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The ZXLD1371 is an LED driver controller IC for driving external MOSFETs to drive high current LEDs. It is a multi-topology controller enabling it to efficiently control the current through series connected LEDs. The multi-topology enables it to operate in buck, boost and buck-boost configurations with only one current sense resistor. The ZXLD1371 is similar to the ZXLD1370 with a lower minimum operating voltage of 5.0V, which allows it work from power rails that might be subjected to transients. Its 60V capability coupled with its multi-topology capability enables it to be used in a wide range of applications and drive in excess of 15 LEDs in series. The ZXLD1371 is a modified hysteretic controller using a patent pending control scheme providing high output current accuracy in all three modes of operation. High accuracy dimming is achieved through DC control and high frequency PWM control. The ZXLD1371 uses two pins for fault diagnosis. A flag output highlights a fault, while the multi-level status pin gives further information on the exact fault.


  • Operates down to 5.0V
  • High accuracy LED control: 1% reference tolerance
  • Multi-topology device
  • LED thermal management via external thermistor
  • Separate 1000:1 PWM dimming capability
  • Switching frequency up to 1MHz


  • Automotive daylight running lights
  • Commercial/industrial illumination
  • Street lights

Product Specifications

Product Parameters

AEC Qualified Yes
Compliance (Only Automotive supports PPAP) Automotive
Topologies (Buck) Yes
Topologies (Buck-Boost) Yes
Topologies (Boost) Yes
Topologies (Charge Pump) No
Minimum Input Voltage (V) 5
Maximum Output Voltage (V) Ext MOSFET
Maximum LED Current (A) Ext MOSFET
LED Current Accuracy (%) 2
Switching Frequency Maximum (kHz) 1000
Dimming (PWM) Yes
Dimming (Analog) Yes
Efficiency (%) 95
Operating Temperature Range (°C) -40 to 125
Sense Voltage (mV) 218
AEC-Q100 Grade 1

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Orderable Part Number Buy from Distributor / Contact Sales Request Samples


Authorized Distributor Quantity Inventory Date Countries/Regions Buy Online
Arrow Electronics 50 8/11/2022 United States Buy Now
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Authorized Distributor Quantity Inventory Date Countries/Regions Buy Online
Digi-Key Electronics 1 8/11/2022 Europe, Asia, North America Buy Now
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Product Change Notices (PCNs)

A PCN may only apply to specific orderable part numbers in this datasheet. Please refer to the corresponding PCN to see the exact orderable part number(s) affected.

PCN # Issue Date Implementation Date Subject
PCN-2248 2017-02-09 2017-05-09 Lead Frame Supplier Change and Datasheet Change for High Level Gate Driver Output Voltage Minimum and Typical Values on Select Analog Automotive Parts