The ISL97672B is an integrated 6-channel power LED driver for LCD backlight applications. The ISL97672B is capable of driving LEDs with an input from 4.5V to 26.5V and a maximum output up to 45V.

The ISL97672B employs an adaptive boost switching architecture that allows direct PWM dimming with dimming duty cycle as low as 0.007% at 200Hz or 0.8% at 20kHz. PWM Dimming frequency can be as high as 30kHz.

The ISL97672B employs dynamic headroom control that monitors the highest LED forward voltage string for output regulation to minimize headroom voltage and power loss in a typical multi-string operation. Typical current matching between channels is ±0.7%.

The ISL97672B incorporates extensive protection functions that flag whenever a fault occurs. The protections include string-open and short-circuit detections, OVP, OTP, and an optional output short-circuit protection with external fault disconnect switch.

The ISL97672B is offered in a compact 20 Ld QFN 3x4 package and can operate in ambient temperatures of -40°C to +85°C.
  • 6 x 50mA channels
  • 4.5V to 26.5V input
  • 45V output maximum
  • Adaptive boost switching architecture
  • Direct PWM dimming with dimming linearity of 0.007%~100% at 200Hz or 0.8%~100% <20kHz
  • Adjustable 200kHz to 1.4MHz switching frequency
  • Dynamic headroom control
  • Fault protections with latched flag indication
    • String open/short-circuit
    • Overvoltage Protection (OVP)
    • Over-Temperature Protection (OTP)
    • Optional output short-circuit fault protection switch
      • Notebook displays LED backlighting
      • LCD monitor LED backlighting
      • Multi-function printer scanning light source
      •  
        Alternatives
        ParametersISL97672BISL97672AISL97678ISL97636A
        # of Devices/ Channels6686
        Total Current for DC/DC Lighting300 mA300 mA400 mA210 mA
        Output Current Max/Channel50 mA50 mA50 mA35 mA
        VOUT (max) (V)45454534.5
        Brightness ControlPWMPWMPWMPWM
        VIN (max) (V)26.526.52624
        VIN (min) (V)4.54.54.756
        Backlight for LCD Size (min)0 in0 in0 in0 in
        Backlight for LCD Size (max)17 in17 in17 in17 in
        Qualification LevelStandardStandardStandardStandard
        Peak Efficiency (%)92.992.993.491
        # of LEDs (max)78789660
        Frequency0.6/1.2 MHz0.6/1.2 MHz1.5 MHz1.2 MHz
        IS (max)5 mA5 mA10 mA10 mA
        IQ (max)5 μA5 μA5 μA20 μA
        ISW (typ)2000 mA2000 mA3800 mA2500 mA
        Integrated DiodeNoNoNoNo
        Over Voltage ProtectionYesYesYesYes
        Fault SwitchYesYesNoYes
        TopologiesInductor BoostInductor BoostInductor BoostInductor Boost

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