MAX20078
Synchronous Buck, High-Brightness LED Controller
Industry's First Automotive Buck Controller with Ultra-Fast Response and Pseudo Fixed-Frequency Regulation
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Overview
Features and Benefits
- Automotive Ready: AEC-Q100 Qualified
- Wide Input Voltage Range: 4.5V to 65V
- Easy to Design
- No Compensation Components
- Programmable Switching Frequency
- Wide Dimming Ratio Allows High Contrast Ratio
- Analog Dimming
- PWM Dimming
- Suitable for Matrix Lighting
- Maintains Current Regulation While Shorting/Opening Individual LEDs in the String
- Ultra-Fast Response Control Loop Prevents Overshoots and Undershoots
- Fault Detection and Protection
- Overvoltage Protection
- Open and Short Detection
- Thermal Shutdown
- Inductor Current Monitor
- Low-Power Shutdown Mode
Product Details
The MAX20078 is a high-voltage, synchronous n-channel MOSFET controller for high-current buck LED drivers. The device uses a proprietary average current-mode-control scheme to regulate the inductor current. This control method does not need any control-loop compensation while maintaining nearly constant switching frequency. Inductor current sense is achieved by sensing the current in the bottom synchronous n-channel MOSFET. It does not require any current sense at high voltages. The device operates over a wide 4.5V to 65V input range. The device is designed for high-frequency operation and can operate at switching frequencies as high as 1MHz. The high- and low-side gate drivers have peak source and sink current capability of 2A. The driver block also includes a logic circuit that provides an adaptive nonoverlap time to prevent shoot-through currents during transition. The device includes both analog and PWM dimming. The device includes a 5V VCC regulator capable of delivering 10mA to external circuitry. The device also includes a current monitor that provides an analog voltage proportional to the inductor current. The device has a fault flag that indicates open and shorts across the output. Protection features include inductor current-limit protection, overvoltage protection, and thermal shutdown. The MAX20078 is available in a space-saving (3mm × 3mm), 16-pin TQFN or a 16-pin TSSOP package and is specified to operate over the -40°C to +125°C automotive temperature range.
Design Solution: Driver Monitoring Systems Need a New Breed of IR-LED Drivers ›
Design Solution: Achieve Superior Automotive Exterior Lighting with a High-Power Buck LED Controller ›Applications
- Automotive Front Lights
- Automotive Matrix Lights
- Constant-Current Regulators
- Head-Up Displays
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Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
Documentation & Resources
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MAX20078 Reliability Data10/10/2022PDF108K
Design Resources
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
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