• LM3429-Q1 is AEC-Q100 Grade 1 Qualified for Automotive Applications
• VIN Range From 4.5 V to 75 V
• Adjustable Current Sense Voltage
• High-Side Current Sensing
• 2-Ω, 1-A Peak MosFET Gate Driver
• Input Undervoltage Protection
• Overvoltage Protection
• PWM Dimming
• Analog Dimming
• Cycle-by-Cycle Current Limit
• Programmable Switching Frequency
• Low Profile 14-lead HTSSOP Package
• Thermal Shutdown

• LED Drivers - Buck, Boost, Buck-Boost, SEPIC
• Indoor and Outdoor SSL
• Automotive
• General Illumination
• Constant-Current Regulators

The LM3429 is a versatile high voltage N-channel MosFET controller for LED drivers. It can be easily configured in buck, boost, buck-boost and SEPIC topologies. This flexibility, along with an input voltage rating of 75V, makes the LM3429 ideal for illuminating LEDs in a very diverse, large family of applications.

Adjustable high-side current sense voltage allows for tight regulation of the LED current with the highest efficiency possible. The LM3429 uses Predictive Off-time (PRO) control, which is a combination of peak current-mode control and a predictive off-timer. This method of control eases the design of loop compensation while providing inherent input voltage feed-forward compensation.

The LM3429 includes a high-voltage startup regulator that operates over a wide input range of 4.5 V to 75 V. The internal PWM controller is designed for adjustable switching frequencies of up to 2 MHz, thus enabling compact solutions. Additional features include analog dimming, PWM dimming, overvoltage protection, undervoltage lock-out, cycle-by-cycle current limit, and thermal shutdown.