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The ZXLD1356 is a continuous mode inductive step-down converter, designed for driving single or multiple series connected LEDs efficiently from a voltage source higher than the LED voltage. The device operates from an input supply between 6V and 60V and provides an externally adjustable output current of up to 550mA. Depending upon supply voltage and external components, this can provide up to 30 watts of output power. 
The ZXLD1356 has been qualified to AECQ100 Grade 1 enabling operation in ambient temperatures from -40°C to +125°C.
Output current can be adjusted above, or below the set value, by applying an external control signal to the 'ADJ' pin. Enhanced output current dimming can be achieved by applying a PWM signal to the ‘ADJ’ pin. 


  • Low Voltage Halogen Replacement LEDs 
  • Automotive Lighting 
  • Low Voltage Industrial Lighting 
  • LED Back-Up Lighting 
  • Illuminated Signs 
  • Emergency Lighting 
  • SELV Lighting 
  • Refrigeration Lights 


  • Typically better than 0.8% output current accuracy 
  • Simple and with low part count 
  • Single pin on/off and brightness control using DC voltage or PWM 
  • PWM resolution up to 1000:1 
  • High efficiency (up to 97%) 
  • Wide input voltage range: 6V to 60V 
  • Inherent open-circuit LED protection 
  • Available in thermally enhanced packages
    • ƒ V-DFN3030-6 θJA 44°C/W 
    • ƒ TSOT25 θJA 82°C/W 
  • Available in “Green” Molding Compound (No Br, Sb) with lead Free Finish/ RoHS Compliant
    • ƒ Totally Lead-Free & Fully RoHS Compliant
    • ƒ Halogen and Antimony Free. “Green” Device
  • ZXLD1356QET5TA Automotive Grade qualified to AEC-Q100 Grade 1 

Product Specifications

Product Parameters

Qualified to AECQ10x No
Automotive Compliant PPAP Standard
Topologies (Buck) Yes
Topologies (Buck-Boost) No
Topologies (Boost) No
Minimum Input Voltage 6 V
Maximum Input Voltage 60 V
Maximum Output Voltage 60 V
Maximum LED Current 0.55 A
LED Current Accuracy 3 %
Switching Frequency Maximum 100 kHz
Dimming (PWM) Yes
Dimming (Analog) Yes
Efficiency 97 %
Operating Temperature Range -40 to 125 °C
Sense Voltage 200 mV
AEC-Q100 Grade No

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