ft3356

ft3356 High Efficiency 6-Channel Charge-Pump LED Driver GENERAL DESCRIPTION The ft3356 is a low noise, high efficiency 6-channel charge-pump LED driver that uses a quad-mode load switch: pass-through (1X), fractional (1.33X/1.5X), or doubling (2X) conversion to maximize efficiency for white LED applications. The ft3356 is capable of driving 6 LED channels from a 2.7V to 5.5V input. The 6 current sinks can operate individually or in parallel for driving higher current LEDs. It requires a minimum number of external components (1μF flying capacitors and two small 1μF capacitors at VIN and VOUT), which makes the device ideal for use in battery-powered portable applications. The ft3356 uses a single-wire pulse interface to enable, disable, and set current for each LED channel with eight settings (20mA down to 50μA) including main and sub-display group control. Each channel output is short-circuit protected. Soft-start circuitry prevents excessive inrush current during start-up. A low po...