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Analog Devices / Maxim Integrated MAX20050–MAX20053 Synchronous-Buck LED Drivers

Analog Devices MAX20050–MAX20053 Synchronous-Buck LED Drivers are high-brightness LED (HB LED) drivers designed for automotive exterior lighting applications. The devices drive a series string of LEDs up to 2A with a minimum number of external components with a fully synchronous step-down converter with integrated 0.14Ω MOSFETs.

The MAX20050–MAX20053 HB LED Drivers have a wide 4.5V to 65V input supply range that supports extreme automotive cold crank and load-dump conditions. A low- and high-switching frequency option of 400kHz or 2.1MHz allows the designer to optimize for solution size or efficiency while avoiding interference within the AM band. Spread spectrum provides further options for the designer to reduce EMI at the system level. The Analog Devices MAX20050/MAX20051 have an internal switching frequency of 400kHz, while the MAX20052/MAX20053 has an internal switching frequency of 2.1MHz.

Features

  • Fully synchronous 2A step-down converter with integrated 0.14Ω (typ.) MOSFETs
  • Wide 4.5V to 65V input supply range
  • Two switching frequency options (400kHz and 2.1MHz)
  • Internal loop compensation (MAX20050/MAX20052) and external loop compensation (MAX20051/MAX20053) options
  • Switching frequency synchronized to PWM dimming signal
  • Active-Low Fault (FLT) indicator
  • Output short-circuit protection
  • High-side current regulation eliminates one connection to the LED string
  • Spread-spectrum mode alleviates EMI problems
  • Low 200mV full-scale high-side current-sense voltage
  • REFI pin adjusts LED current down to zero
  • PWM dimming disconnects both high- and low-side MOSFET drivers
  • 5V, 10mA LDO output provides bias to other circuits
  • Ultra-low shutdown current (5μA typ.)
  • Output overload, short-circuit, and overtemperature protections
  • 12-pin (3mm x 3mm) TDFN and 14-pin (5mm x 4.4mm) TSSOP package options

Applications

  • Daytime Running Lamps (DRLs)
  • Fog lamps
  • Clearance Lamps (CLLs)
  • Corner Lamps (CLs)
  • Rear lamps
  • Headlamps
  • Commercial, industrial, and architectural lighting

Additional Resources

Publicado: 2018-08-24 | Actualizado: 2023-04-25