The LM3409HV is a P-channel MOSFET constant current buck regulator for driving high-brightness LEDs. Manufactured by Texas Instruments (formerly National Semiconductor), it's designed to provide a simple and efficient solution for LED lighting applications. It offers precise constant current control, ensuring consistent brightness and long lifespan for the LEDs.

Applications

• High Brightness LED Lighting
• Automotive Lighting
• General Illumination
• Backlighting
• Signage

Features

• Constant Current Regulation
• Wide Input Voltage Range
• High Efficiency
• Integrated High-Side P-Channel MOSFET
• Hysteretic Control
• Analog and PWM Dimming Capability

Benefits

• Ensures consistent LED brightness and prolongs LED lifespan.
• Adapts to a wide range of power supply voltages.
• Minimizes power loss and heat generation.
• Reduces external component count and simplifies design.
• Provides stable and accurate current regulation.
• Offers flexible dimming options.

The LM3409HV uses a hysteretic control scheme to regulate the LED current. The integrated P-channel MOSFET simplifies the design and reduces the number of external components required. The device can be dimmed using either an analog voltage or a PWM signal. Protection features include over-voltage protection and thermal shutdown.

Technical Specifications:

• Input Voltage Range: 6V to 75V
• Output Current: Adjustable
• Operating Frequency: Up to 1 MHz
• Package: HTSSOP-16