The LM3697 device supports most hero LCD panel backlight units in the market so as to simplify backlight design. It supports up to 3 strings with 12 LEDs in series for each string: a total of 36 LEDs (depending on the LED forward-drop voltage, 40 V V_{OUT_MAX}). The device also supports exponential and linear dimming mode so as to erase panel twinkling during extreme low-brightness conditions. The LM3697 also supports CABC function to get better backlight performance in video or movie mode. The flexible 500-kHz and 1-MHz switching frequency selections help designers easily use different inductors. Figure 1-1 illustrates the LM3697 LED backlight driver.