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.