LED Driver with Pre-Emptive Boost for Ultra-High Dimming Ratio and Low Output Ripple

• Automotive AEC-Q100 qualified
• Enhanced fault handling for ASIL B system compliance
• Wide input voltage range of 4.5 to 40 V for start/stop, cold crank, and load dump requirements
• Fully integrated LED current sinks and boost converter with internal power MOSFET
• Operate in Boost or SEPIC mode for flexible output
• Drives up to 11 series white LED in 4 parallel strings, at up to 120 mA per string (VF = 3.3 V max).
• Boost switching frequency synced externally or programmed from 200 kHz to 2.3 MHz
• Clock-Out feature for internal switching frequency
• Adjustable boost frequency dithering to reduce EMI
• Advanced control allows minimum PWM on-time down to 0.3 μs, and avoids MLCC audible noises
• LED contrast ratio: 15,000:1 at 200 Hz using PWM dimming alone, 150,000:1 when combining PWM and analog dimming
• Excellent input voltage transient response even at lowest PWM duty cycle
• Gate driver for optional PMOS input disconnect switch
• Extensive protection against:
  • Shorted boost switch, inductor or output capacitor
  • Shorted FSET or ISET resistor
  • Open or shorted LED pins and LED strings
  • Open boost Schottky diode
  • Overtemperature

Typical Applications

• Automotive Infotainment Backlighting
• Automotive Cluster
• Automotive Center Stack
• Automotive Exterior Lighting