DESCRIPTION

· The LP5521 is a three-channel LED driver designed for mobile devices, enabling a variety of lighting effects.
· It features a high-efficiency charge pump for driving LEDs across the full Li-Ion battery voltage range.
· Equipped with program memory, it can operate autonomously, saving power by not requiring processor control.
· The device automatically selects the appropriate charge pump gain based on LED forward voltage requirements and enters power-save mode when LED outputs are inactive.
· It includes three independent LED channels with precise programmable current sources and PWM control, each capable of creating desired lighting sequences.
· The LP5521 supports a flexible digital interface, trigger I/O, and a 32-kHz clock input for synchronization between multiple devices.
· It features an interrupt output to notify the processor when an LED sequence ends and allows up to four devices on a single I2C-compatible bus with four pin-selectable addresses.
· The device requires only four small, low-cost ceramic capacitors and is supported by comprehensive application tools.

FEATURES

· Adaptive charge pump with 1× and 1.5× gain, achieving up to 95% LED drive efficiency.
· Includes soft start and protection features against overcurrent and short-circuit.
· Low input ripple and EMI, with a very small solution size that requires no inductor or resistors.
· Typical shutdown current of 200-nA and automatic power save mode.
· I2C-Compatible Interface for easy integration.
· Independently programmable constant current outputs with 8-bit current setting and 8-bit PWM control.
· Typical LED output saturation voltage of 50mV and current matching of 1%.
· Three program execution engines with a flexible instruction set for complex lighting sequences.
· Large SRAM program memory for extensive lighting patterns.
· Two general-purpose digital outputs for additional control capabilities.

APPLICATIONS

· Fun and indicator lights in various consumer electronics.
· LCD sub-display backlighting and keypad RGB backlighting in mobile phones.
· Phone cosmetics and vibra, speakers, waveform generator applications.
· Blood glucose meters and handheld POS terminals.
· Electronic access control systems.
· Any application requiring RGB indication for user interface or aesthetic purposes.