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The LM3407 is a constant current output floating buck switching converter designed to provide constant current to high power LEDs. The device is ideal for automotive, industrial and general lighting applications. The LM3407 has an integrated power N-MOSFET that makes the application solution compact and simple to implement. An external 1% thick-film resistor allows the converter output voltage to adjust as needed to deliver constant current within 10% accuracy to a serially connected LED string of varying number and type. Converter switching frequency is adjustable from 300 kHz to 1 MHz. The LM3407 features a dimming input to enable LED brightness control by Pulse Width Modulation (PWM). Additionally, a separate enable pin allows for low power shutdown. An exposed pad eMSOP-8 package provides excellent heat dissipation and thermal performance. Input UVLO and output open-circuit protection ensure a robust LED driver solution.
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Features
Input operating range 4.5V to 30V
Output voltage range: 0.1VIN to 0.9VIN
Accurate constant current output
Independent device enable (CMOS compatible) and PWM dimming control
Converter switching frequency adjustable from 300 kHz to 1 MHz
No external control loop compensation required
Supports ceramic and low ESR output capacitors
Input Under Voltage Lock Out (UVLO)
Thermal shutdown protection
eMSOP-8 Package
Applications
LED Driver
Constant Current Source
Automotive Lighting
General Illumination
Industrial Lighting
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