The one-channel, quad-mode CAT3661 LED driver targets use in ultra-low-power-LED applications, such as portable handheld medical equipment. The device can drive an LED backlight with a current as high as 5 mA. Soft-start current limiting and short-circuit protection make the device a good fit for coin-cell-battery-powered equipment. The CAT3661 comes in a 16-lead TQFN package measuring 3×3×0.8 mm high. A quad-mode charge pump supports input voltages of 2 to 5.5V and helps the CAT3661 achieve peak efficiency as high as 92%. The device also features a typical quiescent current of 150 μA across all operating modes at full load and a 0A current shutdown. The CAT3661 costs 86 cents (10,000). On Semiconductor, www.onsemi.com
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