342855 2855 - Pololu 12V, 2.2A Step-Down Voltage Regulator D24V22F12

2855 - Pololu 12V, 2.2A Step-Down Voltage Regulator D24V22F12

This small synchronous switching step-down (or buck) regulator takes an input voltage of up to 36 V and efficiently reduces it to 12 V. The board measures only 0.7″ × 0.7″ yet delivers a typical continuous output current of up to 2.2 A and features reverse voltage protection.
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This small synchronous switching step-down (or buck) regulator takes an input voltage of up to 36 V and efficiently reduces it to 12 V. The board measures only 0.7″ × 0.7″ yet delivers a typical continuous output current of up to 2.2 A and features reverse voltage protection. Typical efficiencies of 90% to 95% make this regulator well suited for powering moderate loads like sensors or small motors. An optional shutdown pin enables a low-power state with a current draw of around 50 μA to 350 μA, depending on the input voltage, and a power-good output indicates when the regulator cannot adequately maintain the output voltage.

The D24V22F12 step-down voltage regulator generates lower output voltages from input voltages as high as 36 V. It is a synchronous switching regulator (also called a switched-mode power supply (SMPS) or DC-to-DC converter) with typical efficiencies of 90% to 95%, which is much more efficient than linear voltage regulators, especially when the difference between the input and output voltage is large. The available output current is a function of the input voltage and efficiency (see the Typical efficiency and output currentsection below), but the output current can typically be as high as 2.2 A.

These regulators have a typical quiescent (no load) current draw of around 1 mA, and an enable pin can be used to put the boards in a low-power state that reduces the quiescent current to approximately 5 µA to 10 µA per volt on VIN.

The modules have built-in reverse-voltage protection, short-circuit protection, a thermal shutdown feature that helps prevent damage from overheating, and a soft-start feature that reduces inrush current.

Features

  • Supports input voltages up to 36 V
  • Fixed 12 V output with 4% accuracy
  • Typical maximum continuous output current: 2.2 A
  • Typical efficiency of 90% to 95%, depending on input voltage and load
  • Dropout voltage ranges from ~0.6 V at no load to ~1.1 V at 2.2 A (see below for more information on dropout voltage)
  • Switching frequency: ~400 kHz
  • Integrated reverse-voltage protection, over-current protection, over-temperature shutoff, and soft-start
  • 1 mA typical no-load quiescent current; this can be reduced to approximately 5 µA to 10 µA per volt on VIN by disabling the board
  • “Power good” output indicates when the regulator cannot adequately maintain the output voltage
  • Compact size: 0.7″ × 0.7″ × 0.31″ (17.8 mm × 17.8 mm × 8 mm)
  • Two 0.086″ mounting holes for #2 or M2 screws

Using the regulator

Connections

This buck regulator has five main connection points for five different electrical nodes: power good (PG), enable (EN), input voltage (VIN), ground (GND), and output voltage (VOUT). The board also features a second ground connection point off the main row of connections that might be convenient for applications where you are soldering wires directly to the board rather than using it in a breadboard.

The input voltage, VIN, powers the regulator. Voltages up to 36 V can be applied to VIN. The effective lower limit of VIN is 12 V plus the regulator’s dropout voltage, which varies approximately linearly with the load (see below for a graph of dropout voltages as a function of the load).

The output voltage, VOUT, is fixed at 12 V.

The regulator is enabled by default: a 270 kΩ pull-up resistor on the board connects the EN pin to reverse-protected VIN. The EN pin can be driven low (under 1 V) to put the board into a low-power state. The quiescent current draw in this sleep mode is dominated by the current in the pull-up resistor from EN to VIN and by the reverse-voltage protection circuit, which altogether will draw between 5 µA and 10 µA per volt on VIN when EN is held low (~50 μA at 13 V in to ~350 μA at 36 V in). If you do not need this feature, you should leave the EN pin disconnected.

The “power good” indicator, PG, is an open-drain output that goes low when the regulator’s output voltage falls below around 10 V and becomes high-impedance when the output voltage rises above around 11 V. An external pull-up resistor is required to use this pin.

Dimensions

Size: 0.7″ × 0.7″ × 0.31″1
Weight: 2.3 g1

General specifications

Minimum operating voltage: 12.7 V2
Maximum operating voltage: 36 V
Continuous output current: 2.2 A3
Output voltage: 12 V
Reverse voltage protection?: Y
Maximum quiescent current: 4 mA4

Identifying markings

PCB dev codes: reg19a
Other PCB markings: 0J9251

Notes:

1 Without included optional headers.
2 For small loads; this voltage rises approximately linearly up to around 13.1 V at 2.2 A output.
3 Typical. Actual continuous output current limited by thermal dissipation.
4 Typical worst case; quiescent current is typically around 1 mA for most of the operating range. The ENABLE pin can be used to reduce the quiescent current to less than 10 μA per volt on VIN.

Specifications

Part. No. : 2855

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