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TI Introduces 1.2A High-Brightness Flashlight LED Driver

Texas Instruments Incorporated Press Release

FlashlightNews.org - 6/13/2007

High-Current LED Driver in Chip Scale Package Minimizes External Component Count

Typical PC board Layout

Typical PC board Layout

DALLAS, Tx. - Texas Instruments Incorporated (TI) (NYSE: TXN) introduced today a device based on a high-frequency synchronous-boost topology with constant current sink to drive single, high-brightness white light emitting diodes (LEDs). The tiny 2 mm x 1.5 mm x 0.625 mm device uses an inductive fixed-frequency pulse-width modulation (PWM) control scheme using small external components, minimizing input ripple current for applications, such as a white LED flash for camera phones, smart phones and PDAs and other general lighting applications and reduces total solution size to less than 25 mm2. See: www.ti.com/sc07107.

TI's TPS61050 integrated circuit (IC) use a 2-MHz switching frequency that allows the use of small and low-profile 2.2-uH inductors. The TPS61050 device operates as a regulated current source, as well as a standard voltage-boost regulator. This additional operating mode can be useful to supply other high-power devices in the system, such as an audio power amplifier, or any other component requiring a supply voltage higher than the battery voltage.

For highest flexibility, the device's LED current or the desired output voltage can be programmed via an I2C compatible interface. The TPS61050 also simplifies design by integrating four pre-set operation modes. To simplify flash synchronization with the camera module, the device offers a trigger pin for fast LED turn-on time. When the TPS61050 is not in use, it enters into shutdown mode via the I2C-compatible interface, reducing the input current to 0.3-uA. During shutdown, the LED pin is high impedance to avoid leakage current through the LED.

Key Features:

  • Four operational modes:
    • Torch and flash up to ILED = 1200 mA
    • Voltage-regulated boost converter: 4.5/5.0/5.25 V
    • Shutdown: 0.3 mA (typ)
  • Total solution circuit area < 25 mm2
  • Up to 96 percent efficiency
  • I2C-compatible interface up to 400 kbps
  • Integrated LED turn-on safety timer
  • Integrated analog to digital converter for LED forward-voltage monitoring
  • Integrated low light dimming mode
  • LED disconnect during shutdown
  • Open/shorted LED protection
  • Over-temperature protection

Pricing and Availability

The TPS61050 is shipping in volume production today from TI and its worldwide network of distributors and packaged in a 2 mm x 1.5 mm, 12-pin wafer chip scale and 10-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, including 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 MCUs. TI's products support applications ranging from ultra-small portable displays to the largest lighting and display panels in the industry. And TI's local support and applications expertise help designers get to market faster.




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