LM2794 - 具有模拟和 PWM 亮度控制的电流稳压开关电容器 LED 电源

LM2794是TI德州仪器公司的一款背光产品，LM2794是具有模拟和 PWM 亮度控制的电流稳压开关电容器 LED 电源，本站介绍了LM2794的封装应用图解、特点和优点、功能等，并给出了与LM2794相关的TI元器件型号供参考。

LM2794 - 具有模拟和 PWM 亮度控制的电流稳压开关电容器 LED 电源 - 背光 - LED驱动器 - 德州仪器

产品描述

The LM2794/95 is a fractional CMOS charge-pump that provides four regulated current sources. It accepts an input voltage range from 2.7V to 5.5V and maintains a constant current determined by an external sense resistor.

The LM2794/5 delivers up to 80mA of load current to accommodate four White LEDs. The switching frequency is 325kHz. (min.) to keep the conducted noise spectrum away from sensitive frequencies within portable RF devices.

Brightness can be controlled by both linear and PWM techniques. A voltage between 0V and 3.0V may be applied to the BRGT pin to linearly vary the LED current. Alternatively, a PWM signal can be applied to the SD pin to vary the perceived brightness of the LED. The SD pin reduces the operating current to 2.3µA (typ.) The LM2794 is shut down when the SD pin is low, and the LM2795 is shut down when the SD pin is high.

The LM2794/95 is available in a DSBGA CSP package.

产品特性

Regulated Current Sources with ±0.5% Matching between any Two Outputs
High Efficiency 3/2 Boost Function
Drives One, Two, Three or four White LEDs
2.7V to 5.5V Input Voltage
Up to 80mA Output Current
Analog Brightness Control
Active-Low or High Shutdown Input ('94/95)
Very Small Solution Size and no Inductor
2.3µA (typ.) Shutdown Current
325kHz Switching Frequency (min.)
Constant Frequency Generates Predictable Noise Spectrum
Thin DSBGA Package: 2.08mm X 2.403mm X 0.600mm High

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