The D36V50Fx family of buck (step-down) voltage regulators generates lower output voltages from input voltages as high as 50 V. They are switching regulators (also called switched-mode power supplies (SMPS) or DC-to-DC converters), which makes them much more efficient than linear voltage regulators, especially when the difference between the input and output voltage is large. These regulators can typically support continuous output currents between 2 A and 9 A, depending on the input voltage and output voltage (see the Maximum continuous output current section below). In general, the available output current is a little higher for the lower-voltage versions than it is for the higher-voltage versions, and it decreases as the input voltage increases.
This family includes six versions with fixed output voltages ranging from 3.3 V to 12 V:
The regulators have input reverse voltage protection up to 40 V, output undervoltage and overvoltage protection, over-current protection, and short-circuit protection. A thermal shutdown feature also helps prevent damage from overheating and a soft-start feature limits the inrush current and gradually ramps the output voltage on startup.
If you do not need quite as much current, consider the very similar D36V28Fx family of step-down voltage regulators, which can deliver up to 4 A in a wide range of output voltages.
We manufacture these boards in-house at our Las Vegas facility, which gives us the flexibility to make these regulators with customised components to better meet the needs of your project. For example, if you have an application where the input voltage will always be below 20 V and efficiency is very important, we can make these regulators a bit more efficient at high loads by replacing the 40V reverse voltage protection MOSFET with a 20V one. We can also customise the output voltage. If you are interested in customisation, please contact us.
Step-Down Voltage Regulator D36V50Fx, side view.
This regulator has six connections, some of which are duplicated on multiple pins: power good (PG), enable (EN), input voltage (VIN), input voltage after reverse protection (VRP), output voltage (VOUT), and ground (GND).
The “power good” indicator, PG, is an open-drain output that goes low when the regulator’s output voltage either rises more than 20% above or falls more than 10% below the nominal voltage (with hysteresis).
The EN pin is pulled up to reverse-protected VIN by a 100 kΩ resistor, which enables the regulator’s output by default. The EN pin can be driven low (under 0.4 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 10 µA and 20 µA per volt on VIN when EN is held low. If you do not need this feature, you can leave the EN pin disconnected.
The input voltage, VIN, powers the regulator. Voltages between 4.5 V and 50 V can be applied to VIN, but generally the effective lower limit of VIN is VOUT plus the regulator’s dropout voltage, which varies approximately linearly with the load (see below for graphs of the dropout voltage as a function of the load).
VRP provides access to the input voltage after reverse-voltage protection; this can be used as an output to power other devices, or the input voltage can be connected to VRP instead of VIN to bypass the reverse protection.
VOUT is the regulated output voltage.
All of the connections are arranged on a 0.1″ grid for compatibility with solderless breadboards, connectors, and other prototyping arrangements that use a 0.1″ grid. The PG connection is the only one not accessible along the edge of the board. A 1×12 straight male header strip is included with the regulator.
The power connections (VIN, VRP, VOUT, and GND) are duplicated across both rows of through-holes, allowing two header pins to be used for each connection. Note that the EN and PG pins are duplicated and are adjacent on different rows, so if you intend to use the regulator on a breadboard, be careful to avoid installing header pins in a way that shorts EN to PG. (In the picture below, note that the PG pin is omitted to avoid shorting it to EN.)
Each header pin is only rated for 3 A (6 A combined per pair), and solderless breadboards are usually not intended to handle more than a few amps, so for higher-power applications, thick wires should be soldered directly to the board.
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.
The maximum achievable output current of these regulators varies with the input voltage but also depends on other factors, including the ambient temperature, air flow, and heat sinking. The graph below shows maximum output currents that these regulators can deliver continuously at room temperature in still air and without additional heat sinking.
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 quiescent current is the current the regulator uses just to power itself, and the graph below shows this for the different regulator versions as a function of the input voltage. The module’s EN input can be driven low to put the board into a low-power state where it typically draws between 10 µA and 20 µA per volt on VIN.
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. The graph below shows the dropout voltages for the different members of this regulator family:
|Size:||1″ × 1″ × 0.375″1|
|Minimum operating voltage:||13.3 V2|
|Maximum operating voltage:||50 V|
|Continuous output current:||4.5 A3|
|Output voltage:||12 V|
|Reverse voltage protection?:||Y4|
|Maximum quiescent current:||4 mA5|
|Output type:||fixed 12V|
|PCB dev codes:||reg24d|
|Other PCB markings:||0J12574, blank white box|