Pololu 9V, 2.5A Step-Down Voltage Regulator D24V25F9

Pololu Pololu 9V, 2.5A Step-Down Voltage Regulator D24V25F9
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Price: £8.64
(£7.20 + VAT)
Stock Quantity: 10
Model: D24V25F9
Manufacturer: Pololu
Average Rating: Not Rated

Pololu

Pololu 9V, 2.5A Step-Down Voltage Regulator D24V25F9

This small synchronous switching step-down (or buck) regulator takes an input voltage of up to 38 V and efficiently reduces it to 9 V. The board measures only 0.7″ × 0.7″, but it allows a typical continuous output current of up to 2.5 A. Typical efficiencies of 85% to 95% make this regulator well suited for powering moderate loads like sensors or small motors. 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.

At light loads, the switching frequency automatically changes to maintain high efficiencies. These regulators have a typical quiescent (no load) current draw of less than 1 mA, and the ENABLE pin can be used to put the boards in a low-power state that reduces the quiescent current to approximately 10 µA to 20 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, a soft-start feature that reduces inrush current, and an under-voltage lockout.

Features

  • Input voltage:
    • 10 V to 38 V
    • [output voltage + dropout voltage] to 38V (see below for more information on dropout voltage)
  • Fixed 9 V output with 4% accuracy
  • Typical maximum continuous output current: 2.5 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
  • Typical no-load quiescent current under 1 mA; can be reduced to 10 µA to 20 µA per volt on VIN by disabling the board
  • Compact size: 0.7″ × 0.7″ × 0.35″ (17.8 mm × 17.8 mm × 8.8 mm)
  • Two 0.086″ mounting holes for #2 or M2 screws

Using the regulator

Connections

This buck regulator has five connection points for four different connections: enable (EN), input voltage (VIN), 2x ground (GND), and output voltage (VOUT).

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. This family of switching regulators typically has an efficiency of 85% to 95%, though the actual efficiency in a given system depends on input voltage, output voltage, and output current. See the efficiency graph near the bottom of this page for more information.

The maximum achievable output current is typically around 2.5 A, but this depends on many factors, including the ambient temperature, air flow, heat sinking, and the input and output voltage.

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. Generally speaking, the dropout voltage increases as the output current increases. See the “Details” section below for more information on the dropout voltage for this specific regulator version.

Switching frequency and behavior under light loads

The regulator generally operates at a switching frequency of around 600 kHz, but the frequency drops when encountering a light load to improve efficiency. This could make it harder to filter out noise on the output caused by switching.

Efficiency and Dropout Voltage Graphs

The graphs below show the typical efficiency and dropout voltage of the 9 V D24V25F9 regulator as a function of the output current:

Regulator Efficiency

Dropout 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.

The over-current limit of the regulator operates on a combination of current and temperature: the current threshold decreases as the regulator temperature goes up. However, there might be some operating points at low input voltages and high output currents (well over 2.5 A) where the current is just under the limit and the regulator might not shut off before damage occurs. If you are using this regulator in an application where the input voltage is near the lower limit and the load could exceed 3.5A for sustained periods (more than five seconds), consider using additional protective components such as fuses or circuit breakers.

 

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Pololu 9V, 2.5A Step-Down Voltage Regulator D24V25F9
Click to enlarge
Pololu 9V, 2.5A Step-Down Voltage Regulator D24V25F9
Click to enlarge
Pololu 9V, 2.5A Step-Down Voltage Regulator D24V25F9
Click to enlarge
Pololu 9V, 2.5A Step-Down Voltage Regulator D24V25F9
Click to enlarge
Pololu 9V, 2.5A Step-Down Voltage Regulator D24V25F9
Click to enlarge
Pololu 9V, 2.5A Step-Down Voltage Regulator D24V25F9
Click to enlarge
Pololu 9V, 2.5A Step-Down Voltage Regulator D24V25F9
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