24 V and efficiently reduces it to a lower, user-selectable voltage. The selectable output voltages are 5 V and 3.3 V, and it can deliver up to 3.5 A continuous in typical applications.

Pololu item #: 2097
Price: $3.95
Quantity:

The compact (0.4″ × 0.5″) D24V3F3 switching step-down (or buck) voltage regulator takes an input voltage between 4.3 V and 42 V and efficiently reduces it to 3.3 V while allowing for a maximum output current of 300 mA. The pins have a 0.1″ spacing, making this board compatible with standard solderless breadboards and perfboards.

Pololu item #: 2098
Price: $3.95
Quantity:

The compact (0.4″ × 0.5″) D24V3F5 switching step-down (or buck) voltage regulator takes an input voltage between 7 V and 42 V and efficiently reduces it to 5 V while allowing for a maximum output current of 300 mA. The pins have a 0.1″ spacing, making this board compatible with standard solderless breadboards and perfboards.

Pololu item #: 2099
Price: $3.95
Quantity:

The compact (0.4″ × 0.5″) D24V3F9 switching step-down (or buck) voltage regulator takes an input voltage between 11 V and 42 V and efficiently reduces it to 9 V while allowing for a maximum output current of 300 mA. The pins have a 0.1″ spacing, making this board compatible with standard solderless breadboards and perfboards.

Pololu item #: 2100
Price: $3.95
Quantity:

The compact (0.4″ × 0.5″) D24V3F12 switching step-down (or buck) voltage regulator takes an input voltage between 14.5 V and 42 V and efficiently reduces it to 12 V while allowing for a maximum output current of 300 mA. The pins have a 0.1″ spacing, making this board compatible with standard solderless breadboards and perfboards.

Pololu item #: 2106
Price: $5.95
Quantity:

The compact (0.4″ × 0.5″) D24V6F3 switching step-down (or buck) voltage regulator takes an input voltage between 4.8 V and 42 V and efficiently reduces it to 3.3 V while allowing for a maximum output current of 600 mA. The pins have a 0.1″ spacing, making this board compatible with standard solderless breadboards and perfboards.

Pololu item #: 2107
Price: $5.95
Quantity:

The compact (0.4″ × 0.5″) D24V6F5 switching step-down (or buck) voltage regulator takes an input voltage between 7 V and 42 V and efficiently reduces it to 5 V while allowing for a maximum output current of 600 mA. The pins have a 0.1″ spacing, making this board compatible with standard solderless breadboards and perfboards.

Pololu item #: 2108
Price: $5.95
Quantity:

The compact (0.4″ × 0.5″) D24V6F9 switching step-down (or buck) voltage regulator takes an input voltage between 11.5 V and 42 V and efficiently reduces it to 9 V while allowing for a maximum output current of 600 mA. The pins have a 0.1″ spacing, making this board compatible with standard solderless breadboards and perfboards.

Pololu item #: 2109
Price: $5.95
Quantity:

The compact (0.4″ × 0.5″) D24V6F12 switching step-down (or buck) voltage regulator takes an input voltage between 15 V and 42 V and efficiently reduces it to 12 V while allowing for a maximum output current of 600 mA. The pins have a 0.1″ spacing, making this board compatible with standard solderless breadboards and perfboards.

Pololu item #: 2103
Price: $9.95
Quantity:

The compact (0.4″ × 0.6″) D24V6ALV switching step-down (or buck) voltage regulator takes an input voltage between 4.5 V and 42 V and efficiently reduces it to a lower, user-adjustable voltage. It has a output voltage range of 2.5 V to 7.5 V and a maximum output current of 600mA. The pins have a 0.1″ spacing, making this board compatible with standard solderless breadboards and perfboards.

Pololu item #: 2101
Price: $7.95
Quantity:

The compact (0.4″ × 0.6″) D24V3ALV switching step-down (or buck) voltage regulator takes an input voltage between 4.5 V and 42 V and efficiently reduces it to a lower, user-adjustable voltage. It has a output voltage range of 2.5 V to 7.5 V and a maximum output current of 300mA. The pins have a 0.1″ spacing, making this board compatible with standard solderless breadboards and perfboards.

Pololu item #: 2104
Price: $9.95
Quantity:

The compact (0.4″ × 0.6″) D24V6AHV switching step-down (or buck) voltage regulator takes an input voltage between 4.5 V and 42 V and efficiently reduces it to a lower, user-adjustable voltage. It has a output voltage range of 4 V to 25 V and a maximum output current of 600mA. The pins have a 0.1″ spacing, making this board compatible with standard solderless breadboards and perfboards.

Pololu item #: 2102
Price: $7.95
Quantity:

The compact (0.4″ × 0.6″) D24V3AHV switching step-down (or buck) voltage regulator takes an input voltage between 4.5 V and 42 V and efficiently reduces it to a lower, user-adjustable voltage. It has a output voltage range of 4 V to 25 V and a maximum output current of 300mA. The pins have a 0.1″ spacing, making this board compatible with standard solderless breadboards and perfboards.

Pololu item #: 2177
Price: $11.95
Quantity:

This switching step-down (or buck) voltage regulator takes an input voltage of up to 23 V and reduces it to 5 V with a maximum output current of 3 A. It has 22-AWG input leads with stripped and tinned terminations and a 3-pin “JR”-style servo connector on the output lead.