TI Announces TPS61042/TPS61045 Driver/Converter
Texas Instruments Inc. (TI, Dallas, TX) announced a new 28V white light-emitting diode (LED) driver and a liquid crystal display (LCD) boost converter that helps control brightness and improve quality of LEDs and LCDs in portable applications.
The TPS61042 high-frequency white LED driver has a 1.8V to 6V input range, supplies output voltages up to 28V and can drive up to eight white LEDs with a constant current. The driver allows the LED current to be set with an external sense resistor. To control LED brightness, the LED current can be pulsed by applying a pulse-width-modulated signal with a frequency range of 100Hz to 50kHz to a control pin. The control input in the TPS61042 also allows disabling the part and disconnects the LEDs in order to avoid current leakage during shutdown. The device also can be configured so that brightness levels can be controlled by an analog signal.
In addition to the new white LED driver, the TPS61045 adjustable LCD bias boost converter features a digitally programmable output of up to 28V, which allows for precise contrast control of small- to medium-sized LCD displays without the need for any external components. In addition, the TPS61045 provides a true shutdown feature that disconnects the load from the input and provides controlled power up/down sequencing of the display. Both converters feature a high switching frequency of 1MHz. Each device is packaged in a tiny 3mm² x 3mm² QFN package.
The TPS61042 and TPS61045 devices are available now in volume. The devices come in an eight-pin QFN package. Suggested resale pricing in quantities of 1,000 is $1.10 for the TPS61042 and $1.25 for the TPS61045. Evaluation modules are currently available.
