LP5521 - 可编程三通道 LED 驱动器

LP5521是TI德州仪器公司的一款指示灯/RGBW产品，LP5521是可编程三通道 LED 驱动器，本站介绍了LP5521的封装应用图解、特点和优点、功能等，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 - 德州仪器

产品特性

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

产品应用

Fun / Indicator Lights
LCD Sub-Display Backlighting
Keypad RGB Backlighting and Phone Cosmetics
Vibra, Speakers, Waveform Generator

Typical Application Circuit

产品说明

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.

产品器件信息

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

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