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)
• 75
• 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

LM3406HV的完整型号有：LM3406HVMH/NOPB、LM3406HVMHX/NOPB，以下是这些产品的关键参数及官网采购报价：

LM3406HVMH/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LM3406HVMH/NOPB的批量USD价格：1.378（1000+）

LM3406HVMHX/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LM3406HVMHX/NOPB的批量USD价格：1.148（1000+）

LM3406HVEVAL — LM3406 - 用于驱动高电流 LED 的 1.5A 高电压恒流降压稳压器 EVM

The LM3406HV is a buck regulator controlled current source designed to drive a series string of high power, high brightness LEDs (HBLEDs) at forward currents of up to 1.5A. The converter`s output voltage adjusts as needed to maintain a constant current through the LED array.

The LM3406HV circuit and (...)

LM3406 PSpice Transient Model

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