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    Picture of DC-DC Boost-Buck Converter, 8V-40V to 13.8V
    Picture of DC-DC Boost-Buck Converter, 8V-40V to 13.8V
    Picture of DC-DC Boost-Buck Converter, 8V-40V to 13.8V
    Picture of DC-DC Boost-Buck Converter, 8V-40V to 13.8V

    DC-DC Boost-Buck Converter, 8V-40V to 13.8V

    1 review(s) | Add your review
    SKU: PH-DCBBC-8-40S13R8
    $57.35
    ● DC-DC buck and boost converter with a wide input voltage range of 8-40V is an efficient and stable bi-directional voltage regulator module. ● The output of high current buck boost converter is stabilized at 13.8V, and the output current supports 3A/5A/10A/20A. ● Conversion efficiency of more than 90%, even at low voltage can provide stable power. ● Power supply noise as low as 250mVp-p and cost-effective design with built-in 20A fuse and short-circuit protection are available from stock.
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    Overview

    High efficiency buck and boost converter (8-40V to 13.8V) in stock for sale! Continuous input voltage up to 40V, output accuracy ±2%, output current 3A/5A/10A/20A optional, support for over-current, short-circuit and over-temperature protection (80°C automatic recovery), safe and reliable.

    DC DC boost buck converter 8v-40v to 13.8v features

    Feature

    • Up to 90%+ conversion power, input voltage 8-40V, output stabilized at 13.8V.
    • Current optional 3A/5A/10A/20A, with automatic recovery undervoltage protection.
    • Best buck boost converter adopts natural cooling, up to 200,000 hours of trouble-free operation.
    • With comprehensive protection functions such as short circuit, over temperature (shell 80℃ automatic recovery), no external capacitor, extremely easy to use.
     

    Details

    1. The die-cast aluminum alloy shell has better thermal conductivity/heat dissipation effect and strengthens the hardness of the dc converter body itself.
    2. DC-DC step up down converter organic silicone potting with IP68 protection level, waterproof, dustproof and shockproof, can be applied to a variety of harsh environments.
    3. The inductance directly affects the stability of the power supply. This 13.8V buck boost converter's pure copper inductor with magnetic core can effectively play the role of filtering, oscillation, trapping and so on.
    4. Adopting various precision components and synchronous voltage regulator technology, the power supply has extremely low heat generation, sufficient power, stable output and higher conversion efficiency.
    DC DC boost buck converter 8v-40v details

    Dimension (unit: mm)

    8V-40V to 13.8V 3A

    DC DC boost buck converter 8v-40v, 13.8V 3A dimension

    8V-40V to 13.8V 5A/10A/20A

    DC DC boost buck converter 8v-40v, 13.8V 6A dimension

    Wiring Diagram

    DC DC boost buck converter 5v-36v wiring

    Specs
    Input
    Input Voltage 8-40V
    Max. Input Voltage 40V (Continuous)
    Undervoltage Shutdown 7.5-7.8V (Automatic Recovery)
    Undervoltage Recovery 8.5-8.7V (Automatic Recovery)
    Max. Input Current 6.1A (Vin=7.8V; Iout =3A)
    No Load Current 30mA (Typ. 15mA; Vin=24V)
    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 /
    Fuse 20A (Input positive has built-in fuse)
    Output
    Efficiency 89.6% (Vin=24V; Iout=3A)
    Output Voltage 13.5-13.9V (Vin=24V; Iout=3A)
    Regulator Accuracy ±2%
    Voltage Regulation
    Load Regulation
    Overvoltage Protection /
    Output Current 0-3A
    Overcurrent Protection 7.5A (Vin=24V)
    External Capacitance Don't need
    Output Ripple and Noise 250mVp-p (Vin=8-40V; Iout=3A, Oscilloscope Bandwidth: 20 MHz)
    Output Voltage Rise Time 30mS
    Boot Delay Time 30mS
    Out Voltage Overshoot 2% (Vin=24V, 50%-75% Load Step)
    Over Temperature Protection Shell temperature, @ 80°C Restore working
    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 100±10kHz

    Note: This table takes the specification of 8-40V to 13.8V, 3A as an example, please see the selection table below for 5A/10A/20A specification files.


    DC-DC Boost-Buck Converter Model Selection

    Output Current/Power: 3A/41.4W, Efficiency: 89.6%, Size: 64*57*22mm PDF computing8V-40V to 13.8V, 3A DC-DC Boost-Buck Converter User Manual
    Output Current/Power: 5A/69W, Efficiency: 93.5%, Size: 74*74*32mm PDF computing8V-40V to 13.8V, 5A DC-DC Boost-Buck Converter User Manual
    Output Current/Power: 10A/138W, Efficiency: 93.5%, Size: 74*74*32mm PDF computing8V-40V to 13.8V, 10A DC-DC Boost-Buck Converter User Manual
    Output Current/Power: 20A/276W, Efficiency: 96.2%, Size: 74*74*32mm PDF computing8V-40V to 13.8V, 20A DC-DC Boost-Buck Converter User Manual
    Application
    Industrial equipment

    Industrial Equipment

    Automotive equipment

    Automotive Equipment

    Vehicle LED advertising

    Vehicle LED Advertising

    Communication equipment

    Communication Equipment

    FAQ

    Q1: What equipment is the 8V-40V to 13.8V DC-DC converter suitable for powering?

    The 13.8V output voltage is widely used in automotive communication equipment (such as walkie-talkies), LED light bars, industrial control boards, battery maintenance charging and other applications. This DC-DC step up down converter is ideal for use as a voltage regulator in mixed high and low voltage power supply systems, especially where a stable power supply is required for a long period of time.

    Q2: Does this DC-DC boost-buck converter support scenarios with input voltages above and below the output voltage?

    Yes, the boost buck converter supports a wide range of inputs (8V-40V) and can stabilize the output voltage to 13.8V, which is normal regardless of whether the input voltage is above, equal to, or below 13.8V. This is the core advantage of the “Boost-Buck” structure, which is particularly suitable for voltage regulation applications in automotive, solar systems and unstable power supply scenarios.

    1 review(s)
    5.0 1
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    Ansel | 9/16/2026 2:41 AM
    Solid DC-DC Boost Buck Converter for 13.8V Output
    Hooked up this DC-DC boost-buck converter in my truck to power sensitive 12V gear. It handles the 8V-40V wide input range effortlessly and holds a rock-solid 13.8V output. The aluminum housing keeps it cool, and IP68 waterproofing gives total peace of mind for outdoor setups. Easy installation and zero noise issues. Highly recommend!
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