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.
● Adaptive Charge Pump With 1× and 1.5× Gain Provides Up to 95% LED Drive Efficiency
● Charge Pump with Soft Start and Overcurrent, Short-Circuit Protection
● Low Input Ripple and EMI
● Very Small Solution Size, No Inductor or Resistors Required
● 200-nA Typical Shutdown Current
● Automatic Power Save Mode
● I2C-Compatible Interface
● Independently Programmable Constant Current Outputs with 8-Bit Current Setting and 8-Bit PWM Control
● Typical LED Output Saturation Voltage 50 mV and Current Matching 1%
● Three Program Execution Engines with Flexible Instruction Set
● Autonomous Operation Without External Control
● Large SRAM Program Memory
● Two General Purpose Digital Outputs
