Product category:
Power Supply ICs and Controllers
News Release from: Texas Instruments (April 2006-) | Subject: TPS61050
Edited by the Electronicstalk Editorial
Team on 14 June 2007
LED driver shrinks space for camera
flashes
Device based on a high-frequency synchronous-boost topology with constant current sink is compact solution for driving single high-brightness white light emitting diodes.
Texas Instruments has released 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 x 1.5 x 0.625mm device uses an inductive fixed-frequency PWM control scheme using small external components, minimising 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 25mm2
This article was originally published on Electronicstalk on 4 Apr 2006 at 8.00am (UK)
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TI's TPS61050 integrated circuit (IC) use a 2MHz switching frequency that allows the use of small and low-profile 2.2uH 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 preset operation modes.
To simplify flash synchronisation 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 0.3uA.
During shutdown, the LED pin is high impedance to avoid leakage current through the LED.
The TPS61050 is shipping in volume production today from TI and its worldwide network of distributors and packaged in a 2 x 1.5mm 12-pin wafer chip scale package or 10-pin QFN.
Suggested resale price starts at US $1.40 in 1000-unit quantities.
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