60W Synchronous Boost LED Driver Reference Design for Automotive Application
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Key Document


TIDA-00748 is a 60W Synchronous Boost Design for automotive LED application utilizing the Synchronous Boost Converter LM5122-Q1.  This design applies to automotive lighting for exterior lighting such as headlights and taillights and also interior LED lighting systems. The design accepts an input voltage of 8Vin to 15Vin and can drive multiple strings of 6 to 7 LEDS (16V to 24V) in series at 3A constant current. It is a low cost solution and provides undervoltage as well as overvoltage protection. This solutions offers 97% efficiency compared to inefficient nonsynchronous Boost solutions.

The TIDA-00748 can also be modified to a Boost-to-Battery configuration by connecting the cathode of the LED string (9V to 12V) to the input rather than ground and connecting the output capacitors from input to output. In this configuration, the 8V to 15V input can power strings of LEDs that require voltages lower than, higher than, or equal to the input voltage which would not work with the standard Boost configuration which requires the output voltage to be higher than the input voltage. See Figure 1 for the Boost-to-Battery configuration along with the internal block diagram of the LM5122.

  • 60W Synchronous Boost LED Driver
  • Wide Vin for automotive lighting
  • Input: 8V to 15V, Output: 16V to 24V (Boost only) or 9V to 12V (Boost-to-Battery)
  • 97% peak efficiency
  • Switching frequency: 140KHz kHz
  • Overvoltage protection, UVLO
  • AEC-Q100 grade available for LM5122-Q1
  • 4 Layer Board-Dimensions: 2100mil*5200mil
  • Free-run or synchronous switching up to 1MHz
  • Boost or Boost-to-Battery configurations allow operation for Vin>VLED , Vin=VLED, Vin<VLED
  • Cycle-by-Cycle Current Limit and optional Hiccup Mode Overload protection

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TI Devices (3)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
CSD18501Q5A  40V, N ch NexFET MOSFET™, single SON5x6, 3.2mOhm  MOSFETs  Sample & Buy View Design Kits & Evaluation Modules
INA199  26V, bi-directional current sense amplifier  Current sense amplifiers  Sample & Buy View Design Kits & Evaluation Modules
LM5122-Q1  Automotive Grade, 3-65V Wide Vin, Current Mode Synchronous Boost Controller with Multiphase Capabili  Step-up (boost)  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
CSD18501Q5A VSONP (DQJ)| 8 Download Download
INA199 Download Download
Download Download
LM5122-Q1 Download

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User guides (1)
Title Type Size (KB) Date
PDF 2139 11 Dec 2015
Design files (3)
Title Type Size (KB) Date
ZIP 263 11 Dec 2015
PDF 122 11 Dec 2015
PDF 153 11 Dec 2015

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