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12-Switch Matrix Manager for Automotive Lighting

Flexible and Fast—Enables Matrix/Pixel Automotive Lighting up to 1.5A

Product Details

The MAX20092 12-switch matrix manager IC for automotive lighting applications includes a 12-switch array for bypassing individual LEDs in a single- or dual-string application. It features 12 individually controlled n-channel MOSFET switches rated for 10V with on-resistance of 0.100Ω. A single current source can be used to power all the LEDs connected in series. Individual LEDs can be dimmed by turning on and off the bypass switches across each LED, and can also be configured in 2 strings with 6 switches in series per string and 4 strings with 3 switches per string. A separate current source powers each string. Each switch can be connected across 1 or 2 LEDs in series. The IC also includes an internal charge pump that provides power for the gate drive of each of the LED bypass switches. The low on-resistance of the switches minimizes conduction loss and power dissipation.

The IC features a serial peripheral interface (SPI) for serial communication. The MAX20092 is a slave device that uses the SPI to communicate with an external microcontroller (µC), which is the master device. Each of the 12 switches can be independently programmed to bypass the LEDs across each of the switches in the string. Each switch can be turned fully on, fully off, or dimmed with or without fade-transition mode. The PWM frequency can be set by an internal oscillator or set to an external clock source. The IC features open-LED protection as well as open- and short-LED fault reporting through the SPI. The MAX20092 is available in a 32-pin (5mm x 5mm) sidewettable TQFN (SWTQFN) package with a thermally enhanced exposed pad.

Design Solution: Improve Matrix Lighting with the Next Generation of LED Controllers and Switches ›


Automotive HB LED Controllers for Matrix and Pixel Lighting

Key Features

  • Automotive Ready: AEC-Q100 Qualified
  • Flexible Configuration Allows the Use of the Same Device in Different Applications
    • Single-, Dual-, and Quad-String Configurations
    • Up to 12 Switches in Series in Single-String Configurations
    • Up to 6 Switches in Series in Dual-String Configurations
    • Up to 3 Switches in Series in Quad-String Configurations
    • Up to 2 LEDs per Switch
  • Optimal PWM Dimming Arrangement Provides Excellent Dimming Performance
    • Programmable 12-Bit PWM Dimming
    • Fade Transition Between PWM Dimming States
    • Internal Clock Generator or External Clock for PWM Dimming
  • Protection Features and Package Improve Reliability
    • Open-LED Protection
    • Programmable Open-LED and Shorted-LED Threshold
    • Open- and Shorted-LED Fault Reporting
    • Thermally Enhanced 32-Pin SWTQFN Package

Applications/Uses

  • Automotive Front-Light Systems
  • Automotive Matrix-Lighting Systems
  • Automotive Tail-Light Systems
Parametric specs for LED Drivers
VIN (V) (min) 4.5
VIN (V) (max) 5.5
Max. No. of LEDs 12
# LED Channels 12
LED Configuration Series-Parallel
ILED per Channel (A) (max) 1.5
PWM Dimming Freq. (kHz) (max) 2
Dimming Control SPI Serial
ICC (mA) (max) 1.3
LED String Volt. (V) (max) 56
Package/Pins TQFN-CU/32
Budgetary
Price (See Notes)
$3.08 @1k
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Simplified Block Diagram

MAX20092: Simplified Block Diagram MAX20092: Simplified Block Diagram Zoom icon

Technical Docs

Design & Development

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Description

The MAX20092 evaluation system is a matrix LED dimmer system featuring the MAX20092 12-switch matrix LED dimmer IC. The system includes two MAX20092 ICs that each control a string of 12 series LEDs. Each LED can be controlled individually or grouped. The user can turn the LED on and off with or without fading. The two strings of 12 series LEDs are driven by the MAX20097, a dual buck controller IC, with a current of 0.5A. The power supply for the dual buck controller is generated from the MAX16990, boost controller IC that is powered by an external 12V supply. For the detailed operation of the MAX20092 IC, refer to the MAX20092 IC data sheet.

View Details

Features

  • Operating Input Supply Range: 9V to 16V
  • Individual and Group Control of LEDs for Turn On, Turn Off, and PWM Dimming
  • Dimming With and Without Fade
  • Phase Shift Capability
  • LED Slew Rate Control for Turn On/Off
  • Open and Short Indication for Each Individual LED
  • Adjustable for Short Thresholds
  • Open Trace Detection
  • Adjustable for PWM Dimming Frequency
  • Thermal Warning and Thermal Shutdown Indication
  • Status Reporting on SPI Errors
  • Individual, Global, or Cluster Write Modes Through the SPI Interface
  • Reporting of LED Binning Resistor (RGRADE)
  • Proven PCB Layout
  • Fully Assembled and Tested

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Support & Training

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Parameters

Parametric specs for LED Drivers
VIN (V) (min) 4.5
VIN (V) (max) 5.5
Max. No. of LEDs 12
# LED Channels 12
LED Configuration Series-Parallel
ILED per Channel (A) (max) 1.5
PWM Dimming Freq. (kHz) (max) 2
Dimming Control SPI Serial
ICC (mA) (max) 1.3
LED String Volt. (V) (max) 56
Package/Pins TQFN-CU/32
Budgetary
Price (See Notes)
$3.08 @1k

Key Features

  • Automotive Ready: AEC-Q100 Qualified
  • Flexible Configuration Allows the Use of the Same Device in Different Applications
    • Single-, Dual-, and Quad-String Configurations
    • Up to 12 Switches in Series in Single-String Configurations
    • Up to 6 Switches in Series in Dual-String Configurations
    • Up to 3 Switches in Series in Quad-String Configurations
    • Up to 2 LEDs per Switch
  • Optimal PWM Dimming Arrangement Provides Excellent Dimming Performance
    • Programmable 12-Bit PWM Dimming
    • Fade Transition Between PWM Dimming States
    • Internal Clock Generator or External Clock for PWM Dimming
  • Protection Features and Package Improve Reliability
    • Open-LED Protection
    • Programmable Open-LED and Shorted-LED Threshold
    • Open- and Shorted-LED Fault Reporting
    • Thermally Enhanced 32-Pin SWTQFN Package

Applications/Uses

  • Automotive Front-Light Systems
  • Automotive Matrix-Lighting Systems
  • Automotive Tail-Light Systems

Description

The MAX20092 12-switch matrix manager IC for automotive lighting applications includes a 12-switch array for bypassing individual LEDs in a single- or dual-string application. It features 12 individually controlled n-channel MOSFET switches rated for 10V with on-resistance of 0.100Ω. A single current source can be used to power all the LEDs connected in series. Individual LEDs can be dimmed by turning on and off the bypass switches across each LED, and can also be configured in 2 strings with 6 switches in series per string and 4 strings with 3 switches per string. A separate current source powers each string. Each switch can be connected across 1 or 2 LEDs in series. The IC also includes an internal charge pump that provides power for the gate drive of each of the LED bypass switches. The low on-resistance of the switches minimizes conduction loss and power dissipation.

The IC features a serial peripheral interface (SPI) for serial communication. The MAX20092 is a slave device that uses the SPI to communicate with an external microcontroller (µC), which is the master device. Each of the 12 switches can be independently programmed to bypass the LEDs across each of the switches in the string. Each switch can be turned fully on, fully off, or dimmed with or without fade-transition mode. The PWM frequency can be set by an internal oscillator or set to an external clock source. The IC features open-LED protection as well as open- and short-LED fault reporting through the SPI. The MAX20092 is available in a 32-pin (5mm x 5mm) sidewettable TQFN (SWTQFN) package with a thermally enhanced exposed pad.

Design Solution: Improve Matrix Lighting with the Next Generation of LED Controllers and Switches ›


Automotive HB LED Controllers for Matrix and Pixel Lighting

Simplified Block Diagram

MAX20092: Simplified Block Diagram MAX20092: Simplified Block Diagram 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