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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Key Features
Applications/Uses
| VIN (V) (min) | 4.5 |
| VIN (V) (max) | 65 |
| Max. No. of LEDs | 15 |
| # LED Channels | 1 |
| Regulation Topology | Inductor Based |
| LED Configuration | Series |
| ILED per Channel (A) (max) | 30 |
| PWM Dimming Freq. (kHz) (max) | 20 |
| Dimming Ratio (max) | 100000 |
| Dimming Control | Analog Digital PWM |
| VCURR_SENSE (mV) | 200 |
| POUT (W) | 100 |
| ICC (mA) (max) | 50 |
| LED String Volt. (V) (max) | 60 |
| Switching Frequency (kHz) | 250 262 300 500 750 1000 1200 1500 2000 2100 2200 4000 |
| Package/Pins | TQFN-CU/16 TSSOP/16 |
| Budgetary Price (See Notes) | 2.04 |
Simplified Block Diagram
Technical Docs
| Data Sheet | Synchronous Buck, High-Brightness LED Controller | May 23, 2019 | |
| Design Solution | Driver Monitoring Systems Need a New Breed of IR-LED Drivers | ||
| White Paper | Meeting the Power Challenges of General Lighting Applications |
Support & Training
Search our knowledge base for answers to your technical questions.
Filtered SearchOur dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .
Parameters
| VIN (V) (min) | 4.5 |
| VIN (V) (max) | 65 |
| Max. No. of LEDs | 15 |
| # LED Channels | 1 |
| Regulation Topology | Inductor Based |
| LED Configuration | Series |
| ILED per Channel (A) (max) | 30 |
| PWM Dimming Freq. (kHz) (max) | 20 |
| Dimming Ratio (max) | 100000 |
| Dimming Control | Analog Digital PWM |
| VCURR_SENSE (mV) | 200 |
| POUT (W) | 100 |
| ICC (mA) (max) | 50 |
| LED String Volt. (V) (max) | 60 |
| Switching Frequency (kHz) | 250 262 300 500 750 1000 1200 1500 2000 2100 2200 4000 |
| Package/Pins | TQFN-CU/16 TSSOP/16 |
| Budgetary Price (See Notes) | 2.04 |
Key Features
- 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
Applications/Uses
- Automotive Front Lights
- Automotive Matrix Lights
- Constant-Current Regulators
- Head-Up Displays
Description
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 ›
Technical Docs
| Data Sheet | Synchronous Buck, High-Brightness LED Controller | May 23, 2019 | |
| Design Solution | Driver Monitoring Systems Need a New Breed of IR-LED Drivers | ||
| White Paper | Meeting the Power Challenges of General Lighting Applications |
Support & Training
Search our knowledge base for answers to your technical questions.
Filtered SearchOur dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .
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