HV - LV DC-DC Converter

HV - LV Power Transfer in EVs

Discover power electronics enabling high to low voltage DC-DC conversion in electric vehicles. Solution guide with product value propositions and EV electronics examples, focusing on 48 V powernet.

Solution Guide

Overview

HV - LV DC-DC converters are essential for modern electric and hybrid vehicles, enabling efficient power transfer between high voltage (HV, 400 V or 800 V battery architecture) and low voltage (LV) power nets. These converters support a wide range of applications in HEV, PHEV and BEV electric vehicles, providing reliable energy management for both propulsion and auxiliary systems.

onsemi's solution platform offers scalable, modular architectures for both unidirectional and bidirectional power flow, allowing designers to optimize energy distribution and system flexibility. Typical converter power levels range from 1 kW to 5 kW, with components rated for 40 V - 100 V on the LV side and up to 1200 V for HV operation. The interactive block diagram guides engineers through system integration, highlighting best practices for power electronics and topology selection, ensuring safety compliance and redundancy.

With advanced silicon carbide EliteSiC MOSFETs, Super-Junction (SJ) MOSFETs, and Automotive Power Modules (APM16 and APM32), our solutions deliver peak efficiency and reliability for both 400 V systems and 800 V platforms. Design your vehicle's electrical architecture with robust DC-DC conversion, seamless integration, and future-ready performance for every challenge.

Block Diagrams

DC-DC Converter HV-48V/12V

Products

Silicon Carbide (SiC) MOSFETs

Our SiC MOSFETs are designed to be fast and rugged and include system benefits from high efficiency to reduced system size and cost. MOSFETs are metal–oxide–semiconductor field-effect transistors with insulated gates. These silicon carbide MOSFETs have a higher blocking voltage and higher thermal conductivity than silicon MOSFETs, despite having similar design elements. SiC power devices also have a lower state resistance and 10 times the breakdown strength of regular silicon. In general, Systems with SiC MOSFETs have better performance and increased efficiency when compared to MOSFETs made with silicon material.

There are many advantages to choosing SiC MOSFETs over silicon MOSFETs, such as higher switching frequencies. High-temperature development is also not a concern when using SiC MOSFET modules because these devices can operate efficiently even in high heat. Additionally, with SiC MOSFETs, you benefit from a more compact product size because all components (inductors, filters, etc.) are smaller.

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IGBTs

Insulated Gate Bipolar Transistors (IGBTs) that offer maximum reliability in high performance power conversion applications.

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Gate Drivers

GaN, IGBT, FET, MOSFET, H-Bridge MOSFET, and SiC MOSFET inverting and non-inverting drivers ideal for switching applications.

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Wired Transceivers & Modems

Modems and transceivers for a variety of data transmission protocols, including FlexRay^TM, KNX, M-BUS, LIN, CAN, MAU, HART and Power Line Carrier (PLC).

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Low/Medium Voltage MOSFETs

Portfolio of comprehensive range of Low-medium voltage power Mosfets that delivers superior performance and reliability for switching applications. Our cutting-edge PowerTrench^® T10 technology delivers industry leading RDS, higher power density, reduced switching losses and better thermal performance.

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High Voltage MOSFETs

Portfolio of high voltage super-junction (SJ) MOSFETs meant for general usage and for several applications such as Power Factor correction, server/telecom power, led lighting.

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Linear Regulators (LDO)

A portfolio that provides optimum solution for low power, space conscious and low noise designs.

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Current Sense Amplifiers

Current sensing requires accurate measurements and onsemi’s current sense amplifiers offer high degree of precision current sensing along with the advantages of wide input common mode range, bidirectional current sensing and high/low side current sensing.

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