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User's Guide
SNVA241D–April 2008–Revised April 2013
AN-1632 LP5521TM Evaluation Kit
1 General Description
The LP5521 is a three channel LED driver designed to produce variety of lighting effects for mobile
devices. High efficiency charge pump enables LED driving over full Li-Ion battery voltage range. The
device has a program memory for creating variety of lighting sequences. When program memory has
been loaded, LP5521 can operate independently without processor control.
LP5521 maintains excellent efficiency over a wide operating range by automatically selecting proper
charge pump gain based on LED forward voltage requirements. LP5521 is able to automatically enter
power-save mode, when LED outputs are not active and thus lowering current consumption.
Three independent LED channels have accurate programmable current sources and PWM control. Each
channel has program memory for creating desired lighting sequences with PWM control.
LP5521 has a flexible digital interface. Trigger I/O and 32 kHz clock input allow synchronization between
multiple devices. Interrupt output can be used to notify processor, when LED sequence has ended.
LP5521 has four pin selectable I
2
C addresses. This allows connecting up to four parallel devices in one
I
2
C bus. GPO and INT pins can be used as a digital control pin for other devices.
LP5521 requires only four small ceramic capacitors.
LP5521 is available in tiny 2.1 × 1.7 × 0.6 mm DSBGA-20 package and in 4.0 × 5.0 × 0.8 mm bumped
QFN-24 package.
Figure 1. LP5521 Evaluation Board
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SNVA241D–April 2008–Revised April 2013 AN-1632 LP5521TM Evaluation Kit
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