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Diodes Pericom: A product line of Diodes Incorporated

Description

The ZXLD383 is a single or multi cell LED driver designed for applications requiring step-up voltage conversion from a very low input voltage. The IC generates constant current pulses that are ideal for driving single or multiple LEDs over a wide range of operating voltages. It includes an on/off enable input that can be driven directly from a photocell array or an open collector/drain logic output. The enable input features an ultra-low voltage drop diode to ground, eliminating the need for a photocell array isolation diode in Garden Light applications. The ZXLD383 uses a PFM control technique to drive an internal switching transistor which exhibits a low saturation resistance. This ensures high efficiency, even for input voltages as low as 1.0V. The IC can start up under full load and operates down to an input voltage of below 0.9V. The ZXLD383 is offered in the space saving TSOT25 package or in die form, offering an excellent cost vs performance solution for single cell LED driving applications.

Application

  • Garden lights
  • Door/pathway illumination
  • LED flashlight and torches
  • LED backlights
  • White LED driver
  • Gated boost supply generator

Features

  • 85% efficiency
  • User adjustable output current
  • Single cell operation
  • Low saturation voltage
  • TSOT25 package
  • Available also in die form
  • Simple application circuit

Product Specifications

Product Parameters

Topology Boost
Minimum Input Voltage 0.9 V
Maximum Input Voltage 3.3 V
Maximum Output Voltage 18 V
LED Current 0.32 A
Switching Frequency 330 kHz
Efficiency 85 %
Operating Temperature Range -20 to 85 °C
Quiescent Current Typ N/A mA

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