LP5523 Datasheet, PDF (1/47 Pages) Texas Instruments – Programmable 9-Output LED Driver

LP5523
March 1, 2012
Programmable 9-Output LED Driver
General Description
The LP5523 is a 9-channel LED driver designed to produce
lighting effects for mobile devices. A high-efficiency charge
pump enables LED driving over full Li-Ion battery voltage
range. The device is equipped with an internal program mem-
ory, which allows operation without processor control.
The LP5523 maintains excellent efficiency over a wide oper-
ating range by autonomously selecting the best charge pump
gain based on LED forward voltage requirements. LP5523 is
able to automatically enter power-save mode when LED out-
puts are not active, thus lowering idle current consumption
down to 10 µA (typ).
The LP5523 has an I²C-compatible control interface with four
pin selectable addresses. The device has a flexible General
Purpose Output (GPO), which can be used as a digital control
pin for other devices. INT pin can be used to notify processor
when a lighting sequence has ended (interrupt -function). Al-
so, the device has a trigger input interface, which allows
synchronization, for example, between multiple LP5523 de-
vices.
The device requires only four small and low-cost ceramic ca-
pacitors. The LP5523 is available in a tiny 25-bump 2.27 mm
x 2.27 mm x 0.60 mm micro SMD package (0.4 mm pitch).
Features
■ ^{Three independent program execution engines, 9}
programmable outputs with 25.5 mA full-scale current, 8-
bit current setting resolution and 12-bit PWM control
resolution
■ ^{Adaptive high-efficiency 1x/1.5x fractional charge pump -}
efficiency up to 94%
■ ^{LED drive efficiency up to 93%}
■ ^{Charge pump with soft start and over-current/short-circuit}
protection
■ ^{Built-in LED test}
■ ^{200 nA typical standby current}
■ ^{Automatic power save mode; I}_VDD ^{= 10 µA (typ.)}
■ ^{Two-wire I2C-compatible control interface}
■ ^{Flexible instruction set}
■ ^{Large SRAM program memory}
■ ^{Small application circuit}
■ ^{Source (high-side) drivers}
■ ^{Architecture supports color control}
Applications
■ ^{Fun lights and indicator lights}
■ ^{LED backlighting}
■ ^{Haptic feedback}
■ ^{Programmable current source}
Typical Application
© 2012 Texas Instruments Incorporated 300436 SNVS550C
30043601
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