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
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.
Features
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85% Efficiency
User adjustable output current
Single cell operation (0.9V minimum)
Low
saturation
transistor
SOT23-3 package
Available also in Die form
Simple Application circuit
voltage
switching
Applications
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LED flashlights and torches
LED backlights
White LED driver
V
IN
L1
V
C C
LED
V
OUT
GN D
ZXLD381
© Zetex Semiconductors plc 2008
ZETEX [ ZETEX SEMICONDUCTORS ]
