LP5522 Datasheet, PDF (1/17 Pages) National Semiconductor (TI) – Programmable LED Driver

LP5522
www.ti.com
SNVS488 – JUNE 2007
Programmable LED Driver
Check for Samples: LP5522
FEATURES
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•2 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
DESCRIPTION
The LP5522 is a simple single wire programmable LED controller 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.
Typical Application
V_IN
VDD
ISET
LP5522
LED
CTRL
GND
GNDT
1
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2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2007, Texas Instruments Incorporated