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LM3404 Datasheet, PDF (1/28 Pages) National Semiconductor (TI) – 1.0A Constant Current Buck Regulator for Driving High Power LEDs | |||
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LM3404/04HV
February 8, 2010
1.0A Constant Current Buck Regulator for Driving High
Power LEDs
General Description
The LM3404/04HV are monolithic switching regulators de-
signed to deliver constant currents to high power LEDs. Ideal
for automotive, industrial, and general lighting applications,
they contain a high-side N-channel MOSFET switch with a
current limit of 1.5A (typical) for step-down (Buck) regulators.
Hysteretic controlled on-time and an external resistor allow
the converter output voltage to adjust as needed to deliver a
constant current to series and series-parallel connected LED
arrays of varying number and type. LED dimming via pulse
width modulation (PWM), broken/open LED protection, low-
power shutdown and thermal shutdown complete the feature
set.
Features
â Integrated 1.0A MOSFET
â VIN Range 6V to 42V (LM3404)
â VIN Range 6V to 75V (LM3404HV)
â 1.2A Output Current Over Temperature
â Cycle-by-Cycle Current Limit
â No Control Loop Compensation Required
â Separate PWM Dimming and Low Power Shutdown
â Supports all-ceramic output capacitors and capacitor-less
outputs
â Thermal shutdown protection
â SO-8 Package, PSOP-8 Package
Applications
â LED Driver
â Constant Current Source
â Automotive Lighting
â General Illumination
â Industrial Lighting
Typical Application
© 2010 National Semiconductor Corporation 202054
20205401
www.national.com
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