LP5521是TI公司的一款指示灯/RGBW产品，LP5521是可编程三通道 LED 驱动器，本页介绍了LP5521的产品说明、应用、特性等，并给出了与LP5521相关的TI元器件型号供参考。
LP5521 - 可编程三通道 LED 驱动器 - 指示灯/RGBW - LED驱动器 - TI公司（Texas Instruments，德州仪器）
- Adaptive Charge Pump with 1x and 1.5x 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
- DSBGA-20 Package, 0.4-mm Pitch
- Bumped WQFN-24 Package, 0.5-mm Pitch
- Fun / Indicator Lights
- LCD Sub-Display Backlighting
- Keypad RGB Backlighting and Phone Cosmetics
- Vibra, Speakers, Waveform Generator
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 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 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 and low cost ceramic capacitors.
Comprehensive application tools are available, including command compiler for easy LED sequence programming.
| PART NUMBER | PACKAGE | BODY SIZE (NOM) |
|---|---|---|
| LP5521TM | DSBGA (20) | 2.066 mm x 1.717 mm |
| LP5521YQ | WQFN (24) | 5.00 mm x 4.00 mm |
