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Details for Texas Instruments


N-Channel Controllers for Constant Current LED Drivers
Buy Directly from Texas Instruments (5404 in Stock)
$1.2300 per unit
Series Information for LM3421MH/NOPB - Texas Instruments


  • feature
    2-u2126, 1-A Peak MOSFET Gate Driver
  • feature
    Cycle-by-Cycle Current Limit
  • feature
    Fault Status Flag and Timer (LM3423/23Q1/23Q0
  • feature
    High-Side Adjustable Current Sense
  • feature
    Input Undervoltage and Output Overvoltage Protection
  • feature
    LED Output Status Flag (LM3423/23Q1/23Q0 Only)
  • feature
    LM3421Q0/LM3423Q0 are Automotive Grade Products That are AEC-Q100 Grade 0 Qualified
  • feature
    LM3421Q1/LM3423Q1 are Automotive Grade Products That are AEC-Q100 Grade 1 Qualified
  • feature
    PWM and Analog Dimming
  • feature
    Programmable Switching Frequency
  • feature
    VIN Range From 4.5 V to 75 V
  • feature
    Zero Current Shutdown and Thermal Shutdown


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 highvoltage 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.


Device Topology:
Boost Buck Buck-Boost Flyback SEPIC
Input Voltage Min:
Input Voltage Max:
Output Voltage Max:
Output Current Max:
Switching Frequency:
IC Mounting:

Alternate Descriptions

Avnet America

LED DRVR 5V/9V/12V/15V/18V/24V 16-Pin TSSOP EP Tube

Avnet America product

Avnet Europe

LED DRVR 5V/9V/12V/15V/18V/24V 16-Pin TSSOP EP Tube

Avnet Europe product

Texas Instruments

N-Channel Controllers for Constant Current LED Drivers

Texas Instruments product