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Synchronous Buck, High-Brightness LED Controller

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

Product Details

Key Features

Applications/Uses

Parametric specs for LED Drivers
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
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Simplified Block Diagram

Technical Docs

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Parameters

Parametric specs for LED Drivers
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.

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Simplified Block Diagram

MAX20078: Simplified Schematic MAX20078: Simplified Schematic Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .