Datasheet ZXLD381 (Diodes)

A Product Line of
Diodes Incorporated
ZXLD381 SINGLE OR MULTI CELL LED DRIVER SOLUTION Summary
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 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.
Features Pin Assignments
• 85% Efficiency
SOT23-3
• 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
(Top View) Application
• LED flashlights and torches

• LED backlights • White LED driver
Typical Application Circuit
VIN

L1

VCC

V LED

OUT

GND

ZXLD381

ZXLD381 1 of 9 May 2010 Document number: DS32188 Rev. 3 - 2
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