Pololu 5V 5A Step-Down Voltage Regulator D24V50F5

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.

The available output current is a function of the input voltage and efficiency (see the Typical Efficiency and Output Current section below), but the input current can typically be as high as 5 A. The regulator has a typical quiescent current draw of less than 1 mA, and the ENABLE pin can be used to put the board in a low-power state that reduces the quiescent current to approximately 10 µA to 20 µA per volt on VIN.

This regulator has built-in reverse-voltage protection, short-circuit protection, thermal shutdown, a soft-start feature that reduces inrush current, and an under-voltage lockout.

Features

  • Input voltage: 6 V 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)
  • Typical maximum continuous output current: 5 A
  • Integrated reverse-voltage protection, over-current protection, over-temperature shutoff, soft-start, and under-voltage lockout
  • Typical efficiency of 85% to 95%, depending on input voltage and load; the switching frequency automatically changes at light loads to maintain high efficiencies
  • 700 μA typical no-load quiescent current; can be reduced to 10 µA to 20 µA per volt on VIN by disabling the board
  • Compact size: 0.7″ × 0.8″ × 0.35″ (17.8 mm × 20.3 mm × 8.8 mm)
  • Two 0.086″ mounting holes for #2 or M2 screws

Using the regulator

Connections

This boost regulator has four different connections: input voltage (VIN), ground (GND), output voltage (VOUT) and enable (EN).

D24V50F5 pinout

The input voltage, VIN, powers the regulator and can be supplied with voltages up to 38 V. The effective lower limit of VIN is VOUT plus the regulator’s dropout voltage, which varies approximately linearly with the load from around 700 mV to around 1.5 V (see below for a graph of the dropout voltages as a function of the load).

The regulator is enabled by default: a 100 kΩ pull-up resistor on the board connects the ENABLE pin to reverse-protected VIN. The ENABLE pin can be driven low (under 0.6 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 ENABLE to VIN and by the reverse-voltage protection circuit, which will draw between 10 µA and 20 µA per volt on VIN when ENABLE is held low. If you do not need this feature, you should leave the ENABLE pin disconnected.

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 85% to 95% for most combinations of input voltage, and load.

D24V50F5 Efficiency

The 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.

During normal operation, this product can get hot enough to burn you. Take care when handling this product or other components connected to it.

Typical dropout voltage

The dropout voltage of a step-down regulator is the minimum amount by which the input voltage must exceed the regulator’s target output voltage in order to ensure the target output can be achieved. For example, if a 5 V regulator has a 1 V dropout voltage, the input must be at least 6 V to ensure the output is the full 5 V. The following graph shows the dropout voltages for the D24V50F5 regulator as a function of the output current:

D24V50F5 Dropout Voltage

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Pololu 5V 5A Step-Down Voltage Regulator D24V50F5

  • Manufacturer: Pololu
  • Product Code: D24V50F5
  • Availability:  7 - 10 days
  • £19.14

  • Ex Tax: £15.95

Pololu

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Tags: 5V, 5A, Step-Down, step, down, fixed, Voltage, Regulator, D24V50F5, 2851 Pololu