The LM3405A is a 1-A constant current buck LED driver designed to provide a simple, high efficiency solution for driving high power LEDs. With a 0.205-V reference voltage feedback control to minimize power dissipation, an external resistor sets the current as needed for driving various types of LEDs. Switching frequency is internally set to 1.6 MHz, allowing small surface mount inductors and capacitors to be used. The LM3405A uses current-mode control and internal compensation offering ease of use and predictable, high performance regulation over a wide range of operating conditions. With a maximum input voltage of 22 V, the device can drive up to 5 High-Brightness LEDs in series at 1-A forward current, with the single LED forward voltage of approximately 3.7 V. Additional features include user accessible EN/DIM pin for enabling and PWM dimming of LEDs, thermal shutdown, cycle-by-cycle current limit and overcurrent protection.

• VIN Operating Range of 3 V to 22 V
• Drives up to 5 High-Brightness LEDs in Series at 1 A
• Thin SOT-6 and MSOP-PowerPAD?-8 Packages
• 1.6-MHz Switching Frequency
• EN/DIM Input for Enabling and PWM Dimming of LEDs
• 300-mΩ NMOS Switch
• 40-nA Shutdown Current at VIN = 5 V
• Internally Compensated Current-mode Control
• Cycle-by-Cycle Current Limit
• Input Voltage UVLO
• Overcurrent Protection
• Thermal Shutdown

• Input voltage (type)
• DC/DC
• Topology
• Buck
• Vin (Min) (V)
• 3
• Vin (Max) (V)
• 22
• Iout (Max) (A)
• 1
• Iq (Typ) (mA)
• 1.8
• Features
• Enable/Shutdown, Integrated Switch, Thermal Shutdown
• Operating temperature range (C)
• -40 to 125
• Dimming method
• PWM

LM3405A的完整型号有：LM3405AXMK/NOPB、LM3405AXMKE/NOPB、LM3405AXMKX/NOPB、LM3405AXMY/NOPB、LM3405AXMYX/NOPB，以下是这些产品的关键参数及官网采购报价：

LM3405AXMK/NOPB，工作温度：-40 to 125，封装：SOT-23-THIN (DDC)-6，包装数量MPQ：1000个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SN，TI官网LM3405AXMK/NOPB的批量USD价格：.24（1000+）

LM3405AXMKE/NOPB，工作温度：-40 to 125，封装：SOT-23-THIN (DDC)-6，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：SN，TI官网LM3405AXMKE/NOPB的批量USD价格：.24（1000+）

LM3405AXMKX/NOPB，工作温度：-40 to 125，封装：SOT-23-THIN (DDC)-6，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：SN，TI官网LM3405AXMKX/NOPB的批量USD价格：.2（1000+）

LM3405AXMY/NOPB，工作温度：PropertyValue，封装：HVSSOP (DGN)-8，包装数量MPQ：1000个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SN，TI官网LM3405AXMY/NOPB的批量USD价格：.24（1000+）

LM3405AXMYX/NOPB，工作温度：PropertyValue，封装：HVSSOP (DGN)-8，包装数量MPQ：3500个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SN，TI官网LM3405AXMYX/NOPB的批量USD价格：.2（1000+）

LM3405AEVAL — 具有内部补偿的 1.6MHz、1A 恒流降压 LED 驱动器评估模块 （采用小型 SOT-23 封装）

The LM3405A demo board is configured to drive a series string of high power, high brightness LEDs at a forward current of 1A using the LM3405A constant current buck regulator. The board can accept a full input operating range of 3V to 22V. The converter output voltage adjusts as needed to maintain (...)

LM3405AXMYEVAL — LM3405AXMY - 具有 eMSOP 封装的 1.6 MHz、1A 恒流降压 LED 驱动器 EVM

LM3405A is a 1A constant current buck LED driver designed to provide a simple high efficiency solution for driving high power LEDs. With a 0.205V reference voltage feedback control to minimize power dissipation, an external resistor sets the current as needed for driving various types of LEDs. (...)

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