Automotive 6-Channel Backlight Driver with Boost/SEPIC Controller and Hybrid Dimming

The MAX20446C is a 6-channel backlight driver with boost controller for automotive displays. The integrated current outputs can sink up to 130mA LED current each. The device accepts a wide 4.5V 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.

The device features pulse-width modulation (PWM) dimming and hybrid dimming. In either case, the minimum pulse width is 500ns. Optional phase-shifted dimming of the strings is incorporated for lower EMI.

The MAX20446C is exceptionally easy to configure using a single resistor on the SET pin.

The device is available in a 24-pin TQFN package and operates over the -40°C to +125°C temperature range.

Applications

* Infotainment Displays

* Central Information Displays

* Instrument Clusters

* Wide Voltage-Range Operation

* Operates down to 4.2V Supply after Startup

* Survives Load Dump up to 52V

* High Integration

* Complete 6-Channel Solution Including Boost Controller

* All Settings Performed with External Components, No Need for Microcontroller Intervention

* Robust and Low EMI

* Spread-Spectrum Oscillator

* Phase Shifting

* 400kHz to 2.2MHz Switching-Frequency Range