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Analog Devices MAX25024 4-Channel LED Drivers are a 4-channel backlight driver IC with a boost controller for automotive displays. The integrated current outputs can sink up to 150mA LED current each. The device accepts a wide 2.5V to 36V input voltage range and withstands automotive load-dump events. The internal current-mode switching DC-DC controller supports boost or SEPIC topologies and operates in the 400kHz to 2.2MHz frequency range. Analog Devices MAX25024 includes an integrated spread spectrum that helps reduce EMI. An adaptive output-voltage-control scheme minimizes power dissipation in the LED current-sink paths.
Control is included for an external nMOSFET series switch to reduce quiescent current when the backlight is off and to disconnect the boost converter in the case of a fault. The device features I2C-controlled pulse-width-modulation (PWM) dimming and hybrid dimming. In either case, the minimum pulse width is 500ns. Phase-shifted dimming of the strings is incorporated for lower EMI. Comprehensive diagnostic information is available through the I2C interface to ease integration in systems requiring ASIL B compliance. The MAX25024 is available in a 24-pin TQFN or 24-pin side-wettable TQFN (SWTQFN) package and operates over the -40°C to +125°C temperature range.
