The LM3464/64A is a 4-channel high voltage current regulator that provides a simple solution for LED lighting applications. The LM3464/64A provides four individual current regulator channels and works in conjunction with external N-channel MOSFETs and sense resistors to give accurate driving current for every LED string. Additionally, the Dynamic Headroom Control (DHC) output can be interfaced to the external power supply to adjust the LED supply voltage to the lowest level that is adequate to maintain all the string currents in regulation, yielding the optimal overall efficiency.

Digital PWM or analog voltage signals can be used to control the duty cycle of the all the channels. When analog control is used, the dimming frequency can be programmed via an external capacitor. A minimum duty cycle control is provided in the conditions that the analog dimming is configured as thermal feedback.

Protection features include VIN under-voltage lock-out, LED open/short circuit and over-temperature fault signaling to the system controller.

• Wide Input Voltage Range
  • 12V-80V (LM3464)
  • 12V-95V (LM3464A)
• Dynamic Headroom Control Ensures Maximum Efficiency
• 4 Output Channels With Individual Current Regulation
• High Channel to Channel Accuracy
• Digital PWM/Analog Dimming Control Interface
• Resistor Programmable Dimming Frequency and Minimum Duty Cycle (Analog Dimming Mode)
• Direct Interface to Thermal Sensor
• Fault Detection
• Over Temperature Protection
• Thermal Shutdown
• Under Voltage Lockout
• Thermal Enhanced TSSOP-28 Package

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• Input voltage (type)
• DC Linear, DC/DC
• Topology
• Current Sink, Multi-Channel
• Vin (Min) (V)
• 12
• Vin (Max) (V)
• 80
• Iout (Max) (A)
• 4
• Iq (Typ) (mA)
• 2.3
• Features
• Enable/Shutdown, Thermal Foldback, Thermal Shutdown
• Operating temperature range (C)
• -40 to 125
• Dimming method
• Analog, PWM

LM3464的完整型号有：LM3464MH/NOPB、LM3464MHX/NOPB，以下是这些产品的关键参数及官网采购报价：

LM3464MH/NOPB，工作温度：-40 to 125，封装：HTSSOP (PWP)-28，包装数量MPQ：48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LM3464MH/NOPB的批量USD价格：2.64（1000+）

LM3464MHX/NOPB，工作温度：-40 to 125，封装：HTSSOP (PWP)-28，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LM3464MHX/NOPB的批量USD价格：2.2（1000+）

LM3464EVAL — 4 通道 LED 驱动器评估模块

The LM3464 is a linear LED driver with Dynamic Headroom Control (DHC) technology designed to drive four serial high power / high brightness LED strings. Four individual linear current regulators with low-side N-channel MOSFETs realize regulations of LED currents. The DHC optimizes system efficiency (...)

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