12V, 4.5A Step-Down Voltage Regulator D36V50F12

This powerful synchronous switching step-down (or buck) regulator takes an input voltage of up to 50 V and efficiently reduces it to 12 V. The board measures only 1″ × 1″ yet delivers typical maximum continuous output currents between 2.3 A and 6.5 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.

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.

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

General specifications