LM2754 - 具有超时保护的 800mA 开关电容器闪存 LED 驱动器

LM2754是TI德州仪器公司的一款相机闪光灯LED驱动器产品，LM2754是具有超时保护的 800mA 开关电容器闪存 LED 驱动器，本站介绍了LM2754的封装应用图解、特点和优点、功能等，并给出了与LM2754相关的TI元器件型号供参考。

LM2754 - 具有超时保护的 800mA 开关电容器闪存 LED 驱动器 - 相机闪光灯LED驱动器 - LED驱动器 - 德州仪器

产品描述

The LM2754 is an integrated low noise, high current switched capacitor DC/DC converter with four regulated current sinks. The device is optimized for driving 1 to 4 high power white LEDs in parallel with a maximum current of 800mA. Maximum efficiency is achieved over the input voltage range by actively selecting the proper gain based on the LED forward voltage and current requirements.

Two external low power resistors set the desired current for Torch and Flash modes. The TX pin allows the device to be forced into Torch mode during a Flash pulse, allowing for synchronization between the RF power amplifier pulse and Flash/Torch modes. To protect the device and Flash LEDs, internal Time-Out circuitry turns off the LM2754 in case of a faulty prolonged Flash mode. Internal soft-start circuitry limits the amount of inrush current during start-up.

The LM2754 is available in a small 24-pin thermally enhanced WQFN package.

产品特性

Up to 800mA Output Current
Wide Operating Input Voltage Range: 2.8V to 5.5V
Drives 1, 2, 3 or 4 LEDs in Parallel
Ability to Disable One Current Sink Via the SEL Pin to Accommodate 3-LED Flash Modules
Time-Out Circuitry Limits Flash Duration to 1 Second
TX Input Ensures Synchronization with RF Power Amplifier Pulse
Adaptive 1x, 1.5x and 2x Gains for Maximum Efficiency
1MHz Constant Frequency Operation
Output Current Limit
True Shutdown Output Disconnect
<1µA Shutdown Current
Internal Soft-Start Limits Inrush Current
No Inductor Required
Total Solution Size without LED <28mm2
Low Profile 24-Pin WQFN Package (4mm x 4mm x 0.8mm)

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