MAX20078
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MAX20078

Synchronous Buck, High-Brightness LED Controller

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Industry's First Automotive Buck Controller with Ultra-Fast Response and Pseudo Fixed-Frequency Regulation

Info: : PRODUCTION tooltip
Info: : PRODUCTION tooltip
Part Details
Part Models 12
1ku List Price Starting From $2.40
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
Additional Details
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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
Part Models 12
1ku List Price Starting From $2.40

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
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Product Lifecycle

PCN

Jul 25, 2022

- 2237

ASSEMBLY

MAX20078AUE+

PRODUCTION

MAX20078AUE+T

PRODUCTION

MAX20078AUE/V+

PRODUCTION

MAX20078AUE/V+T

PRODUCTION

Filter by Model

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Part Models

Product Lifecycle

PCN

Jul 25, 2022

- 2237

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ASSEMBLY

MAX20078AUE+

PRODUCTION

MAX20078AUE+T

PRODUCTION

MAX20078AUE/V+

PRODUCTION

MAX20078AUE/V+T

PRODUCTION

Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

MAX20078EVKIT

Evaluation Kit for the MAX20078

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MAX20078EVKIT

Evaluation Kit for the MAX20078

Evaluation Kit for the MAX20078

Features and Benefits

  • 4.5V to 65V Input Voltage
  • Drives 1 to 16 LEDs
  • 0A to 2A LED Current
  • Demonstrates UVLO, Output Short Protection, and Overload
  • Demonstrates Current-Limit and Thermal-Shutdown Features
  • Proven PCB Layout and Thermal Design
  • Fully Assembled and Tested

Product Detail

The MAX20078 evaluation kit (EV kit) provides a proven design to evaluate the MAX20078 synchronous buck controller for high-power, high-brightness (HB) LED drivers. The EV kit is set up as a buck LED driver and operates from a 4.5V to 65V DC supply voltage. The EV kit is configured to deliver up to 2A to one string of LEDs. The total voltage of the string can vary from 3V to 55V. The anode of the LED string should be connected to the LED+ terminal and the cathode of the LED string connected to PGND.

Applications

  • Automotive Front Lights
  • Automotive Matrix Lights
  • Constant-Current Regulators
  • Head-Up Displays

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