LM3421Q1MHX/NOPB

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Texas Instruments

AUTOMOTIVE N-CHANNEL CONSTANT CURRENT LED CONTROLLER WITH SERIES DIM FET DRIVER

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LM3421Q1MHX/NOPB

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Texas Instruments

AUTOMOTIVE N-CHANNEL CONSTANT CURRENT LED CONTROLLER WITH SERIES DIM FET DRIVER

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Description Specifications Series Pricing CAD Documents

Description

General part information

LM3421 Series

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 these controllers 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.

Technical Specifications

Parameters and characteristics for this part

Specification	LM3421Q1MHX/NOPB

Dimming	PWM, Analog
Frequency	2 MHz
Grade	Automotive
Internal Switch(s)	No
Mounting Type	Surface Mount
Number of Outputs	1
Operating Temperature (Max)	125 °C
Operating Temperature (Min)	-40 °C
Package Length	0.173 in
Package Name	16-PowerTSSOP, 16-HTSSOP
Package Width	4.4 mm
Qualification	AEC-Q100
Topology	SEPIC, Step-Down (Buck), Step-Up (Boost)
Type	DC DC Controller
Voltage - Output (Max)	72 V
Voltage - Output (Min)	3 V
Voltage - Supply (Max)	75 V
Voltage - Supply (Min)	4.5 V

LM3421 Series

Automotive N-channel constant current LED controller with series DIM FET driver

Part	Type	Mounting Type	Topology	Voltage - Output (Min)	Voltage - Output (Max)	Package Name	Voltage - Supply (Min)	Frequency	Package Length	Package Width	Number of Outputs	Internal Switch(s)	Voltage - Supply (Max)	Dimming	Operating Temperature (Max)	Operating Temperature (Min)	Supplied Contents	Total Output Count	Output Type	Non-Isolated Output Count	Contents	Utilized IC / Part	Current - Output / Channel	Voltage - Output	Voltage - Input (Maximum)	Voltage - Input (Minimum)	Features	Grade	Qualification
Texas Instruments LM3421MHX/NOPB	DC DC Controller	Surface Mount	SEPIC Step-Down (Buck) Step-Up (Boost)	3 V	72 V	16-HTSSOP 16-PowerTSSOP	4.5 V	2 MHz	0.173 in	4.4 mm	1	No	75 V	Analog PWM	125 °C	-40 °C
Texas Instruments LM3421-SEPICEV/NOPB																	Board(s)	1	Non-Isolated	1 count	Board	LM3421	350 mA	18.9 V	18 V	8 V	Dimmable
Texas Instruments LM3421Q1MH/NOPB	DC DC Controller	Surface Mount	SEPIC Step-Down (Buck) Step-Up (Boost)	3 V	72 V	16-HTSSOP 16-PowerTSSOP	4.5 V	2 MHz	0.173 in	4.4 mm	1	No	75 V	Analog PWM	125 °C	-40 °C												Automotive	AEC-Q100
Texas Instruments LM3421Q1MHX/NOPB	DC DC Controller	Surface Mount	SEPIC Step-Down (Buck) Step-Up (Boost)	3 V	72 V	16-HTSSOP 16-PowerTSSOP	4.5 V	2 MHz	0.173 in	4.4 mm	1	No	75 V	Analog PWM	125 °C	-40 °C												Automotive	AEC-Q100
Texas Instruments LM3421Q0MH/NOPB	DC DC Controller	Surface Mount	SEPIC Step-Down (Buck) Step-Up (Boost)	3 V	72 V	16-HTSSOP 16-PowerTSSOP	4.5 V	2 MHz	0.173 in	4.4 mm	1	No	75 V	Analog PWM	150 °C	-40 °C												Automotive	AEC-Q100
Texas Instruments LM3421MH/NOPB	DC DC Controller	Surface Mount	SEPIC Step-Down (Buck) Step-Up (Boost)	3 V	72 V	16-HTSSOP 16-PowerTSSOP	4.5 V	2 MHz	0.173 in	4.4 mm	1	No	75 V	Analog PWM	125 °C	-40 °C
Texas Instruments LM3421Q0MHX/NOPB	DC DC Controller	Surface Mount	SEPIC Step-Down (Buck) Step-Up (Boost)	3 V	72 V	16-HTSSOP 16-PowerTSSOP	4.5 V	2 MHz	0.173 in	4.4 mm	1	No	75 V	Analog PWM	150 °C	-40 °C												Automotive	AEC-Q100

Pricing

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CAD

3D models and CAD resources for this part

Documents

Technical documentation and resources

Datasheet

LED Drivers for Automotive Exterior Applications (Rev. B)

AN-1982 Small, Wide Input Voltage Range LM2842 Keeps LEDs Cool (Rev. A)

LM3421 SEPIC LED Driver Evaluation Board for Automotive Applications (Rev. B)

AN-1656 Design Challenges of Switching LED Drivers (Rev. A)

AN-1907 LM3423 Buck-Boost Configuration Evaluation Board (Rev. A)