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The D24V150Fx family of step-down voltage regulators are high-current synchronous switching regulators that generate lower output voltages from input voltages as high as 40 V. These types of regulators are also known as switched-mode power supplies (SMPS) or DC-to-DC converters, and they are much more efficient than linear voltage regulators, especially when the difference between the input and output voltage is large. In particular, the D24V150Fx family of regulators have typical efficiencies of 80% to 95%, depending on factors like input voltage, output voltage, and load.These regulators have an instantaneous current limit of approximately 32 A, but they are limited in the long term to much lower currents by power dissipation and the corresponding temperature rise that induces in the board. The regulators can typically support continuous output currents between 5 A and 20 A without additional cooling (such as with a heat sink or forced airflow), depending on the input voltage and output voltage. 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.The modules have built-in reverse-voltage protection, short-circuit protection, a thermal shutdown feature that helps prevent damage from overheating, and a soft-start feature that reduces inrush current. They also feature undervoltage lockout that disables the regulator if the input voltage falls below about 3.5 V.
- Input voltage: 4.5-40V
- Output voltage: 3.3V(with 4% accuracy)
- Max. continuous output current : 15A
- Integrated reverse-voltage protection, over-current protection, over-temperature shutoff, undervoltage lockout, and soft-start
- Typical efficiency of 80% to 95%, depending on input voltage, output voltage, and load
- Typical no-load quiescent current of 100 mA ; this can be reduced to approximately 5 µA to 10 µA per volt on VIN by disabling the board
- Dimensions: 43.2 mm × 31.8 mm × 11 mm
- Four 0.086″ mounting holes for #2 or M2 screws
- The input voltage, VIN, powers the regulator. Voltages between 4.5 V and 40 V can be applied to VIN, but for versions of the regulator that have an output voltage higher than 4.5 V, the effective lower limit of VIN is VOUT plus the regulator’s dropout voltage, which varies approximately linearly with the load (see below for a graph of dropout voltages as a function of the load).
- The output voltage, VOUT, is fixed to 3.3V
- The regulator’s enable input, EN, is pulled high (to 5 V) internally, which enables the regulator by default. The EN pin can be driven low (under 1 V) to disable the output and put the board into a low-power state. The quiescent current draw in this sleep mode is dominated by the current in an internal pull-up resistor and the reverse-voltage protection circuit, which altogether will draw between 5 µA and 10 µA per volt on VIN when EN is held low. To bring the board out of this low-power state, the EN pin should be pulled above 2 V. If you do not need this feature, you can leave the EN pin disconnected.
- The “power good” indicator, PG, is an open-drain output that goes low when the regulator’s output falls below around 85% of the nominal voltage, including when the enable pin is held low, or rises above around 115% of the nominal voltage. Otherwise, the PG pin is high-impedance, so an external pull-up resistor is required to use this pin.
- The mode input, MOD, is pulled low internally, which selects fixed-frequency operation by default. This pin can be driven high (above 2 V, but not exceeding 5 V) to override fixed-frequency operation to reduce quiescent current (and therefore to increase efficiency) at light loads (on the order of a few milliamps). This reduced-power feature is available when the input voltage is substantially higher than the output voltage (see the item-specific details section at the bottom of this page for more information).