Focus MOSFET application – Automotive Lighting

Robust MOSFETs in compact footprint

Application Considerations

Headlights deliver a variety of functions for the driver including high beam, low beam, fog lights, daylight running indicators and parking lights. Similarly rear clusters provide illumination for braking, reversing, fog lights, or indicators.

Light Emitting Diodes (LED) are becoming more widespread in modern vehicles to deliver exterior and interior illumination.

The key advantages of LEDs over convention halogen bulbs are their high luminance/Watt, small size and reliability which has opened up design possibilities for engineers.

Key features and benefits

Headlight and rear light clusters can be illuminated by strings of LEDs controlled by a dedicated driver configured in a boost or boost/buck DCDC converter topology. The power dissipation of individual LED strings can reach >40W in a confined space, so MOSFETs with good switching performance combined with low on-state losses are required. Due to the space constraints and often limited heat sinking, products with low thermal impedance are also desirable. The longer the string of series connected LEDs the greater the VDS of the MOSFET required to control them.

Interior lights and backlit LCD where the power requirements are lower can be addressed by our large portfolio of LFPAK56 and LFPAK56D devices.



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LFPAK56 (Single & Dual Power-SO8) MOSFETs are ideally suited to provide compact and thermally stable solutions for automotive lighting applications.

Main benefits:

  • Robust product using advanced copper clip technology
  • Low on-state losses
  • Low switching losses
  • Compact footprint

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Focus MOSFET application – Automotive Lighting
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Products

Type number Description Status Quick access
BUK9K25-40E Dual N-channel 40 V, 29 mΩ logic level MOSFET Production
BUK9K29-100E Dual N-channel TrenchMOS logic level FET Production
BUK9K45-100E Dual N-channel TrenchMOS logic level FET Production
BUK9M23-80E N-channel 80 V, 23 mΩ logic level MOSFET in LFPAK33 Production
BUK9M35-80E N-channel 80 V, 35 mΩ logic level MOSFET in LFPAK33 Production
BUK9Y25-80E N-channel 80 V, 27 mΩ logic level MOSFET in LFPAK56 Production
BUK9Y29-40E N-channel 40 V, 29 mΩ logic level MOSFET in LFPAK56 Production
BUK9Y38-100E N-channel 100 V, 38 mΩ logic level MOSFET in LFPAK56 Production
BUK9Y41-80E N-channel 80 V, 45 mΩ logic level MOSFET in LFPAK56 Production
BUK9Y59-60E N-channel 60 V, 59 mΩ logic level MOSFET in LFPAK56 Production

Documentation

File name Title Type Date
2010-0518_CAR_7_headlight_v2 Headlight Marcom graphics 2015-03-17

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