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Updated at 31/10/2025 10:30:15(UTC+8)

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Description

The LM3429MH is a N-channel Controller for constant current 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 controller 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 internal PWM controller is designed for adjustable switching frequencies of up to 2MHz, thus enabling compact solutions. Additional features include analogue dimming, PWM dimming, overvoltage protection, under-voltage lock-out, cycle-by-cycle current limit and thermal shutdown.
Adjustable current sense voltage
High-side current sensing
Input under-voltage protection
Overvoltage protection
PWM dimming
Analogue dimming
Cycle-by-cycle current limit
Programmable switching frequency
This device has limited built-in ESD protection, leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.

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LM3429MH Specifications

Attribute	Attribute Value

Datasheet	Datasheet
3D Model	3D Model
Mounting Style	Surface Mount
Number of Pins	14 Pin
Case/Package	HTSSOP
Supply Voltage (DC)	75.0V (max)
Number of Outputs	1 Output
Input Voltage (DC)	4.50V ~ 75.0V
Output Current	1 A
Number of Positions	14 Position
Switching Frequency	2 MHz
Input Voltage (Max)	75 V
Input Voltage (Min)	4.5 V
Operating Temperature (Max)	125 ℃
Operating Temperature (Min)	-40 ℃
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Product Lifecycle Status	Active
Packaging	Each
RoHS	RoHS Compliant
Lead-Free Status	Lead Free
REACH SVHC Compliance	No SVHC
REACH SVHC Compliance Edition	2015/06/15

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