DC-DC Boost and Buck Converter, 8V-40V to 12V

SKU: PH-DCBBC-8-40S12

$52.53

● DC-DC boost and buck converter supports 8V-40V wide voltage input and output stabilized at 11.9-12.3V with multiple safety mechanisms. ● Built-in 20A fuse, support up to 3A/6A/10A/20A/25A/30A stabilized current output options. ● High efficiency conversion rate up to 89.1%, MTBF over 200,000 hours, suitable for long-term operation system. ● Reasonable price and multiple solutions are suitable for powering a wide range of devices such as routers, motor drives, security monitoring and so on.

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Overview
Specs
Application
FAQ
Reviews

Overview

Boost buck converter for input voltage up to 8V to 40V, with DC-DC auto boost and buck function. High efficiency conversion rate up to 89.1%, even under input fluctuation or high load conditions, can maintain ±1% voltage stability, high current buck boost converter optional 3A/6A/10A/20A/25A/30A, designed for power supply applications requiring stable 12V output.

Feature

Designed according to CE/RoHS, 100% full power, DC-DC converter with high stability output.
Has passed 100% full load aging test, imported components (such as: Black Diamond, TI, Ruby, etc.).
Shockproof aluminum alloy shell, small size, easy installation, built-in over-current, low voltage, over-temperature, short circuit protection.
8-40V wide voltage input, to 12V output, up to 89-95% conversion efficiency.

Details

Die-casting Aluminum Shell: The boost buck converter with this encapsulation method has good heat dissipation function, safe and reliable.
High-quality Organic Silicone: With potting, waterproof, dustproof, shockproof, IP68 waterproof and so on.
Pure Copper with Magnetic Core Inductor: It can effectively play the role of filtering oscillation, trapping, DC converter inductor good or bad directly affect the stability of the power supply.
SMT SMD Technology: Adopting new and high quality electronic components (e.g. TI NCC, NICHICON, NIPPON, etc.). High stability and reliability.

Dimension (unit: mm)

8V-40V to 12V 3A

DC DC boost buck converter 8v-40v 3A dimension

8V-40V to 12V 6A-20A

DC DC boost buck converter 8v-40v 6A dimension

8V-40V to 12V 25A-30A

DC DC boost buck converter 8v-40v 25A dimension

Wiring Diagram

DC DC boost buck converter 5v-36v wiring

Specs

Input
Input Voltage	8-40V
Max. Input Voltage	40V (Continuous)
Undervoltage Shutdown	7.8-8.2V (Automatic Recovery)
Undervoltage Recovery	8.5-8.7V (Automatic Recovery)
Max. Input Current	5.7A (Vin=8.1V; Iout =3A)
No Load Current	54mA (Typ. 51mA; Vin=12V)
Positive Electrode Cable	18 AWG (If the wire length is greater than 50cm, it is recommended to use a thicker wire diameter.)
Negative Electrode Cable
Enable Pin Cable	22 AWG (If the product has this feature)
Fuse	20A (Input positive has built-in fuse)
Output
Efficiency	89.1% (Vin=12V; Iout=3A)
Output Voltage	11.9-12.3V (Vin=12V; Iout=3A)
Regulator Accuracy	±1%
Voltage Regulation
Load Regulation
Overvoltage Protection	/
Output Current	0-3A
Overcurrent Protection	5.7-6.3A (Vin=12V)
External Capacitance	0-4000μF
Output Ripple and Noise	340mVp-p (Vin=8-40V; Iout=3A, Oscilloscope Bandwidth: 20 MHz)
Output Voltage Rise Time	4.0mS
Boot Delay Time	12.8mS
Out Voltage Overshoot	2% (Vin=12V, 50%-75% Load Step)
Over Temperature Protection	/
Short Circuit Protection	Long-term (4 hours) short circuit is notdamaged, Hiccup mode
Positive Electrode Cable	18 AWG (If the wire length is greater than 50cm, it is recommended to use a thicker wire diameter.)
Negative Electrode Cable
Safety and EMC Features
Anti-electric Strength	Input to output: /
	Input to shell: ≥500V (Leakage Current ≤ 3.5mA, 1min,No Breakdown, No Arcing)
	Output to shell: ≥500V (Leakage Current ≤ 3.5mA, 1min,No Breakdown, No Arcing)
Insulation Resistance	Input to output: ≥50MΩ (Test Voltage =500V)
	Input to shell: ≥50MΩ (Test Voltage =500V)
	Output to shell:≥50MΩ (Test Voltage =500V)
Absolute Maximum Ratings
Operating Ambient Temperature	-40-50℃
Shell Ambient Temperature	-40-80℃
Storage Temperature	-55-100℃
Operating Humidity	5-95% (Non-condensing)
Atmospheric Pressure	62-106Kpa
Altitude	4000m
Cooling Way	Natural cooling
Other
Weight	≤120g
Package	White Box
MTBF	≥200000H
Switching Frequency	80±10kHz

Note: This table takes the specification of 8-40V to 12V, 3A as an example, please see the selection table below for 6A/10A/20A/25A/30A specification files.

DC-DC Boost-Buck Converter Model Selection

Output Current/Power: 3A/36W, Efficiency: 89.1%, Size: 645722mm	8V-40V to 12V, 3A DC-DC Boost-Buck Converter User Manual
Output Current/Power: 6A/72W, Efficiency: 90.8%, Size: 747432mm	8V-40V to 12V, 6A DC-DC Boost-Buck Converter User Manual
Output Current/Power: 10A/120W, Efficiency: 90.8%, Size: 747432mm	8V-40V to 12V, 10A DC-DC Boost-Buck Converter User Manual
Output Current/Power: 20A/240W, Efficiency: 96%, Size: 747432mm	8V-40V to 12V, 20A DC-DC Boost-Buck Converter User Manual
Output Current/Power: 25A/300W, Efficiency: 96%, Size: 1008039mm	8V-40V to 12V, 25A DC-DC Boost-Buck Converter User Manual
Output Current/Power: 30A/360W, Efficiency: 96%, Size: 1008039mm	8V-40V to 12V, 30A DC-DC Boost-Buck Converter User Manual

Application

Industrial Equipment

Automotive Equipment

Vehicle LED Advertising

Communication Equipment

FAQ

Q1: Is this DC-DC converter a boost or a buck?

It is a boost and buck 2-in-1 (Boost and Buck) DC-DC converter that supports input voltages in the range of 8V to 40V, and it stabilizes the output of a constant 12V regardless of whether the input voltage is above or below 12V. This makes it ideally suited for use in batteries, solar systems, or in-vehicle applications where voltage fluctuations are significant.

Q2: What is the maximum output power of DC-DC boost and buck converter, 8V-40V to 12V?

These buck and boost converters usually have a high conversion efficiency (85% or more) and a maximum output current of about 3A (depending on the model and heat dissipation conditions). It is recommended to use with a heat sink or fan at high loads to avoid overheating protection triggers. Make sure the input voltage is sufficient to maintain 12V stable output.

1 review(s)

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From: Elio | Date: 8/27/2026 1:26 AM

Works flawlessly in my campervan

Installed this DC-DC converter to run a 12V fridge from my 24V leisure battery. Drop-in wiring, solid aluminium housing, and the voltage stays rock-steady under load. No heat issues after a full weekend's use. Built-in fuse is a nice touch. Proper bit of kit for the money.