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Product Detailed Parameters
- Description：IC LED DRIVER CTRLR PWM 20HTSSOP
- Series：-
- Mfr：Texas Instruments
- Package：Tube
- Type：DC DC Controller
- Topology：SEPIC, Step-Down (Buck), Step-Up (Boost)
- Internal Switch(s)：No
- Number of Outputs：1
- Voltage - Supply (Min)：4.5V
- Voltage - Supply (Max)：75V
- Voltage - Output：-
- Current - Output / Channel：-
- Frequency：2MHz
- Dimming：Analog, PWM
- Applications：-
- Operating Temperature：-40°C ~ 125°C (TJ)
- Mounting Type：Surface Mount
- Package / Case：20-PowerTSSOP (0.173", 4.40mm Width)
- Supplier Device Package：20-HTSSOP
- Grade：-
- Qualification：-
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Overview
The LM3423MH/NOPB is a constant current LED driver controller from Texas Instruments, designed for high-performance lighting applications. It supports Boost, Buck, and SEPIC topologies with an input voltage range of 4.5 V to 75 V. The device delivers up to 5 A output current and features an adjustable switching frequency between 100 kHz and 2 MHz. It operates within a temperature range of -40°C to +125°C and is housed in a 20-HTSSOP package.
Feature Summary
- Supports multiple converter topologies including Boost, Buck, and SEPIC for flexible LED string configurations.
- Provides precise constant current regulation for driving high-power LEDs.
- Enables analog and PWM dimming capabilities for brightness control.
- Includes thermal shutdown protection to ensure operational safety.
Applications
- General solid-state lighting systems
- Automotive exterior lighting modules
- Industrial high-bay LED fixtures
Procurement Notes
Verify the specific suffix (e.g., MH vs MHX) against your PCB footprint requirements, as package dimensions differ between HTSSOP and TSSOP variants. Confirm RoHS compliance status through official manufacturer documentation prior to integration. Ensure the selected variant matches the required operating temperature range for your specific application environment.
Selection Notes
Select this component when designing circuits requiring wide input voltage ranges up to 75 V. Consider the 20-pin HTSSOP package for board space constraints. Evaluate the need for analog versus PWM dimming signals during the schematic design phase. Verify that the external inductor and capacitor selections support the desired switching frequency range.
Part Context
This part belongs to the LM3423 series of N-channel controllers for constant current LED drivers. It is functionally related to other variants such as LM3423Q1MH/NOPB, which may offer automotive qualification. The series is distinct from operational amplifiers like the LMV342 or voltage regulators like the LM2734.
Replacement Considerations
LM3423Q1MH/NOPB offers similar functionality with potential automotive qualification differences. LM3423MHX/NOPB utilizes a TSSOP-20 package instead of HTSSOP-20, requiring layout adjustments. Cross-reference datasheets for pinout compatibility before substitution.
