N-Channel Controllers for Constant Current LED Drivers - LM3421

LM3421 (ACTIVE)

N-Channel Controllers for Constant Current LED Drivers

 

Recommended alternative parts

  • TPS92691  -  High-side and low-side current sense and series dimming capable, continuous LED current monitoring

Description

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.

Features

  • 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
    Protection
  • 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
    Only)
  • Fault Status Flag and Timer (LM3423/23Q1/23Q0
    Only)

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Parametrics Compare all products in LED Lighting - Illumination

 
Input Voltage (Type)
Vin (Min) (V)
Vin (Max) (V)
Iout (Max) (A)
Vout (Min) (V)
Vout (Max) (V)
Regulated Outputs (#)
Topology
Dimming Method
Type
Switching Frequency (Min) (kHz)
Switching Frequency (Max) (kHz)
Iq (Typ) (mA)
Vref (V)
UVLO Thresholds On/Off (V)
Special Features
Rating
Operating Temperature Range (C)
Pin/Package
Approx. Price (US$)
LM3421 LM3421-Q1
DC/DC    DC/DC   
4.5    4.5   
75    75   
5    5   
3    3   
72    72   
1    1   
Boost
Boost Controller
Buck-Boost
Sepic   
Boost Controller
Buck-Boost Controller
Sepic Controller   
Analog
PWM   
Analog
PWM   
Controller
Inductive   
Inductive   
100    100   
2000    2000   
2    2   
1.24    1.24   
4.17 / 4.08    4.17 / 4.08   
Adjustable Switch Frequency
Enable/Shutdown
Thermal Shutdown   
Adjustable Switching Frequency
Enable/Shutdown
Thermal Shutdown   
Catalog    Automotive   
-40 to 125    -40 to 125
-40 to 150   
16HTSSOP    16HTSSOP   
0.90 | 1ku    1.00 | 1ku   

Other qualified versions of LM3421

Version Part Number Definition
Automotive LM3421-Q1 Q100 devices qualified for high-reliability automotive applications targeting zero defects

WEBENCH® Designer LM3421

  V in Lower V in Upper
4.5 ≤  V  V ≤ 75.0
Ambient Temp  °C ≤ 125°C
Light Output (optional)  Lumens