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    DC-DC Buck Converter, 48V to 13.8V/36V

    48V to 13.8V/ 36V DC-DC power converter is a buck converter with an input voltage range of 30V to 60V, designed to step down input rated voltage 48V DC to 13.8V or 36V output voltage, conversion efficiency up to 92%. Optional different output currents for your applications.
    SKU: ATO-DCDC-48138
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    Delivery date: 6-12 days

    This series of DC-DC buck converters with synchronous rectification technology is designed to step down the input rated voltage 48V DC to 13.8V or 36V DC output voltage, and different models for your applications.


    • Wide input voltage range: 30V to 60V or 40V to 60V.
    • Brand-new, die-cast aluminum shell and high quality design, maximum transfer efficiency of 92.2%.
    • This DC step down module comes with waterproof lever of IP68, moisture-proof & anti-shock protection.
    • Auto-recovery when the device is back to normal operating.
    • Built-in full protection against over/under voltage input, over-current, overload, overhead, over-temperature and short circuit.
    • Industry grade DC 48V to 13.8V/ 36V buck converter, widely used in automotive, electricity, surveillance systems, railway signals, instruments, solar generates electricity, display screen of bus and taxi, car audio device, security systems, hospital equipment, telecommunications etc.

    5A DC-DC Buck Converter Specification

    Model ATOWG-48S13R805 ATODL-4836V05
    Input Rated voltage 48V 48V
    Voltage range 30-60V 40-60V
    Efficiency 92.2% @ 48V input 92% @ 48V input
    Output Voltage 13.8V 19V
    Max. rated current 5A 5A
    Max. rated power 69W 180W
    Voltage regulation ±1% ±1%
    Load regulation 2% 2%
    No load loss 70mA /
    Ripple & noise 120mV 80mV
    Environment Working temperature -40 ~ +80℃ -40 ~ +80℃
    Working humidity 10% ~ 90%RH /
    Storage temperature -40 ~ +100℃ /
    Function Short circuit protection YES NO
    Over current protection YES NO
    Waterproof IP68 IP67
    Over temperature protection YES NO
    Over voltage protection YES NO
    Mechanical Weight 300g 270g
    Size 64*57*22mm 74*74*32mm

    48V to 13.8V DC-DC Buck Converter Model Selection

    Code Model Price Input Voltage Output Voltage Output Current Output Power Efficiency Size Download
    1 ATOWG-48S13R805 $55.39 48V DC 13.8V DC 5 Amps 69 Watts 92.2% 64*57*22mm ATO PDF
    2 ATOWG-48S13R810 $58.79 48V DC 13.8V DC 10 Amps 138 Watts 93.7% 64*57*22mm ATO PDF
    3 ATOWG-48S13R815 $60.39 48V DC 13.8V DC 15 Amps 207 Watts 95.8% 74*74*32mm ATO PDF
    4 ATOWG-48S13R820 $61.59 48V DC 13.8V DC 20 Amps 276 Watts 95% 74*74*32mm ATO PDF
    5 ATOWG-48S13R830 $77.79 48V DC 13.8V DC 30 Amps 414 Watts 95.3% 100*80*39mm ATO PDF
    6 ATOWG-48S13R850M $136.69 48V DC 13.8V DC 50 Amps 690 Watts 97% 100*80*36mm ATO PDF
    7 ATOWG-48S13R860M $144.69 48V DC 13.8V DC 60 Amps 828 Watts 96.5% 100*80*36mm ATO PDF

    48V to 36V DC-DC Buck Converter Model Selection

    Code Model Price Input Voltage Output Voltage Output Current Output Power Efficiency Size
    1 ATODL-4836V03 $64.29 48V DC 36V DC 3 Amps 108 Watts 92% 74*74*32mm
    2 ATODL-4836V05 $69.09 48V DC 36V DC 5 Amps 180 Watts 92% 74*74*32mm
    3 ATODL-4836V08 $72.29 48V DC 36V DC 8 Amps 288 Watts 92% 74*74*32mm
    4 ATODL-4836V10 $78.59 48V DC 36V DC 10 Amps 360 Watts 92% 74*74*32mm

    Note: The series of 48V to 13.8V/ 36V DC-DC buck converter models are all here, check the parameter carefully from the table and select the right converter power supply when place the order.

    13.8 volts DC Power Supply Applications

    ATO DC-DC buck converter can step down 24V/48V DC voltage to 13.8V. 13.8V DC power supply is mainly used in vehicle charging systems, communication equipment, emergency backup power supply and other fields. Here are some specific applications:

    • Car charging system: The vehicle's charging system usually converts AC power into 13.8V DC voltage, which is used to charge the vehicle battery. This voltage value is to ensure that the battery can maintain good condition when charging and not overcharge.
    • Communications equipment: Many radio communications equipment and radio stations require 13.8V DC power to operate. These devices include amateur radio stations and professional communications equipment, and using this standard voltage ensures stable operation of the equipment.
    • Backup power supply for electronic equipment: Some electronic equipment, such as radios, communication equipment and emergency lighting, often use 13.8V DC power supply as a backup power supply. Backup power ensures equipment remains operational in the event of a primary power failure, especially during emergencies.
    • Fire alarm: Some fire alarm systems may require a 13.8V DC power supply to ensure that the system can continue to work during a power outage or other emergency, providing continuous safety monitoring.
    • Ship and aircraft equipment: Some electronic equipment and communication equipment on ships and aircraft also use 13.8V DC power supply. These equipment include navigation systems, communication equipment and various control systems. Using this voltage can ensure the reliability and stability of the equipment.

    Tips: Where are DC-DC converters used?

    DC-DC converters are widely used in various applications to efficiently convert one direct current (DC) voltage level to another. They play a crucial role in modern electronics and power management systems. Common applications include:

    • Power Supplies: DC-DC converters are integral in many electronic devices, such as laptops and smartphones, to regulate the voltage supplied to sensitive components.
    • Renewable Energy: They are used in solar power systems to convert variable DC voltages from solar panels into stable outputs for grid connection or battery charging.
    • Automotive: In electric and hybrid vehicles, DC-DC converters transform high-voltage battery power to lower voltages for vehicle subsystems.
    • Telecommunications: They help maintain stable voltage levels in cell towers, data centers, and telecom equipment, ensuring uninterrupted communication.
    • Industrial Control: DC-DC converters are used in automation, robotics, and process control systems to power sensors, controllers, and actuators.
    • Aerospace and Defense: They provide regulated power for avionics, radar, and missile systems, where reliability is critical.
    • Medical Devices: DC-DC converters ensure precise and stable power supplies for medical equipment like MRI machines and pacemakers.

    DC-DC converters offer flexibility, efficiency, and voltage regulation in diverse applications, making them indispensable in modern technology.

    Tips: What components are the main losses in a buck converter?

    The losses in buck converters are mainly concentrated in several key components, including switches, diodes, inductors and capacitors. The switch tube will produce conduction and cut-off losses when it is turned on and off, which depends on the voltage and current when the switch tube is turned on and off. Conduction losses due to the forward voltage drop of the diode are also an important factor, especially in traditional non-synchronous buck converters. Inductors will produce certain losses when converting magnetic energy into electrical energy, mainly caused by the DC resistance and AC resistance of the inductor. Capacitor loss is mainly due to the equivalent series resistance and dielectric loss of the capacitor.

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