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.
- 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
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.
|Size:||0.7″ × 0.7″ × 0.31″1|
|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|
|PCB dev codes:||reg19a|
|Other PCB markings:||0J9251|
- 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.
|Part. No. :||2855|
Questions on 2855 - Pololu 12V, 2.2A Step-Down Voltage Regulator D24V22F12
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