1FEATURES
2• 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

APPLICATIONS
• Streetlights
• Solid State Lighting Solutions

DESCRIPTION
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 lockout,
LED open/short circuit and over-temperature fault
signaling to the system controller.