1 Features

• Integrated 0.5-A N-channel MOSFET
• VIN Range from 6 V to 42 V (LM3402)
• VIN Range from 6 V to 75 V (LM3402HV)
• 500 mA 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
• VSSOP, SO PowerPAD™ Packages

2 Applications

• LED Drivers
• Constant Current Source
• Automotive Lighting
• General Illumination
• Industrial Lighting

3 Description

The LM3402/HV 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 735 mA (typical) 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 a constant current to series and series - parallel connected arrays of LEDs of varying number and type, LED dimming by pulse width modulation (PWM), broken/open LED protection, low-power shutdown and thermal shutdown complete the feature set.

Device Information

1. For all available packages, see the orderable addendum at the end of the data sheet.

Typical Application Diagram