LM3404 Datasheet | 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 NFET switch with a minimum overtemperature current limit of 1.2A for step-down (Buck) regulators. Hysteretic control with controlled on-time coupled with an external resistor allow the converter output voltage to adjust as needed to deliver constant current to series and series-parallel connected LED arrays of varying number and type. Output current dimming via PWM, broken/open LED protection, low-power shutdown and thermal shutdown plete the feature set. Features Integrated 1.2A NFET 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 pensation Required Separate PWM Dimming and Low Power Shutdown Supports all-ceramic output capacitors and capacitor-less outputs n Thermal shutdown protection n SO-8 Package n n n n n n n n Applications n n n n n LED Driver Constant Current Source Automotive Lighting General Illumination Industrial Lighting Typical Application Connection Diagram 8-Lead Plastic SO-8 Package NS Package Number M08A © 2006 National Semiconductor Corporation DS202054 .national. LM3404/04HV 1.0A Constant Current Buck Regulator for Driving High Power LEDs Physical Dimensions inches (millimeters) unless otherwise noted SO-8 Package NS Package Number M08A National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications. For the most current product information visit us at .national.. LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL PONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL...