MAX20446C Datasheet

• 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
• Versatile Dimming Scheme Allows Hybrid or PWM-Only Dimming
  • Dimming Ratio > 10000:1 Using Hybrid Dimming
  • 10000:1 Dimming Ratio at 200Hz Using PWM Dimming
• Complete Fault Protection
  • LED Open/Short Detection and Protection
  • Boost Output Undervoltage and Overvoltage
  • Thermal Shutdown
• Compact (4mm x 4mm) 24-Pin TQFN Package

• Infotainment Displays
• Central Information Displays
• Instrument Clusters

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.