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Product Detailed Parameters
- Description：BUCK (CUK) LED DRIVER IC
- Series：-
- Mfr：Microchip Technology
- Package：Tape & Reel (TR)
- Type：DC DC Controller
- Topology：Step-Down (Buck), Step-Up (Boost)
- Internal Switch(s)：No
- Number of Outputs：1
- Voltage - Supply (Min)：-
- Voltage - Supply (Max)：75V
- Voltage - Output：-
- Current - Output / Channel：-
- 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)
- Supplier Device Package：8-SOIC
- Grade：Automotive
- Qualification：AEC-Q100
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Overview
The AT9933LG-GVAO is a constant current LED driver IC from Microchip Technology, designed for automotive and lighting applications. It utilizes a hysteretic boost-buck (Cuk) topology to regulate LED current efficiently. The device supports an input voltage range of 9V to 75V and operates within an extended temperature range of -40°C to 125°C. It features PWM dimming capability and is housed in an 8-SOIC package. This component is recommended for automotive design due to its robust performance and reliability under varying electrical conditions.
Feature Summary
- Implements hysteretic boost-buck (Cuk) topology for efficient LED current regulation
- Supports wide input voltage range suitable for automotive battery systems
- Enables precise PWM dimming control for adaptive lighting applications
- Rated for extended industrial and automotive operating temperatures
Applications
- Automotive exterior and interior LED lighting systems
- High-brightness LED drivers requiring buck-boost conversion
- Industrial lighting fixtures with variable input voltages
- Adaptive front-lighting systems (AFLS)
Procurement Notes
Verify the complete part number including suffixes such as GVAO to ensure correct packaging and automotive qualification status. Confirm that the 8-SOIC package matches your PCB footprint requirements. Check for RoHS compliance markings on the datasheet or ordering information. Ensure the supplier provides original manufacturer documentation to validate authenticity. Cross-reference the specific suffix codes with Microchip's official nomenclature guide to avoid functional mismatches.
Selection Notes
Select this component when a single-stage solution for both step-up and step-down LED drive is required. It is suitable for applications where input voltage may fluctuate above or below the LED forward voltage. Consider the thermal performance of the 8-SOIC package for your enclosure design. Verify that the PWM dimming frequency aligns with your system's control interface. Evaluate the hysteretic control loop stability for your specific load conditions.
Part Context
The AT9933 series belongs to Microchip's portfolio of specialized LED driver integrated circuits. These devices are engineered to replace discrete solutions, reducing board space and complexity. The Cuk topology distinguishes them from standard buck or boost converters by providing continuous input and output currents. This family targets high-reliability markets where component longevity and consistent light output are critical.
Replacement Considerations
Direct substitutes should be verified against the official Microchip cross-reference list. Ensure any alternative maintains the same hysteretic boost-buck architecture and 8-SOIC package. Pin-to-pin compatibility must be confirmed before integration. Validate that the replacement meets the same -40°C to 125°C operating temperature range. Check for equivalent PWM dimming specifications and input voltage tolerances.
