LM3554中文资料具有 1.2A 双路高侧 LED 驱动器和 I2C 兼容接口的同步升压转换器数据手册TI规格书

描述 Description

The LM3554 is a 2-MHz fixed-frequency, current-mode synchronous boost converter. The device is designed to operate as a dual 600-mA (1.2 A total) constant-current driver for high-current white LEDs, or as a regulated 4.5-V or 5-V voltage source.
The main features include: an I2C-compatible interface for controlling the LED current or the desired output voltage, a hardware flash enable input for direct triggering of the flash pulse, and dual TX inputs which force the flash pulse into a low-current torch mode allowing for synchronization to RF power amplifier events or other high-current conditions. Additionally, an active high hardware enable (HWEN) input provides a hardware shutdown during system software failures.
Five protection features are available within the LM3554 including a software selectable input voltage monitor, an internal comparator for interfacing with an external temperature sensor, four selectable current limits to ensure the battery current is kept below a predetermined peak level, an overvoltage protection feature to limit the output voltage during LED open circuits, and an output short circuit protection which limits the output current during shorts to GND.
For all available packages, see the orderable addendum at the end of the data sheet.

特性 Features

• Input Voltage: 2.5 V to 5.5 V
• Dual High-Side Current Sources
• > 90% Efficiency
• Four Operating Modes: Torch, Flash, LED Indicator, and Voltage Output
• Hardware Flash and Torch Enable
• Software Selectable Input Voltage Monitor
• Dual Synchronization Inputs for RF Power-Amplifier Pulse Events
• Active High Hardware Enable for Protection Against System Faults
• 400-kHz I2C-Compatible Interface