This PMIC provides the industry’s first integrated power solution for TFT-LCD with synchronous boost, gate shading, and I2C. Its I2C interface offers settings control as well as diagnostics and monitoring. It also has spread-spectrum modulation in the AVDD boost converters, which reduces peak interference and optimizes electromagnetic interference (EMI) performance. Among the backlighting products are the MAX20446 6-channel, I2C LED driver with high-voltage DC-DC controller and battery disconnect. Its integrated current-mode switching controller drives a DC-DC converter that provides the voltage needed for multiple strings of high brightness (HB) LEDs. I2C offers settings control as well as diagnostics and monitoring to support ASIL B requirements. Spread spectrum with phase shifting and hybrid dimming enhances EMI performance. The IC also offers very high dimming ratio for very bright sunlight as well as pitch-dark environments.
Needle-based speedometers, fuel gauges, and the like are quickly becoming things of the past as vehicle dashboards have gone digital. As the auto industry moves toward Level 5 fully autonomous vehicles, functional safety of key vehicle components, such as these digital displays, will be essential. For the underlying display technologies, functional safety is marked by compliance with the ASIL B standard. Automotive-grade ICs that are designed to meet ASIL B criteria can help streamline the design cycle for reliable, high-performing display applications designed to support driver, passenger, and pedestrian safety.
About the author: Szukang Hsien is Executive Business Manager, Automotive Business Unit, Maxim Integrated.