TI high-efficiency charge pump with I2C interface drives seven white LEDs

Content Dam Leds En Ugc 2007 07 Ti High Efficiency Charge Pump With I2c Interface Drives Seven White Leds Leftcolumn Article Thumbnailimage File
15245 0 thumb Date Announced: 12 Jul 2007

-- Tiny, Flexible Converter Supports up to Five LEDs for Main Display and Two LEDs for Sub-Displays

DALLAS - Texas Instruments Incorporated (TI) (NYSE: TXN) introduced today 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.

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.

Key Features:
* 3-V to 6-V input voltage range
* 1x and 1.5x charge pump
* Fully programmable current with I2C
o 64 dimming steps with 25 mA maximum (sub and main display banks)
o 4 dimming steps with 80 mA maximum (DM5 for auxiliary application)
* Two percent current matching for sub-LEDs at light load condition
(each 100 µA)
* 750-kHz charge pump frequency
* Continuous 230-mA maximum output current
* Auto-switching between 1x and 1.5x mode for maximum efficiency
* Built-in soft start and current limit
* Open lamp detection
* 16-pin, 3 mm x 3 mm QFN

Pricing and Availability
The TPS60250 is shipping in volume production today from TI and its
worldwide network of distributors and packaged in a 3 mm x 3 mm, 16-pin QFN packaging. Suggested resale price starts at $1.40 in 1,000-unit quantities.

Lighting and Display Solutions
TI provides the broadest portfolio of high-performance products for
today's LED design requirements, along with local support and
applications expertise to help designers get to market faster. TI's LED products include power management, such as AC/DC, power factor
correction, DC/DC and linear power conversion; RF transceivers; digital signal processors (DSPs); and ultra-low-power microcontrollers (MCUs). TI's products support applications ranging from ultra-small portable displays to the largest lighting and display panels in the industry.

Texas Instruments European Product Information Centre Freising, Germany Tel: 49 8161 80 33 11 Fax: 49 8161 80 20 45


Web Site:www.ti.com/tps60250-pr

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