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The ISL97698 is a highly integrated 2-channel LED driver for white LED (WLED) backlit TFT-LCD panels. The device is composed of a synchronous boost converter and two low-side current sinks that are capable of driving an output voltage up to 23.5V and 25mA LED current, per string. The IC operates from an input supply of 2.5V to 5.5V.
The driver features Dynamic Headroom Control that monitors the highest LED forward voltage string to determine the requested boost output voltage. With a controlled low 70mV headroom voltage and low 0.35mA IC supply current, the device provides very high efficiency.
The ISL97698 offers 8-bit linear or 11-bit logarithmic controlled analog output current, with dimming control from a PWM, SWIRE, or I2C interface. Internally, the PWM duty cycle, SWIRE, and I2C digital inputs are converted to a DC LED current. This analog dimming scheme provides high efficiency and eliminates audible noise and PWM dimming related EMI concerns. The ISL97698 also features Content Adaptive Backlight Control (CABC), which uses the product of the PWM and SWIRE, or PWM and I2C, or SWIRE and I2C inputs to determine the LED string current. The I2C interface is also used for configuration settings and fault detection. The ISL97698 incorporates various protections including: open circuit, short circuit, and thermal shutdown.
The device is offered in a 1.39mmx 1.69mm, 3x4 array WLCSP package. It is specified for operation over the -40°C to +85°C ambient temperature range.