Backlight LED driver ensures constant display brightness

July 06, 2021 // By Christoph Hammerschmidt
Backlight LED driver ensures constant display brightness
Maxim Integrated's MAX25512 four-channel 120 mA automotive LED driver offers the industry's lowest input voltage and highest efficiency in a single chip.

The MAX25512 four-channel LED driver chip with integrated boost converter is the only solution to date that maintains full, constant brightness of automotive displays even under extreme cold-start conditions with input voltages as low as 3 V, according to manufacturer Maxim Integrated Products. The single-chip LED driver eliminates the need for an external MOSFET and current sense resistor and already includes an I²C interface. This lowers material costs and reduces the required PCB space by 30 percent. The driver module includes four 120 mA channels with the industry's highest efficiency at a frequency of 2.2 MHz.

Today's start-stop systems in motor vehicles save fuel, but pose a challenge to the power supply system because it must maintain the brightness of the display when restarted. For example, functions such as display illumination at start-up can be affected by cold-start conditions: The engine stresses the car battery to the point that the display turns off and on again. The MAX25512, on the other hand, switches down to 3 V after starting without an additional pre-boost converter and thus protects the display from these voltage interruptions, assures the supplier.

The MAX25512 is offered in a compact 24-pin QFN package with dimensions of 4 mm x 4 mm x 0.75 mm. The high integration of the device reduces the size of the solution by 30 per cent by eliminating external components.

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