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Features
LM3429Q1 is an Automotive Grade product that is AEC-Q100 grade 1 qualified (-40°C to +125°C operating junction temperature)
VIN range from 4.5V to 75V
Adjustable current sense voltage
High-side current sensing
2Ω, 1A Peak MosFET gate driver
Input under-voltage protection
Over-voltage protection
PWM dimming
Analog dimming
Cycle-by-cycle current limit
Programmable switching frequency
Thermal Shutdown
Description 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 4.5V to 75V. The internal PWM
controller is designed for adjustable switching frequencies of up to 2.0 MHz, thus enabling compact solutions. Additional
features include analog dimming, PWM dimming, over-voltage protection, under-voltage lock-out, cycle-by-cycle current limit,
and thermal shutdown.
The LM3429 comes in a low profile, thermally efficient TSSOP EP 14-lead package.
The LM3429Q1 is an Automotive Grade product that is AEC-Q100 grade 1 qualified
Applications
LED Drivers - Buck, Boost, Buck-Boost, SEPIC
Indoor and Outdoor SSL
Automotive
General Illumination
Constant-Current Regulators
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Design #2 schematic
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