This synchronous switching step-down (or buck) regulator takes an input voltage of up to 40 V and efficiently reduces it to 3.3 V with an available output current of around 15 A. Typical efficiencies of 80% to 95% along with its high current capabilities make this regulator well suited for powering large loads. The regulator features reverse voltage protection and a power-good output that indicates when the regulator cannot adequately maintain the output voltage.
Overview
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. See the Typical efficiency and output current section at the bottom of this page for more details.
These regulators have a typical quiescent (no load) current draw of around 100 mA, and an enable pin can be used to put the boards in a low-power state that reduces the quiescent current to approximately 5 µA to 10 µA per volt on VIN.
During normal operation, this product can get hot enough to burn you. Even with very light loads, the regulator can run very hot if the input voltage is high, and the higher the input voltage the hotter the regulator will run. Take care when handling this product or other components connected to it.
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.
Dimensions
- Size:1.7? × 1.25? × 0.43?1
- Weight:19 g1
General specifications
- Minimum operating voltage:4.5 V
- Maximum operating voltage:40 V
- Continuous output current:15 A2
- Output voltage:3.3 V
- Reverse voltage protection?:Y
- Maximum quiescent current:100 mA3
Identifying markings
- PCB dev codes:reg18b
- Other PCB markings:0J9727
Notes:
- 1.Without included optional hardware.
- 2.This value is mainly for comparison to our other regulators. Actual achievable continuous output current is a function of input voltage and is limited by thermal dissipation. See the output current graph under the description tab for more information.
- 3.Typical maximum for the higher end of the input voltage range; it is a little lower at lower voltages. The ENABLE pin can be used to reduce the quiescent current to less than 10 ?A per volt on VIN.
