ZXLD381 Datasheet, PDF (1/8 Pages) Zetex Semiconductors – Single or Multi Cell LED Driver Solution

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
Features
• 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
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.
Applications
• LED flashlights and torches
• LED backlights
• White LED driver
V_IN
L1
V_{C C}
V_OUT
GN D
ZXL D381
LE D
Issue 1 - April 2008
1
© Zetex Semiconductors plc 2008
www.zetex.com