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N-Channel Controllers for Constant Current LED Drivers


Package | PIN: PWP | 20
Temp: Q (-40 to 125)
Carrier: Partial Tube
Qty Price
1-9 $3.18
10-24 $2.87
25-99 $2.67
100-249 $2.34
250-499 $2.19
500-749 $1.86
750-999 $1.57
1000+ $1.50


  • LM3421Q1/LM3423Q1 are Automotive Grade
    Products That are AEC-Q100 Grade 1 Qualified
  • LM3421Q0/LM3423Q0 are Automotive Grade
    Products That are AEC-Q100 Grade 0 Qualified
  • VIN Range From 4.5 V to 75 V
  • High-Side Adjustable Current Sense
  • 2-&3937;, 1-A Peak MOSFET Gate Driver
  • Input Undervoltage and Output Overvoltage
  • PWM and Analog Dimming
  • Cycle-by-Cycle Current Limit
  • Programmable Switching Frequency
  • Zero Current Shutdown and Thermal Shutdown
  • LED Output Status Flag (LM3423/23Q1/23Q0
  • Fault Status Flag and Timer (LM3423/23Q1/23Q0

Texas Instruments  LM3423Q1MH/NOPB

The LM3421 and LM3423 family of devices are versatile high voltage N-channel MOSFET controllers for LED drivers. They can be easily configured in buck, boost, buck-boost and SEPIC topologies. This flexibility, along with an input voltage rating of 75 V, makes the LM3421 and LM3423 devices ideal for illuminating LEDs in a large family of applications.

Adjustable high-side current sense voltage allows for tight regulation of the LED current with the highest efficiency possible. The LM3421 and LM3423 devices use 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 LM3421 and LM3423 devices include a high-voltage start-up 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.