The LM3429MHX is a high-voltage current regulator with a wide input voltage range, manufactured by Texas Instruments (formerly National Semiconductor). This device is specifically designed for driving high-brightness LEDs (HBLEDs) in a variety of applications. It is a simple and efficient solution for providing a constant current to one or more LEDs, ensuring consistent brightness and long LED lifespan.

Applications:

• Automotive lighting (e.g., daytime running lights, fog lights)
• General lighting (e.g., architectural lighting, signage)
• Industrial lighting
• LCD backlighting
• LED street lighting

Features:

• Wide input voltage range: 6V to 75V
• High efficiency: Up to 95%
• Constant current regulation
• Hysteresis control
• High-side current sense
• Integrated PWM dimming
• Open LED protection
• Thermal shutdown protection

Benefits:

• Consistent LED brightness: Provides stable current to LEDs, ensuring consistent light output.
• Extended LED lifespan: Regulated current prevents overdriving LEDs, increasing their lifespan.
• High efficiency: Minimizes power losses, resulting in energy savings.
• Simple design: Reduces the number of external components required, simplifying the circuit design.
• Wide application range: Suitable for a variety of lighting applications due to its wide input voltage range.
• Robust protection features: Protects the LEDs and the regulator from overcurrent, overvoltage, and overtemperature conditions.
• PWM dimming capability: Allows for precise control of LED brightness.

Technical Specifications:

The LM3429MHX is a high-voltage current regulator operating from 6V to 75V. It can deliver a constant current to a string of LEDs with high efficiency. It features hysteresis control for stable operation. The device includes open LED and thermal shutdown protection. The current sense is on the high side, simplifying ground connections. The part is available in a thermally enhanced package for better heat dissipation.