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Product Detailed Parameters
- Description：HIGH BRIGHTNESS LED DRIVER
- Series：-
- Mfr：Microchip Technology
- Package：Tape & Reel (TR)
- Type：DC DC Controller
- Topology：Step-Down (Buck)
- Internal Switch(s)：No
- Number of Outputs：1
- Voltage - Supply (Min)：4.5V
- Voltage - Supply (Max)：40V
- Voltage - Output：-
- Current - Output / Channel：-
- Frequency：2MHz
- Dimming：Analog, PWM
- Applications：LED Lighting
- Operating Temperature：-40°C ~ 125°C (TA)
- Mounting Type：Surface Mount
- Package / Case：8-WDFN Exposed Pad
- Supplier Device Package：8-DFN (3x3)
- Grade：Automotive
- Qualification：AEC-Q100
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Overview
The AT9919K7-GVAO is a high-brightness LED driver IC designed for automotive applications, featuring AEC-Q100 qualification. It utilizes a hysteretic buck topology with high-side current sensing to regulate LED current. The device operates from an input voltage range starting at 4.5 VDC and supports a switching frequency of 2 MHz. It is housed in an 8-lead WDFN package and supplied in tape and reel packaging containing 3300 units.
Feature Summary
- Hysteretic control architecture for stable LED regulation
- High-side current sensing capability
- Automotive-grade reliability with AEC-Q100 certification
Applications
- Automotive exterior lighting systems
- High-brightness LED headlamp modules
- LED tail light assemblies
Procurement Notes
Verify the complete part number including suffixes such as GVAO to ensure correct package type and packing media. Confirm AEC-Q100 compliance requirements match your specific automotive application standards. Check that the 2 MHz switching frequency aligns with your electromagnetic interference constraints. Ensure the WDFN-8 footprint matches your PCB design guidelines before ordering.
Selection Notes
Select this component when a hysteretic buck controller with integrated high-side sensing is required for automotive LED drivers. The 2 MHz frequency allows for smaller passive components compared to lower-frequency alternatives. Verify input voltage compatibility with the vehicle's power system, noting the 4.5 V minimum operating threshold. Consider the thermal performance of the WDFN package for your specific heat dissipation needs.
Part Context
This device belongs to Microchip's family of high-brightness LED drivers designed for robust automotive environments. It shares functional similarities with other models in the series but is distinguished by its specific hysteretic control method and high-side sensing configuration. The AEC-Q100 rating ensures suitability for demanding automotive electronic systems requiring long-term reliability.
Replacement Considerations
Direct substitutes may include other AEC-Q100 qualified hysteretic buck LED drivers from Microchip with compatible pinouts and electrical characteristics. Verify that alternative parts support the same 2 MHz switching frequency and high-side sensing requirements. Ensure the replacement package matches the WDFN-8 form factor for board-level compatibility.
