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Issue 3 - September 2007 1 www.zetex.com
© Zetex Semiconductors plc 2007
ZXSC380
Single or multi cell LED driver solution
Description
The ZXSC380 is a highly integrated single or
multi cell LED driver 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
ZXSC380 provides a simple to use, low cost,
space saving and easy to layout solutions.
The ZXSC380 uses a PFM control technique to
drive an internal switching transistor which
has 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 typical.
The ZXSC380 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.
SOT23
Features
• 80% efficiency
• User adjustable output current
• Single cell operation
• Low saturation voltage switching transistor
• Simple application circuit
• Low external component count
• SOT23 package
• Available also in die form
Applications
• LED flashlights and torches
• LED backlights
• White LED driver
Pin connections Typical application circuit
V
CC
GND
V
OUT
Top view
1
2
3
V
CC
V
OUT
GND
V
IN
GND
L1
LED1
ZXSC380
1
2
3