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Diodes Incorporated

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Product Description:
The ZXLD381 is a single cell LED driver designed for applications where step-up voltage conversion from a very low input voltage is required. These applications mainly operate from 1.5V or 1.2V cells. The IC generates constant current pulses that are ideal for driving single or multiple LEDs over a wide range of operating voltages. The ZXLD381 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 1V. The IC can start up under full load and operates down to an input voltage of only 0.9V. The ZXLD381 is offered in the space saving SOT23 package or in die form, offering an excellent cost vs performance solution for single cell LED driving applications.

Product Specifications:
85% Efficiency
User adjustable output current
Single cell operation (0.9V minimum)
Low saturation voltage switching transistor
SOT23-3 package
Available also in Die form
Simple Application circuit

Product Overview Specs
Part Number ZXLD381
Min.- Max. Input Voltage (V) 0.9 ~ 2.2
Output Voltage (V) Vin to 20
Typ Peak Output Current (A) 0.32
Max Output Current (mA) 0.4
LED Current Accuracy (%) 10
Frequency (kHz) typ 350
Efficiency (%) 85
Operating Temperature (C) -20 to +85

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