Milpitas, Calif.—Linear Technology's LTC3208 charge pump-based controller, optimized for single cell lithium-ion cellular applications, can deliver up to 1 amp for driving up to 17 LED elements in five displays. These include the main display (1-4 LEDs); a sub display (1-2 LEDs), RGB (1-3 LEDs), camera (1-4 LEDs), and an auxiliary display (1-4 LEDs).
Each display can be independently programmed and dimmed via a two-wire I2C serial interface. The LTC3208 requires just four small capacitors and one resistor to create a tiny, low profile (0.75 mm) solution that takes up less than 34 mm2 of board space.
The LTC3208 automatically optimizes chip efficiency (typically 95 percent) based on the input voltage and the LEDs' forward voltage conditions. The chip powers up in 1x mode and automatically switches to boost mode (1.5x) when any enabled LED current source approaches dropout. A subsequent dropout switches the charge pump into its 2x mode. Maximum currents for the main/sub/RGB/camera/auxiliary displays are set with a single resistor. LED currents are controlled with precision internal current sources. Brightness can be controlled in 256 levels for the main and sub displays, and 4096 color combinations are available for the RGB display.
The product datasheet can be accessed by clicking here.
The LTC3208EUH is available from stock in a 32-lead QFN (5-by-5 mm) package. Pricing starts at $2.55 each in 1k pieces.
Linear Technology, 1-800-4LINEAR, www.linear.com