Automotive Low Input Voltage IC 4-Channel 150mA Backlight Driver Supporting ASIL B

The MAX25024 is a 4-channel backlight driver IC with 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. Integrated spread spectrum 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.

Applications

* Central Information Displays * Infotainment Displays * Instrument Clusters

* Wide Voltage-Range Operation

* Operates Down to 2.5V Supply After Startup

* Survives Load Dumps Up to 40V

* High Integration

* Complete 4-Channel Solution Including Boost Controller

* I2C Control for Minimum Parts Count

* Robust and Low EMI

* Spread-Spectrum Oscillator

* Phase Shifting

* 400kHz to 2.2MHz Switching-Frequency Range

* nMOS Input Protection Switch

* Multiple Features for ASIL B Systems

* LED-Current Measurement

* Boost Input Current Measurement

* Boost Output Voltage Measurement

* LED Open/Short Detection and Protection

* Boost Output Undervoltage and Overvoltage

* Versatile Dimming Scheme Allows Hybrid or PWM-Only Dimming Using DIM Input or I2C

* Dimming Ratio > 10,000:1 Using Hybrid Dimming

* 10,000:1 Dimming Ratio at 200Hz Using PWM Dimming

* Compact (4mm x 4mm) 24-Pin TQFN and SWTQFN Packages