FEATURES
• Dynamic Headroom Control Output to
Maximize Efficiency
• 6 Channels Current Regulated LED Driver
• High Precision Analog Dimming Control
Interface
• 4 Individual PWM Dimming Control Input
• Dimming Control via Digital Data Bus
• Built-In Maximum MOSFET Power Limiting
Mechanism
• Allows Cascade Operation to Extend the
Output Channels
• Fault Indicator Output
• Thermal Shutdown
• UVLO With Hysteresis
• 48L WQFN Package

KEY SPECIFICATIONS
• Wide supply voltage range (12V-95V)
• Thermal fold-back dimming control
• DHC regulates the lowest MOSFET drain
voltage to 1V

APPLICATIONS
• Streetlights
• Solid State Lighting Solutions

DESCRIPTION
The LM3463 is a six channel linear LED driver with
Dynamic Headroom Control (DHC) interface that is
specialized for high power LED lighting applications.
The variation of the output current of every output
channel in the temperature range of -40°C to 125°C
is well controlled to less than ±1%. The output current
of every channel is accurately matched to each other
with less than ± 1% difference as well.
By interfacing the LM3463 to the output voltage
feedback node of a switching power supply via the
DHC interface, the system efficiency is optimized
automatically. The dynamic headroom control circuit
in the LM3463 minimizes power dissipation on the
external MOSFETs by adjusting the output voltage of
the primary switching power supply according to the
changing forward voltage of the LEDs. Comprising
the advantages of linear and switching converters,
the LM3463 delivers accurately regulated current to
LEDs while maximizing the system efficiency.
The dimming control interface of the LM3463 accepts
both analog and PWM dimming control signals. The
analog dimming control input controls the current of
all LEDs while the PWM control inputs control the
dimming duty of output channels individually.