48 V batteries tend to be created using Li-ion multi-cell battery packs suing 8-16 cells. From a safety perspective, but also to ensure the best efficiency and longest battery life these battery packs need to be carefully monitored and controlled. This requires accurate voltage, temperature and current as well as battery state of charge (SoC) and state of health (SoH) monitoring. In addition for most efficient battery use, good cell balancing and battery optimization is a must.
Design considerations
●Depending on the current being drawn some systems can use internal cell balancing topologies, but where there is a higher current then external MOSFETs are recommended.
●Engineers also have a choice between passive and active cell balancing, although active cell balancing is often more complex give, its need for charge storage elements
●Zener diodes utilized in the cell balancing stage protect the FETs and battery cell
Products and reference designs of 48 V Battery Management System
Products - Cell balancing
Charge balancing MOSFETs: 40 V, RDSon < 5 mOhm
Automotive MOSFETs
Performance, reliability and proven AEC-Q101 quality
An in-depth understanding of automotive system requirements and focused technical capability enables Nexperia to provide power MOSFETs for a wide spectrum of applications. Choose from over 400 product types, ranging from 20 to 100 V, with drain currents from 0.3 to 425 A, housed in market-leading robust package technologies including wettable flanks for Automatic Optical Inspection (AOI) and our proven copper-clip LFPAK and CCPAK variants. From driving a simple lamp to the sophisticated needs of automotive electrification and hybrid battery systems, Nexperia provides the answer to many automotive system power challenges.
Battery protection MOSFETs: 40-100 V; < 5 mOhm
N-channel 40 V, 1.3 mΩ logic level MOSFET in LFPAK56
Automotive qualified N-channel MOSFET using the latest Trench 9 low ohmic superjunction technology, housed in a robust LFPAK56 package. This product has been fully designed and qualified to meet AEC-Q101 requirements delivering high performance and endurance.
Features and benefits
●Fully automotive qualified to AEC-Q101:
○175 °C rating suitable for thermally demanding environments
●Trench 9 Superjunction technology:
○Reduced cell pitch enables enhanced power density and efficiency with lower RDSon in same footprint
○Improved SOA and avalanche capability compared to standard TrenchMOS
○Tight VGS(th) limits enable easy paralleling of MOSFETs
●LFPAK Gull Wing leads:
○High Board Level Reliability absorbing mechanical stress during thermal cycling, unlike traditional QFN packages
○Visual (AOI) soldering inspection, no need for expensive x-ray equipment
○Easy solder wetting for good mechanical solder joint
●LFPAK copper clip technology:
○Improved reliability, with reduced Rth and RDSon
○Increases maximum current capability and improved current spreading
Applications
●12 V automotive systems
●Motors, lamps and solenoid control
●Start-Stop micro-hybrid applications
●Transmission control
●Ultra high performance power switching
ESD: TVS diodes 400-600 W
TVS 400 W / 600 W
Key features and benefits
●Industry‘s smallest packages in the 600 / 400 W surge protection class
●Small FlatPower packages SOD123W/128, only 1 mm high
●AEC-Q101 qualified
●Low reverse leakage current (down to 1 nA typical)
●Rated peak pulse power: PPPM = 600 W
●Reverse standoff voltage range: VRWM = 3.3 V to 64 V
●Very low package height: 1 mm
Key applications
●Power supply protection
●Automotive application
●Industrial application
●Power management
Products - e-fuse / regulation
efuse MOSFET: 30-60 V, P-channel
30 V, P-channel Trench MOSFET
P-channel enhancement mode MOSFET in an LFPAK56 (Power SO8) Surface-Mounted Device (SMD) plastic package using Trench MOSFET technology.
This product has been designed and qualified to AEC-Q101 standard for use in high-performance automotive applications such as reverse battery protection.
Features and benefits
●High thermal power dissipation capability
●Suitable for thermally demanding environments due to 175 °C rating
●Trench MOSFET technology
●AEC-Q101 qualified
Applications
●Reverse battery protection
●Power management
●High-side load switch
●Motor drive
Linear pre-regulation: Bipolar transistor, NPN, 100 V, 3 A
Single bipolar transistors ≤ 100 V
A great choice of devices, and packages down to ultra-small sizes
Part of our extensive small-signal bipolar device portfolio, our single bipolar transistors are perfect for your switching and amplification applications. We also offer a variety of SMD packages including our ultra small leadless housing SOT883 for space-saving designs.
Products - HMI / MMI
ESD: CAN / CAN-FD bus protection
LIN/CAN(FD)/FlexRay
Dedicated ESD protection devices to ensure safe operation
In-vehicle networks consists of multiple mircoprocessors communicating over different networks. LIN/CAN(FD)/FlexRay are highly reliable in-vehicle network protocols to handle the car's physically challenging environment. Nexperia offers dedicated ESD protection devices meeting emission, immunity and signal integrity requirements to ensure safe operation.
Autosense translators: NXB / NXS families
Voltage translators (level-shifters)
An efficient solution for voltage matching
Bi-directional level shifter and translator circuits act as an interface between applications with different supply voltage and input-output voltage levels. Our wide range of non-inverting level shifters and translators can help you find the exact solution you need.
Analog switch: LV/LVC family
Analog switches
Feature-packed solutions to bring out the best in your systems
From speaker selection in cell phones to sensor selection in industrial process monitoring, our digital switches fit countless applications. They offer low switching losses, and low THD for high quality audio switching.
Key features and benefits
●Reduced signal attenuation results in low switching losses
●Reduced total harmonic distortion for high quality audio switching
●Enable multiplexing of analog sensor signals - reduce number of ADC
●Integrated level shifting of control signals interface to lower voltage controllers
●Low ON resistance and ON resistance flatness
●Low switch leakage
●Wide supply voltage
●Low input threshold input options
●Over-voltage tolerant options
●High ESD protection per IEC61000 Standard
Key applications
●Audio/video source selection
●Analog sensor multiplexing
●GPIO expansion
●Bus Isolation
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