Analog Devices Inc. MAX20092 12-Switch Matrix Manager IC
Analog Devices Inc. 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. The device features 12x individually controlled N-channel MOSFET switches rated for 10V with an on-resistance of 0.100Ω. A single current source can power all the LEDs connected in series. Individual LEDs can be dimmed by turning the bypass switches across each LED on and off. The IC can also be configured in two strings with six switches in series per string or four strings with three switches per string. A separate current source powers each string. Each switch can be connected across one or two LEDs in series. The IC also includes an internal charge pump that provides power for the gate drive of each LED bypass switch. 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), the master device. Each of the 12x switches can be independently programmed to bypass the LEDs across each switch in the string. Each switch can be turned on, 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 and open- and short-LED fault reporting through the SPI. The MAX20092 is available with a thermally enhanced exposed pad in a 32-pin (5mm x 5mm) side-wettable TQFN (SWTQFN) package.
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 12x switches in series in single-string configurations
- Up to 6x switches in series in dual-string configurations
- Up to 3x switches in series in quad-string configurations
- Up to 2x 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
- Automotive front-light systems
- Automotive tail-light systems
- Automotive matrix-lighting systems
Videos
Simplified Block Diagram
Additional Resources
Related Development Tool
Analog Devices Inc. MAX20092EVSYS Evaluation System
ADI LED dimmer system featuring the MAX20092, a 12-switch matrix LED dimmer IC.