The LM3407 device is a constant current output floating buck switching converter designed to provide constant current to high-power LEDs. The device is ideal for automotive, industrial, and general lighting applications. The LM3407 has an integrated power N-channel MOSFET that makes the application solution compact and simple to implement. An external 1% thick-film resistor allows the converter output voltage to adjust as needed to deliver constant current within 10% accuracy to a serially connected LED string of varying number and type. Converter switching frequency is adjustable from 300 kHz to 1 MHz. The LM3407 features a dimming input to enable LED brightness control by Pulse Width Modulation (PWM). Additionally, a separate enable pin allows for low-power shutdown. An exposed pad MSOP-8 package provides excellent heat dissipation and thermal performance. Input UVLO and output open-circuit protection ensure a robust LED driver solution.

• Input Operating Range 4.5 V to 30 V
• Output Voltage Range: 0.1 VIN to 0.9 VIN
• Accurate Constant Current Output
• Independent Device Enable (CMOS Compatible) and PWM Dimming Control
• Converter Switching Frequency Adjustable From 300 kHz to 1 MHz
• No External Control Loop Compensation Required
• Supports Ceramic and Low ESR Output Capacitors
• Input Undervoltage Lockout (UVLO)
• Thermal Shutdown Protection
• MSOP-8 PowerPAD Package

• Input voltage (type)
• DC/DC
• Topology
• Buck
• Vin (Min) (V)
• 4.5
• Vin (Max) (V)
• 30
• Iout (Max) (A)
• 0.35
• Iq (Typ) (mA)
• 0.78
• Features
• Adjustable Switch Frequency, Enable/Shutdown, Integrated Switch, Thermal Shutdown
• Operating temperature range (C)
• -40 to 125
• Dimming method
• PWM

LM3407的完整型号有：LM3407MY/NOPB、LM3407MYX/NOPB，以下是这些产品的关键参数及官网采购报价：

LM3407MY/NOPB，工作温度：-40 to 125，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LM3407MY/NOPB的批量USD价格：.408（1000+）

LM3407MYX/NOPB，工作温度：-40 to 125，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LM3407MYX/NOPB的批量USD价格：.34（1000+）

LM3407EVAL 350mA，恒流输出浮动降压开关稳压器评估板

The LM3407 evaluation board contains a Pulse-Width-Modulation (PWM) floating buck converter with an integrated N-Channel power MOSFET and is designed to provide a constant current output for driving high power LEDs, such as the Lumileds Luxeon® power LEDs and OSRAM Golden DRAGON® LED.

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