TI HIGH-EFFICIENCY CHARGE PUMP WITH I2C INTERFACE DRIVES SEVEN WHITE LEDS
Texas Instruments Incorporated (TI) (NYSE: TXN) has introduced a high-efficiency, constant-frequency charge pump DC/DC converter that uses dual-mode conversion to maximize efficiency over the input voltage range. The tiny 3 mm x 3 mm device provides a fully programmable current with I2C interface for applications, such as cellular phones, PDAs and multi-display handheld devices.
Tiny, Flexible Converter Supports up to Five LEDs for Main Display and Two LEDs for Sub-Displays
TI's TPS60250 drives up to five white LEDs for a main display and up to two white LEDs for a sub-display with regulated constant current for uniform intensity. By utilizing adaptive charge pump modes and very low-dropout current regulators, the TPS60250 achieves high efficiency over the full one-cell lithium-battery input voltage range. Four enable inputs, available through I2C, are used for simple on/off controls for the independent displays. To lower operating current when using one sub-display LED, the device provides completely separate operation in sub-display LEDs.
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