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 A to 20 A 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.

Features:

• 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
• Typical efficiency of 80% to 95%, depending on input voltage, output voltage, and load
• 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
• Enable input with precise cutoff threshold for disconnecting the load and putting the regulator into a low-power state that draws approximately 10 A to 20 A 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: 25.4 mm 25.4 mm 9.5 mm
• Three 0.086? mounting holes for #2 or M2 screws

Specifications:

• Minimum operating voltage: 4.5 V
• Maximum operating voltage: 50 V
• Continuous output current: 6.5 A
• Output voltage: 3.3 V
• Reverse voltage protection?: Y
• Maximum quiescent current: 4 mA
• Output type: fixed 3.3V