LP3943ISQ集成电路（IC）的LED驱动器规格书PDF中文资料

LP3943ISQ属于集成电路（IC）的LED驱动器。由美国德州仪器公司制造生产的LP3943ISQLED 驱动器器件属于 LED 驱动器电源管理集成电路 (PMIC) 系列，可通过标称固定电压的电源为负载（通常为发光二极管）提供电流，并且电流可控。它与用于电压调节的类似产品的主要区别在于，这类器件提供较低的反馈电压（以提高系统能效），而且通常可对器件工作点进行外部控制，可在照明应用中用于实现调光功能。

1 Features

• Internal power-on reset

• Active low reset

• Internal precision oscillator

• Variable dim rates

(from 6.25ms to 1.6s; 160Hz to 0.625Hz)

• 16 LED drivers (multiple programmable states:

ON, OFF, input, and dimming at a specified rate)

• 16 open-drain outputs capable of driving up to

25mA per LED

2 Applications

• Customized flashing LED lights for cellular phones

• Portable applications

• Digital cameras

• Indicator lamps

• General purpose I/O expander

• Toys

3 Description

The LP3943 is an integrated device capable of

independently driving 16 LEDs. This device also

contains an internal precision oscillator that provides

all the necessary timing required for driving each

LED. Two prescaler registers, along with two PWM

registers, provide a versatile duty-cycle control.

The LP3943 contains the ability to dim LEDs in

SMBUS/I2C applications where it is required, to cut

down on bus traffic.

Traditionally, dimming LEDs using a serial shift

register such as 74LS594/5 requires a large amount

of traffic on the serial bus. The LP3943 instead

requires only the setup of the frequency and duty

cycle for each output pin; from then on, only a

single command from the host is required to turn

each individual open drain output to an ON or OFF

state, or to cycle a programmed frequency and duty

cycle. Maximum output sink current is 25mA per pin

and 200mA per package. Any ports not used for

controlling the LEDs can be used for general purpose

input/output expansion.