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

LM3423-Q1的完整型号有：LM3423Q0MH/NOPB、LM3423Q0MHX/NOPB、LM3423Q1MH/NOPB、LM3423Q1MHX/NOPB，以下是这些产品的关键参数及官网采购报价：

LM3423Q0MH/NOPB，工作温度：-40 to 150，封装：HTSSOP (PWP)-20，包装数量MPQ：73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LM3423Q0MH/NOPB的批量USD价格：2.281（1000+）

LM3423Q0MHX/NOPB，工作温度：-40 to 150，封装：HTSSOP (PWP)-20，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LM3423Q0MHX/NOPB的批量USD价格：1.901（1000+）

LM3423Q1MH/NOPB，工作温度：-40 to 125，封装：HTSSOP (PWP)-20，包装数量MPQ：73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LM3423Q1MH/NOPB的批量USD价格：1.24（1000+）

LM3423Q1MHX/NOPB，工作温度：-40 to 125，封装：HTSSOP (PWP)-20，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LM3423Q1MHX/NOPB的批量USD价格：1.044（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.

The evaluation board showcases most features of the LM3423 including (...)

LM3423BS2LYEV — 升压 2 层 LED 驱动器评估板

This evaluation board showcases the LM3423 NFET controller used with a boost current regulator. It is designed to drive 9 to 12 LEDs at a maximum average LED current of 700mA from a DC input voltage of 10 to 26V. The evaluation board showcases most features of the LM3423 including PWM dimming, (...)

LM3423 PSpice Transient Model (Rev. A)

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。

借助?PSpice for TI 的设计和仿真环境及其内置的模型库，您可对复杂的混合信号设计进行仿真。创建完整的终端设备设计和原型解决方案，然后再进行布局和制造，可缩短产品上市时间并降低开发成本。

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