5V, 9A Step-Down Voltage Regulator D24V90F5

£27.95 inc VAT

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This high-current D24V90F5 Step-Down Voltage Regulator generates a fixed 5V output from an input voltage of up to 38V, with an efficiency of between 80 to 95%. The output current generated is generally calculated by the input voltage and efficiency however you are looking at typical output currents of around 9A.

Featuring a low-power state, engaged by use of the ENABLE pin, this then reduces the quiescent current to approximately 10 µA to 20 µA per volt on VIN. Coupled with a Power good (PG) indicator light, making it really easy to keep on top of your systems power state! Feel free to add an external resistor to further modify the regulators output voltage.

This regulator has built-in reverse-voltage protection, short-circuit protection, thermal shutdown (which typically activates at 160°C), a soft-start feature that reduces inrush current, and an under-voltage lockout that causes the regulator to turn off when the input voltage is below 4.2 V.


  • Input voltage: 5 to 38 V (see below for more details on the regulator’s dropout voltage, which affects the low end of the operating range)
  • Fixed 5 V output (with 4% accuracy); this can be lowered by adding an external resistor between FB and VOUT
  • Typical maximum continuous output current between 4 A and 8 A
  • Integrated reverse-voltage protection, over-current and short-circuit protection, over-temperature shutoff, soft-start, and under-voltage lockout
  • Typical efficiency of 80% to 95%, depending on input voltage and load; the switching frequency automatically changes at light loads to maintain high efficiencies
  • 800 μA typical no-load quiescent current; can be reduced to 10 µA to 20 µA per volt on VIN by disabling the board
  • “Power good” output indicates when the regulator cannot maintain its set output voltage
  • Compact size: 1.6″ × 0.8″ × 0.3″ (40.6 × 20.3 × 7.6 mm)
  • Four 0.086″ mounting holes for #2 or M2 screws
  • Smaller holes for 0.1″ header pins and larger holes for terminal blocks offer several options for connecting to the board

D24V90F5 Included kit

Pololu 5V, 9A Step-Down Voltage Regulator D24V90F5

Typical efficiency and output current

The efficiency of a voltage regulator, defined as (Power out)/(Power in), is an important measure of its performance, especially when battery life or heat are concerns. As shown in the graph below, these switching regulators have an efficiency of 80% to 95% for most combinations of input voltage, and load.

Pololu 5V, 9A Step-Down Voltage Regulator D24V90F5 efficiencyThe maximum achievable output current of the board depends on many factors, including the ambient temperature, air flow, heat sinking, and the input and output voltage. The graph below shows the maximum continuous output current this regulator can deliver with no external heat sinking or added air flow.

Pololu 5V, 9A Step-Down Voltage Regulator D24V90F5 Maximum continuous output

D24V90F5 Documents


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