Product Description
Overview
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:
- D36V50F3: Fixed 3.3V output
- D36V50F5: Fixed 5V output
- D36V50F6: Fixed 6V output
- D36V50F7: Fixed 7.5V output
- D36V50F9: Fixed 9V output
- D36V50F12: Fixed 12V output
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.
Features
- Input voltage: 13.3 V to 50 V (minimum input subject to dropout voltage considerations; see the dropout voltage section for details)
- Output voltage: 12 V with 4% accuracy
- Typical maximum continuous output current: 2.3 A to 6.5 A (see the maximum continuous output current graph below)
- Typical efficiency of 90% 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
Dimensions
- Size: 1? × 1? × 0.375?1
- Weight: 7.0 g1
General specifications
- 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
Identifying markings
- PCB dev codes: reg24d
- Other PCB markings: 0J12574, blank white box
Notes:
- 1. Without included optional headers.
- 2. Subject to dropout voltage considerations. See the dropout voltage graph under the description tab for more information.
- 3. 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.
- 4. To -40 V. Connecting supplies over 40 V in reverse can damage the device.
- 5. While enabled with no load. Can be reduced to under 1 mA using the enable pin.
