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1.0A Constant Current Buck Regulator for High Power LED Drivers from the PowerWise® Family
National Semiconductor
Description
The LM3404/04HV are monolithic switching regulators designed 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
• Integrated 1.0A MOSFET
• VIN Range 6V to 42V (LM3404)
• VIN Range 6V to 75V (LM3404HV)
• 1.2A Output Current Over Temperature
• Cycle-by-Cycle Current Limit
• No Control Loop Compensation Required
• Separate PWM Dimming and Low Power Shutdown
• Supports all-ceramic output capacitors and capacitor-less outputs
• Thermal shutdown protection
• SO-8 Package, PSOP-8 Package
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