LP5522 Datasheet, PDF (1/14 Pages) National Semiconductor (TI) – Programmable LED Driver

June 2007
LP5522
Programmable LED Driver
General Description
The LP5522 is a simple single wire programmable LED con-
troller in six bump micro SMD package. It provides constant
current flow through high side driver. Output current can be
set from 1 mA to 20 mA by using an external resistor on the
ISET pin. If no external resistor is used, output current is set
to 5 mA default current. The LP5522 is controlled using only
one signal. The signal controls either directly the LED driver
or it launches previously programmed blinking sequence.
The LP5522 works autonomously without a clock signal from
the master device. Very low LED driver headroom voltage
makes possible to use supply voltages close to LED forward
voltage. Current consumption of the LP5522 is minimized
when LED is turned off and once controller is disabled all
supporting functions are also shut down. Very small micro
SMD package together with minimum number of external
components is a best fit for handheld devices.
Features
■ ^{Programmable blinking sequence}
— 1 to 3 programmable pulses
— 1 ms to 255 ms LED on time
— 10 ms to 2500 ms LED off time
— Single or continuous run of programmed blinking
sequence
■ ^{Constant current high side output driver}
■ ^{Adjustable current with external resistor}
■ ^{0.2 uA typical shutdown current}
■ ^{Autonomous operation without external clock}
■ ^{Micro SMD-6 package with 0.4 mm pitch:}
1.215 mm x 0.815 mm x 0.6 mm (LxWxH)
Applications
■ ^{Indicator lights}
■ ^{Phone cosmetics}
■ ^Toys
Typical Application
20217201
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