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.

• Input Voltage: 2.5 V to 5.5 V
• Programmable 4.5-V or 5-V Constant Output Voltage
• Dual High-Side Current Sources
• Grounded Cathode Allowing for Better Heat Sinking and LED Routing
• > 90% Efficiency
• Ultra-Small Solution Size: < 23 mm2
• Four Operating Modes: Torch, Flash, LED Indicator, and Voltage Output
• Accurate and Programmable LED Current from 37.5 mA to 1.2 A
• Hardware Flash and Torch Enable
• LED Thermal Sensing and Current Scaleback
• Software Selectable Input Voltage Monitor
• Programmable Flash Timeout
• Dual Synchronization Inputs for RF Power-Amplifier Pulse Events
• Open and Short LED Detection
• Active High Hardware Enable for Protection Against System Faults
• 400-kHz I2C-Compatible Interface

• Input voltage (type)
• DC/DC
• Topology
• Boost, Current Mode
• Vin (Min) (V)
• 2.7
• Vin (Max) (V)
• 5.5
• Iout (Max) (A)
• 1.2
• Iq (Typ) (mA)
• 0.63
• Features
• I2C Control
• Operating temperature range (C)
• -30 to 85
• Dimming method
• Analog, PWM

LM3554的完整型号有：LM3554TME/NOPB、LM3554TMX/NOPB，以下是这些产品的关键参数及官网采购报价：

LM3554TME/NOPB，工作温度：-30 to 85，封装：DSBGA (YFQ)-16，包装数量MPQ：250个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SNAGCU，TI官网LM3554TME/NOPB的批量USD价格：.468（1000+）

LM3554TMX/NOPB，工作温度：-30 to 85，封装：DSBGA (YFQ)-16，包装数量MPQ：3000个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SNAGCU，TI官网LM3554TMX/NOPB的批量USD价格：.39（1000+）

LM3554TMEEV — 用于 LM3544 的评估板

Synchronous Boost Converter with 1.2A Dual High Side LED Drivers and I2C-Compatible Interface

LM355XSW-LINUX — 用于 LM355X 的 Linux 驱动程序

The Linux driver supports the LM355X series of LED Drivers. The Linux driver supports communication through the I2C bus and interfaces with the LED sub-system.

Linux Mainline Status

Available in Linux Main line: Yes
Available through git.ti.com: N/A

Supported Devices:

• lm3554
• lm3556

Linux Source Files

(...)

LM3554 Graphical User Interface

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