The LM3405 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 required 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 LM3405 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 15 V, the device can drive up to 3 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 15 V
• Drives up to 5 High-Brightness LEDs in Series at 1 A
• Thin SOT-6 Package
• 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)
• 15
• 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

LM3405的完整型号有：LM3405XMK/NOPB、LM3405XMKX/NOPB，以下是这些产品的关键参数及官网采购报价：

LM3405XMK/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LM3405XMK/NOPB的批量USD价格：.386（1000+）

LM3405XMKX/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LM3405XMKX/NOPB的批量USD价格：.322（1000+）

LM3405XEVAL — 为 LED 供电的 1.6MHz 1A 恒流降压稳压器

The LM3405 demo board is configured to drive a series string of high power, high brightness LEDs at a forward current of 1A using the LM3405 constant current buck regulator. The board can accept a full input operating range of 3V to 15V. The converter output voltage adjusts as needed to maintain a (...)

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