LM3421Q0MHX/NOPB

Voltage - Output:	3 V ~ 72 V
Base Part Number:	LM3421
Supplier Device Package:	16-HTSSOP
Package / Case:	16-TSSOP (0.173", 4.40mm Width) Exposed Pad
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 150°C (TJ)
Applications:	--
Dimming:	Analog, PWM
Frequency:	2MHz
Current - Output / Channel:	--
Series:	Automotive, AEC-Q100
Voltage - Supply (Max):	75V
Voltage - Supply (Min):	4.5V
Number of Outputs:	1
Internal Switch(s):	No
Topology:	SEPIC, Step-Down (Buck), Step-Up (Boost)
Type:	DC DC Controller
Part Status:	Active
Packaging:	Tape & Reel (TR)

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LM3421Q0MHX/NOPB Application Field and Working Principle

PMIC - LED Drivers is a particular type of integrated circuit (IC) which is specifically designed to be used as a constant current source for driving LEDs in a wide range of lighting applications. The LM3421Q0 MHX/NOPB by Texas Instruments is a high-performance LED driver designed specifically for driving up to large battery-powered LED arrays. This LED driver is intended to drive high-brightness LED arrays of various configurations and wavelengths.

Features of LM3421Q0MHX/NOPB

The LM3421Q0MHX/NOPB is a STMicroelectronics device that offers the highest efficiency and performance in aerospace and industrial lighting applications. The device has a low start-up voltage requirement (1V), making it ideal for low-voltage systems and battery-powered applications. The device also provides an output voltage ranging from 0.9V to 6V and operates from an input voltage of 2.6V to 16V. In addition, it is capable of delivering high efficiency current up to 1.2A. The LM3421Q0MHX/NOPB is also equipped with a variety of features, including auto-shutdown thermal protection and over-voltage protection.

Applications of LM3421Q0MHX/NOPB

The LM3421Q0MHX/NOPB is ideal for use in high-density, low-power LED applications such as automotive and aerospace lighting, architectural and industrial lighting, and other portable and battery-powered applications. It is specifically designed to drive up to 8 strings of LEDs in efficient and powerful lighting applications. Moreover, the device is also suitable for applications which require high efficiency and wide input voltage range, such as white and RGB LEDs.

Working Principle of LM3421Q0MHX/NOPB

The LM3421Q0MHX/NOPB operates as a constant-current source with a PWM-dimming option for LED applications. The device utilizes a unique architecture that utilizes two charge pumps and two inverted comparators in order to achieve high efficiency and constant LED current.When the power is applied, the internal charge pump increases the voltage at the external LED+ connection with respect to the LED- connection. When the voltage rises above a given threshold, the inverting comparator will shut down the internal charge pump. This establishes a given headroom voltage, over which the LED current is kept constant by the linear current regulator. When the input voltage is below the given threshold, the constant current source is disabled.The LM3421Q0MHX/NOPB also integrates PWM dimming capability, which is controlled by the DIM pin, allowing the user to adjust the brightness of the LEDs.

Conclusion

The LM3421Q0MHX/NOPB device is an ideal LED driver for powering large LED arrays in a wide range of lighting applications. The device is specifically designed for efficient and constant current operation and is suitable for use in high-efficiency, high-power LED applications. In addition, it is equipped with a variety of features in order to provide optimum protection against thermal, over-voltage and over-load conditions.

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