Diodes Incorporated

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The ZXLD1371Q 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 ZXLD1371Q 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 ZXLD1371Q 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 ZXLD1371Q 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 Input Voltage (V) 60
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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