Synchronous High Voltage 4 Switch Buck Boost LED Controller

Automotive Seamless High-Voltage Buck-Boost LED Driver with more than 95% Efficiency

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The MAX25600 is a synchronous 4-switch buck-boost LED driver controller. The controller regulates the LED current for LED string voltages from 0V to 60V. The MAX25600 can be used as a seamless buck-boost LED driver for applications that require an efficient buck-boost LED driver with synchronous rectification. The MAX25600 is ideal for high-power applications that require a current source with PWM dimming capability.

The device provides seamless transition between buck, boost, and buck-boost modes depending on the ratio of input to output voltage. The MAX25600 is ideal for LED driver applications in automotive, industrial, and other LED lighting applications. A fault flag indicates open LED, shorted LED, or thermal shutdown conditions. The device uses Maxim's proprietary average-current-mode control scheme and allows adjustable 200kHz to 700kHz fixed-frequency operation. In addition, ±6% triangular spread spectrum is added internally to the oscillator to improve EMI performance. The MAX25600 provides both analog and digital PWM dimming, and has built-in analog PWM dimming at a dimming frequency of 200Hz. The adjustable soft-start feature limits the current peaks and voltage overshoots at startup. The MAX25600 integrates a high-side p-channel dimming MOSFET driver for PWM dimming applications that require fast rising and falling edges of the LED current. It also features robust output open and short protection, is AEC qualified, and is suitable for automotive applications.

Design Solution: Improve Automotive Exterior LED Lighting with Buck-Boost Average Current Control ›

MAX25600: Simplified Application Circuit MAX25600: Simplified Application Circuit Enlarge+

Key Features

  • Automotive Ready: AEC-Q100 Qualified
  • Integration Minimizes BOM for High-Brightness LED Driver, Saving Space and Reducing Cost
    • Wide Input-Voltage Range from 5V to 60V
    • H-Bridge Single Inductor Buck-Boost Architecture
    • Constant-Current and Constant-Voltage Regulation
    • 28-pin TSSOP with EP Pad and 28-pin(5mm x 5mm) TQFN with EP Pad Packages
  • Wide Dimming Ratio allows High Contrast Ratio
    • Analog and PWM Dimming
    • Flicker-Free PWM Dimming with Spread Spectrum
    • Integrated pMOS Dimming FET Gate Driver
    • 200Hz On-Board Ramp Simplifies PWM Dimming
  • Protection Features and Wide Temperature Range Increase System Reliability
    • Short Circuit,Overvoltage, and Thermal Protection
    • LED Current Monitor and Input Current Limiter
    • -40°C to +125°C Operating Junction-Temperature Range


  • Automotive Exterior Lighting and General, Commercial, and Industrial Lighting

See parametric specs for LED Drivers (83)

Part NumberRegulation TopologyMax. No. of LEDsLED ChannelsVIN
MAX25600 Inductor Based151560

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.

MAX25600EVKIT: Evaluation Kit for the MAX25600
Request Reliability Report for: MAX25600 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

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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