Diodes Incorporated


The ZXSC400 is a voltage mode boost converter in the SOT26 package. Its low feedback voltage allows the current in a chain of LEDs to be set and accurately monitored with a single resistor giving minimal losses. Its excellent load and line regulation means that for the full supply range from lithium-ion cells, the LED current will typically change by less than 1%. Using high efficiency Zetex switching transistors with ratings of 20V and higher allow many LEDs to be chained in series for the best LED current matching possible.


  • 1.8V to 8V supply range
  • Typical output regulation of ±1%
  • Over 80% typical efficiency
  • 4.5μA typical shutdown current
  • Series connection for ultimate LED current matching


  • White LED backlighting for colour LCD panels
  • General LED backlighting
  • High performance white LED flashlights
  • General LED driving from batteries

Product Specifications

Product Parameters

AEC Qualified No
Compliance (Only Automotive supports PPAP) Standard
Topologies (Buck) No
Topologies (Buck-Boost) No
Topologies (Boost) Yes
Topologies (Charge Pump) No
Minimum Input Voltage (V) 1.8
Maximum Input Voltage (V) 8
Maximum Output Voltage (V) Ext BJT
Maximum LED Current (A) Ext BJT
Switching Frequency Maximum (kHz) 200
Dimming (PWM) Yes
Dimming (Analog) Yes
Efficiency (%) 94
Operating Temperature Range (°C) -40 to 85
Quiescent Current Typ (mA) 0.22
AEC-Q100 Grade No

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