DC-DC Buck Converter, 18V to 12V, 15A/20A

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$156.99

18V DC to 12V DC buck converter accepts 17–36V DC input and supplies regulated 12V output at 15A or 20A. Featuring up to 94% efficiency, IP68 waterproof protection, ±1% voltage regulation, and 180W or 240W power ratings, it suits automotive electronics and other 12V DC applications.

Output Current *

15A
20A [+$18.00]

SKU: ATO-DCDC-1812

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Delivery date: 6-12 days

Overview
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The 18V DC to 12V DC step down converter converts variable DC input into a regulated 12V supply for automotive electronics, vehicle accessories, LED lighting, and other 12V DC equipment. Two models are available: ATO-18S1215 rated at 15A and ATO-18S1220 rated at 20A. Compact sealed enclosures support installation in space-constrained environments, while natural heat dissipation eliminates the need for a separate cooling fan.

Specification

Model		ATO-18S1215	ATO-18S1220
Input	Rated voltage	18V DC
	Voltage range	17-36V DC
	Efficiency	92%	94%
	Wiring Type	16 AWG Wire (Red Positive, Black Negative)	14 AWG Wire (Red Positive, Black Negative)
Output	Voltage	12V DC
	Max. rated current	15A	20A
	Max. rated power	180W	240W
	Voltage regulation	<1%
	Load regulation	<2%
	No load loss	25mA
	Ripple & noise	220mVpp	90mVpp
	Wiring Type	14 AWG Wire (Yellow Positive, Black Negative)	14 AWG Wire (Yellow Positive, Black Negative)
Environment	Working temperature	-40℃~+80℃
Function	Waterproof	IP68
Function	Cooling Method	Natural heat dissipation through the enclosure
Mechanical	Weight	≤ 300g	490g
Mechanical	Size	747432mm	1008039mm

Feature

Wide Input Voltage Range: The step down converter accepts 17–36V DC input, making it suitable for 18V nominal power systems and other compatible DC sources.
Stable 12V DC Output: Maintains voltage regulation within 1% and load regulation within 2% for consistent power delivery to connected equipment.
Two Output Current Options: Choose the 15A DC-DC buck converter rated at 180W or the 20A buck converter rated at 240W to match different load requirements.
High Conversion Efficiency: Achieves 92% efficiency in the ATO-18S1215 model and 94% in the ATO-18S1220 model, helping reduce conversion losses.
IP68 Waterproof Protection: The sealed enclosure supports the DC-DC buck converter installation in demanding environments where exposure to water and moisture is a concern.
Compact, Fanless Construction: Uses natural heat dissipation through the enclosure, with compact dimensions of 74 × 74 × 32mm or 100 × 80 × 39mm, depending on the model.

Detail

Size(unit: mm)

ATO-18S1215

18v to 12v dc dc step down converter size

ATO-18S1220

18V to 12V DC-DC step down converter size

Tips: What equipment can an 18V DC to 12V DC buck converter power?

The 18V DC to 12V DC step down converter supplies regulated 12V DC power to compatible vehicle accessories, LED lighting, communication devices, and other electronic equipment. The ATO-18S1215 supports up to 15A (180W), while the ATO-18S1220 supports up to 20A (240W). Before installation, check the device's voltage, current, and power requirements to ensure they fall within the converter's rated limits.

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