D45V1ExFx Step-Down Voltage Regulators

The D45V1Ex line of synchronous buck (step-down) voltage regulators generate lower voltages from input voltages as high as 65 V while delivering up to 100 mA continuous. They are switching regulators with very low quiescent currents (< 30 μA typical), which allows for extra high efficiencies at low currents compared to linear regulators and typical switching regulators. This kind of regulator is also called a switched-mode power supply (SMPS) or DC-to-DC converter.

D45V1ExFx line of step-down voltage regulators: D45V1E2Fx (left) and D45V1E1Fx (right).

D45V1E1Fx step-down voltage regulator basic dimensions with US quarter for size reference.

D45V1E2Fx step-down voltage regulator basic dimensions with US quarter for size reference.

This line consists of the D45V1E1Fx family, which is just 0.3″ × 0.5″ and intended for applications with tighter space constraints, and the larger (0.5″ × 0.6″) D45V1E2Fx family, which features a precision-threshold enable input for turning the regulator off and a power-good output that can be used for sequencing and voltage monitoring.

	Regulator	Output voltage	Input voltage1	Max output current	Size	EN input + PG output	Price
D45V1E1Fx	#5362: D45V1E1F3	3.3 V	3.3 V – 65 V	100 mA	0.3″ × 0.5″	–	$4.69
	#5363: D45V1E1F5	5 V	5 V – 65 V
	#5367: D45V1E1F12	12 V	12 V – 65 V
D45V1E2Fx	#5372: D45V1E2F3	3.3 V	3.3 V – 65 V	100 mA	0.5″ × 0.6″		$4.69
	#5373: D45V1E2F5	5 V	5 V – 65 V
	#5377: D45V1E2F12	12 V	12 V – 65 V
1 Minimum input voltage is subject to dropout voltage considerations; see the dropout voltage section of product pages for more information.

The regulators feature short circuit protection and thermal shutdown protection, which helps prevent damage from overheating. The boards do not have reverse-voltage protection.

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