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Product Detailed Parameters
- Description：IC LED DRVR RGLTR PWM 4.5A 8SOP
- Series：-
- Mfr：Lumissil Microsystems
- Package：Tape & Reel (TR),Cut Tape (CT)
- Type：DC DC Regulator
- Topology：Step-Down (Buck)
- Internal Switch(s)：Yes
- Number of Outputs：1
- Voltage - Supply (Min)：4.5V
- Voltage - Supply (Max)：38V
- Voltage - Output：-
- Current - Output / Channel：4.5A
- Frequency：-
- Dimming：PWM
- Applications：Lighting
- Operating Temperature：-40°C ~ 125°C (TA)
- Mounting Type：Surface Mount
- Package / Case：8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Supplier Device Package：8-SOP-EP
- Grade：-
- Qualification：-
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Overview
The IS31LT3954-GRLS4-TR is a DC-DC step-down (buck) LED driver IC manufactured by Lumissil Microsystems. It features a single output capable of delivering up to 4.5A of current. The device supports PWM dimming for brightness control and operates within an 8-SOP-EP package.
Feature Summary
- Integrates a buck regulator topology for efficient LED power management
- Supports pulse-width modulation (PWM) dimming for precise brightness adjustment
- Designed for high-current applications with integrated thermal protection
Applications
- General lighting systems requiring constant current regulation
- Automotive interior or exterior illumination modules
- Commercial display backlighting units
Procurement Notes
Verify the exact suffix GRLS4-TR against the manufacturer's latest datasheet to confirm pinout and electrical specifications. Ensure compatibility with the target PCB footprint, specifically the 8-SOP-EP package thermal pad requirements. Cross-reference the part number with official distributor catalogs to avoid counterfeit components and confirm RoHS compliance status prior to ordering.
Selection Notes
Select this component when a monolithic buck converter solution is required for high-current LED strings. The integrated MOSFET simplifies design compared to controller-based solutions. Consider the 4.5A output capability and PWM dimming interface as primary selection criteria for applications needing compact, high-efficiency power regulation without external switching transistors.
Part Context
This part belongs to the Lumissil H-BLED driver portfolio, which addresses general lighting applications through monolithic and controller-based solutions. The series offers flexibility in design with built-in protections for extended life operation, targeting commercial, residential, and automotive markets.
Replacement Considerations
The IS31LT3952-GRLS4-TR and IS31LT3953-GRLS4-TR are related parts in the same family. Verify if lower current ratings or different packaging options in these equivalents meet the specific system requirements before substitution.
