This powerful synchronous switching step-down (or buck) regulator takes an input voltage from 4.5 V to 50 V and efficiently reduces it to 3.3 V. The board measures only 1″ × 1″ yet delivers typical maximum continuous output currents between 4.5 A and 9.5 A, depending on the input voltage, which makes it well suited for powering moderate to large loads. An optional enable input with a precise cutoff threshold can be used to put the regulator in a low-power state with a current draw of 10 µA to 20 µA per volt on VIN. The regulator also features reverse voltage protection and a power-good output that indicates when the regulator cannot adequately maintain the output voltage.
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.
- Input voltage: 4.5 V to 50 V
- Output voltage: 3.3 V with 4% accuracy
- Typical maximum continuous output current: 4.5 A to 9.5 A (see the maximum continuous output current graph below)
- Typical efficiency of 80% to 95%, depending on input voltage, output voltage, and load (see the efficiency graph below)
- Switching frequency: ~500 kHz under heavy loads
- Power-save mode with ultrasonic operation that increases light load efficiency by reducing switching frequency, but keeps it above the audible range (20 kHz)
- 2 mA to 4 mA typical no-load quiescent current (see the quiescent current graph below)
- Enable input with precise cutoff threshold for disconnecting the load and putting the regulator into a low-power state that draws approximately 10 µA to 20 µA per volt on VIN
- “Power good” output indicates when the regulator cannot adequately maintain the output voltage
- Output undervoltage and overvoltage protection
- Soft-start feature limits inrush current and gradually ramps output voltage
- Integrated reverse-voltage protection up to 40 V, over-current and short-circuit protection, over-temperature shutoff
- Compact size: 1″ × 1″ × 0.375″ (25.4 mm × 25.4 mm × 9.5 mm)
- Three 0.086″ mounting holes for #2 or M2 screws
||1″ × 1″ × 0.375″1
|Minimum operating voltage:
|Maximum operating voltage:
|Continuous output current:
|Reverse voltage protection?:
|Maximum quiescent current:
|PCB dev codes:
|Other PCB markings:
||0J12574, blank white box
- 1 Without included optional headers.
- 2 Typical continuous output current at 36 V in. 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 To -40 V. Connecting supplies over 40 V in reverse can damage the device.
- 4 While enabled with no load. Can be reduced to under 1 mA using the enable pin.