LP5521中文资料具有内部程序存储器和集成电荷泵的 3 通道 RGB/白色 LED 驱动器数据手册TI规格书

描述 Description

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.

特性 Features

• Adaptive Charge Pump With 1× and 1.5× Gain Provides Up to 95% LED Drive Efficiency
• Low Input Ripple and EMI
• 200-nA Typical Shutdown Current
• I2C-Compatible Interface
• Typical LED Output Saturation Voltage 50 mV and Current Matching 1%
• Autonomous Operation Without External Control
• Two General Purpose Digital Outputs