Datasheet

ManualsBrandsPololu Manuals5.0 V DC Regulators5V, 300mA Step-Down Voltage Regulator D24V3F5

RB-Pol-219

5V, 300mA Step-Down Voltage Regulator D24V3F5

The compact (0.4″ × 0.5″) D24V3F5 switching step-down (or buck) voltage regulator takes an input

voltage between 7 V and 42 V and efficiently reduces it to 5 V while allowing for a maximum output

current of 300 mA. The pins have a 0.1″ spacing, making this board compatible with standard

solderless breadboards and perfboards.

Overview

These buck (step-down) voltage regulators generate lower output voltages from input voltages as high

as 42 V. They are switching regulators (also called switched-mode power supplies (SMPS) or DC-to-

DC converters) and have a typical efficiency between 80% to 90%, which is much more efficient than

linear voltage regulators, especially when the difference between the input and output voltage is large.

This regulator is available with a fixed 3.3 V, 5 V, 9 V, or 12 V output, and two versions are available

for each voltage, one with a 300 mA maximum output current (D24V3Fx) and one with a 600 mA

maximum output current (D24V6Fx).

The regulator has short-circuit protection, and thermal shutdown prevents damage from overheating.

The board does not have reverse-voltage protection.

Summary of content (6 pages)

PAGE 1
RB-Pol-219 5V, 300mA Step-Down Voltage Regulator D24V3F5 The compact (0.4″ × 0.5″) D24V3F5 switching step-down (or buck) voltage regulator takes an input voltage between 7 V and 42 V and efficiently reduces it to 5 V while allowing for a maximum output current of 300 mA. The pins have a 0.1″ spacing, making this board compatible with standard solderless breadboards and perfboards. Overview These buck (step-down) voltage regulators generate lower output voltages from input voltages as high as 42 V.
PAGE 2
If you need more output current, consider our D15V35F5S3 and D15V70F5S3 3.3V/5V step-down voltage regulators, which can typically deliver a continuous 3.5 A and 7 A, respectively. Features • Input voltage: [output voltage + dropout voltage] to 42 V (see below for more information on dropout voltage) • Fixed 3.
PAGE 3
The SHDN pin can be driven low (under 0.3 V) to turn off the output and put the board into a lowpower state that typically draws 20 μA. The SHDN pin can be driven high (above 2.3 V) to enable the board, or it can be connected to VIN or left disconnected if you want to leave the board permanently enabled.
PAGE 4
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 graphs below, this switching regulator typically has an efficiency of 80% to 90%. Note that the above graphs apply to both the 300 mA and 600 mA versions, which is why the x axis extends to 600 mA. You should not expect to get more than 300 mA from the 300 mA versions (D24V3Fx).
PAGE 5
As you can see from the last two graphs, the dropout voltage of the low-current 9 V and 12 V versions (D24V3F9 and D24V3F12) spikes as the output current nears the 300 mA limit. LC Voltage Spikes When connecting voltage to electronic circuits, the initial rush of current can cause voltage spikes that are much higher than the input voltage. If these spikes exceed the regulator’s maximum voltage (42 V), the regulator can be destroyed.
PAGE 6
Specifications Dimensions • Size: 0.4" × 0.5" × 0.1" • Weight: 0.