The LP5521 is a three-channel LED driver designed to produce variety of lighting effects
for mobile devices. A 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 autonomously without processor control allowing
power savings.
The device maintains excellent efficiency over a wide operating range by automatically
selecting proper charge pump gain based on LED forward voltage requirements and 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.
The LP5521 has a flexible digital interface. Trigger I/O and a 32-kHz clock input allow
synchronization between multiple devices. Interrupt output can be used to notify processor, when
LED sequence has ended. The LP5521 has four pin selectable
I2C-compatible addresses. This allows connecting up to four parallel
devices in one I2C-compatible bus. GPO and INT pins can be used as a
digital control pin for other devices.
The LP5521 requires only four small, low-cost ceramic capacitors.
Comprehensive application tools are available, including command compiler for easy LED
sequence programming.
For all available packages, see the orderable addendum at the
end of the data sheet.
