The LM3421-Q1 and LM3423-Q1 family of devices are versatile high voltage N-channel MOSFET controllers for LED drivers. They can be easily configured in buck, boost, buck-boost and SEPIC topologies. This flexibility, along with an input voltage rating of 75 V, makes the these controllers ideal for illuminating LEDs in a large family of applications.

Adjustable high-side current sense voltage allows for tight regulation of the LED current with the highest efficiency possible. The LM3421-Q1 and LM3423-Q1 devices use predictive off-time (PRO) control, which is a combination of peak current-mode control and a predictive off-timer. This method of control eases the design of loop compensation while providing inherent input voltage feed-forward compensation.

The LM3421-Q1 and LM3423-Q1 devices include a high-voltage start-up regulator that operates over a wide input range of 4.5 V to 75 V. The internal PWM controller is designed for adjustable switching frequencies of up to 2 MHz, thus enabling compact solutions.

• AEC Qualified for Automotive Applications
  • Device Temperature Grade 1: ?40°C ≤ TA ≤ 125°C (LM3421-Q1 and LM3423-Q1)
  • Device Temperature Grade 0: ?40°C ≤ TA ≤ 150°C (LM3421-Q0 and LM3423-Q0)
• VIN Range From 4.5 V to 75 V
• High-Side Adjustable Current Sense
• 2-?, 1-A Peak MOSFET Gate Driver
• Input Undervoltage and Output Overvoltage Protection
• PWM and Analog Dimming
• Cycle-by-Cycle Current Limit
• Programmable Switching Frequency
• Zero Current Shutdown and Thermal Shutdown
• LED Output Status Flag (LM3423-Q1 and LM3423-Q0 Only)
• Fault Status Flag and Timer(LM3423-Q1 and LM3423-Q0 Only)

• Number of channels (#)
• 1
• Topology
• Boost Controller, Buck-Boost Controller, Sepic Controller
• Rating
• Automotive
• Operating temperature range (C)
• -40 to 125, -40 to 150
• Vin (Min) (V)
• 4.5
• Vin (Max) (V)
• 75
• Vout (Min) (V)
• 3
• Vout (Max) (V)
• 72
• Iout (Max) (A)
• 5
• Iq (Typ) (mA)
• 2
• Switching frequency (Max) (kHz)
• 2000
• Features
• Adjustable Switch Frequency, Enable/Shutdown, Thermal Shutdown

LM3421-Q1的完整型号有：LM3421Q0MH/NOPB、LM3421Q0MHX/NOPB、LM3421Q1MH/NOPB、LM3421Q1MHX/NOPB，以下是这些产品的关键参数及官网采购报价：

LM3421Q0MH/NOPB，工作温度：-40 to 150，封装：HTSSOP (PWP)-16，包装数量MPQ：92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LM3421Q0MH/NOPB的批量USD价格：2.33（1000+）

LM3421Q0MHX/NOPB，工作温度：-40 to 150，封装：HTSSOP (PWP)-16，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LM3421Q0MHX/NOPB的批量USD价格：1.942（1000+）

LM3421Q1MH/NOPB，工作温度：-40 to 125，封装：HTSSOP (PWP)-16，包装数量MPQ：92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LM3421Q1MH/NOPB的批量USD价格：1.581（1000+）

LM3421Q1MHX/NOPB，工作温度：-40 to 125，封装：HTSSOP (PWP)-16，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LM3421Q1MHX/NOPB的批量USD价格：1.331（1000+）

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This wide range evaluation board showcases the LM3423 NFET controller used with a buck-boost current regulator. It is designed to drive 4 to 8 LEDs at a maximum average LED current of 700 mA from a DC input voltage of 10 to 70V.

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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 (...)