Automotive High-Voltage, HB-LED Controller

Compact and Flexible LED Driver Controller for Automotive LED Lighting Applications

Please check latest availability status for a specific part variant.


The MAX25611A/MAX25611B/MAX25611C/MAX25611D are single-channel HBLED drivers for automotive front light applications such as high beam, low beam, daytime running light (DRL), turn indicator, fog light, and other LED lights. It can take an input voltage from 5V to 36V and can drive a string of LEDs with a maximum output voltage of 65V.

The MAX25611A/B/C/D sense output current at the high side of the LED string. High-side current sensing is required to protect for shorts from the output to the ground or battery input. It is also the most flexible scheme for driving LEDs, allowing boost, high-side buck, SEPIC mode, or buck-boost mode configurations. The PWM input provides LED dimming ratios of up to 5000:1, and the REFI input provides additional analog dimming capability in the MAX25611A/B/C/D. The MAX25611A/B/C/D have built-in spread-spectrum modulation for improved electromagnetic compatibility performance. The MAX25611A/B/C/D can also be used in zeta and Cuk converter configurations if it is necessary in some applications.

The MAX25611A/B/C/D are available in a space-saving 12-pin SWTQFN-EP package. They are specified to operate over the -40°C to +125°C automotive temperature range. The switching frequency is internally set at 350kHzfor the MAX25611A/MAX25611C and 2.2MHz for theMAX25611B/MAX25611D.

Design Solution: Light the Way with a Flexible, High-Dimming Ratio Automotive LED Driver ›

MAX25611A, MAX25611B, MAX25611C, MAX25611D: Simplified Application Circuit MAX25611A, MAX25611B, MAX25611C, MAX25611D: Simplified Application Circuit Enlarge+

Key Features

  • Automotive Ready: AEC-Q100 Qualified
  • Integration Minimizes BOM for High-Brightness LED Driver
    • Integrated pMOS Dimming FET Gate Driver Allows Single-Wire Connection to LED String
    • PWM, Analog-to-PWM and Analog Dimming
    • Integrated High-Side, Current-Sense Amplifier
    • 12-Pin SWTQFN-EP Package
  • Flexible Application Configurations
    • +5V to +36V Wide Input Voltage Range with a Maximum +65V Boost Output
    • Boost, Buck-Boost, High-Side Buck, SEPIC, Zeta, and Cuk Single-Channel LED Drivers
  • Protection Features and Wide Temperature Range Increase System Reliability
    • Short-Circuit, Overvoltage, and Thermal Protection
    • -40°C to +125°C Operating Temperature Range


  • Automotive Exterior Lighting
  • Commercial, Industrial, and Architectural Lighting
  • Daytime Running Lights (DRLs)
  • Fog Lights and Adaptive Front Light Assemblies
  • Head-Up Displays
  • High Beam/Low Beam/Signal/Position lights
Part NumberRegulation TopologyMax. No. of LEDsLED ChannelsLED ConfigurationILED per Channel
PWM Dimming Freq.
Dimming RatioDimming ControlVCURR_SENSE
LED String Volt.
Oper. Freq.
maxmaxmaxminmaxmaxmaxSee Notes
MAX25611A Inductor Based151Series1.525000
Analog Controlled PWM
$1.24 @1k
$1.30 @1k
MAX25611B 362200
$1.24 @1k
$1.30 @1k
MAX25611C 48350
$1.30 @1k
MAX25611D 482200
$1.30 @1k
See All LED Drivers (78)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

MAX25611EVKIT: Evaluation Kit for the MAX25611A/MAX25611B
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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Related Resources

Integrated, 6-Channel High-Brightness LED Driver with Very Wide PWM Dimming Ratio and Phase Shifting for Automotive Displays

  • Robust with Respect to EMC and Automotive Battery Transients
  • Spread-Spectrum Mode Reduces Emission at the Switching Frequency and its Harmonics
  • Phase-Shift Dimming of LED Strings

Automotive Synchronous High Voltage LED Controller

  • Integration Minimizes BOM and Cost
  • Simple to Optimize for Efficiency, Board Space, and Input Operating Range
  • Protection Features Increase System Reliability