The LM3406 family are monolithic switching regulators designed to deliver constant currents to high power LEDs. Ideal for automotive, industrial, and general lighting applications, they contain a high-side N-channel MOSFET switch with a current limit of 2.0A (typical) for step-down (Buck) regulators. Controlled on-time with true average current and an external current sense resistor allow the converter output voltage to adjust as needed to deliver a constant current to series and series-parallel connected LED arrays of varying number and type. LED dimming via pulse width modulation (PWM) is achieved using a dedicated logic pin or by PWM of the power input voltage. The product feature set is rounded out with low-power shutdown and thermal shutdown protection.

• LM3406HV-Q1
  • Automotive Grade Device
  • AEC-Q100 Grade 1 Qualified
  • Operating Ambient Temperature: –40°C to 125°C
• Integrated 2.0A MOSFET
• VIN Range 6V to 42V (LM3406)
• VIN Range 6V to 75V (LM3406HV)
• VIN Range 6V to 75V (LM3406HV-Q1)
• True Average Output Current Control
• 1.7A Minimum Output Current Limit Over Temperature
• Cycle-by-Cycle Current Limit
• PWM Dimming with Dedicated Logic Input
• PWM Dimming with Power Input Voltage
• Simple Control Loop Compensation
• Low Power Shutdown
• Supports All-Ceramic Output Capacitors and Capacitor-less Outputs
• Thermal Shutdown Protection
• TSSOP-14 Package

• Input voltage (type)
• DC/DC
• Topology
• Buck
• Vin (Min) (V)
• 6
• Vin (Max) (V)
• 42
• Iout (Max) (A)
• 1.5
• Iq (Typ) (mA)
• 1.2
• Features
• Adjustable Switch Frequency, Enable/Shutdown, Integrated Switch, Precision Dimming Control, Thermal Shutdown
• Operating temperature range (C)
• -40 to 125
• Dimming method
• 2-Wire, PWM

LM3406的完整型号有：LM3406MH/NOPB、LM3406MHX/NOPB，以下是这些产品的关键参数及官网采购报价：

LM3406MH/NOPB，工作温度：-40 to 125，封装：HTSSOP (PWP)-14，包装数量MPQ：94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LM3406MH/NOPB的批量USD价格：1.253（1000+）

LM3406MHX/NOPB，工作温度：-40 to 125，封装：HTSSOP (PWP)-14，包装数量MPQ：2500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LM3406MHX/NOPB的批量USD价格：1.044（1000+）

LM3406MHEVAL — LM3406 - 用于驱动高功率 LED 的1.5A 恒流降压稳压器评估板

The LM3406 is a buck regulator controlled current source designed to drive a series string of high power, high brightness LEDs (HBLEDs) such as the Luxeon K2 Emitter at forward currents of up to 1.5A. The converter's output voltage adjusts as needed to maintain a constant current through the LED (...)

LM3406 PSpice Transient Model

PSpice for TI 可提供帮助评估模拟电路功能的设计和仿真环境。此功能齐全的设计和仿真套件使用 Cadence 的模拟分析引擎。PSpice for TI 可免费使用，包括业内超大的模型库之一，涵盖我们的模拟和电源产品系列以及精选的模拟行为模型。

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在?PSpice for TI 设计和仿真工具中，您可以搜索 TI (...)