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Product category: Power Supply ICs and Controllers
News Release from: Texas Instruments (April 2001-March 2006) | Subject: TPS6106x family of specialized DC/DC convertors
Edited by the Electronicstalk Editorial Team on 10 November 2004

Smallest white LED power management

Texas Instruments has launched a family of synchronous boost convertors that can power up to five series white LEDs

Extending its ability to support advanced displays in small battery-powered handheld devices, Texas Instruments has launched a family of synchronous boost convertors that can power up to five series white light emitting diodes (LEDs). The ultrasmall, 1.5 x 1.5mm integrated circuits (ICs) allow portable designers to implement the smallest possible inductor-based solution to efficiently power and control white LED backlights in smart phones, PDAs, digital still cameras and other handheld electronics.

The new TPS6106x family of specialised DC/DC convertors support input voltages from 2.7 to 6-V, and can power up to three, four and five series LEDs.

The converters tiny chip scale package and minimum number of required external components enable a power supply circuit solution smaller than many non-inductor-based, charge pump solutions.

The TPS61060, TPS61061 and TPS61062 devices integrate a 400mA power MOSFET and synchronous rectifier, eliminating the need for an external series Schottky diode.

Additionally, the 1MHz fixed switching frequency allows the convertors to work with smaller, low-value external components, such as a 10uH inductor and a 220nF output capacitor.

An external current sense resistor sets the regulated LED current.

A dedicated input in the TPS6106x devices enables simple, wide-range digital brightness control using a host microcontrollers general purpose input/output pin.

The digital dimming technique allows step adjustment of the feedback reference voltage to the regulator.

Alternatively, LED brightness can be controlled by applying a pulsewidth modulation (PWM) signal to the chip enable pin, or by introducing an analog signal to the feedback input.

For maximum safety and protection, the TPS6106x features integrated overvoltage, and short circuit sensing and thermal shutdown.

Each device has a different overvoltage protection threshold (14, 18 and 22.75V) corresponding to the maximum number of series LEDs.

The internal MOSFETs are turned off when the convertors are disabled to prevent current leakage into the LEDs and conserve battery power.

In shutdown, the parts consume less than 3uA.

In addition to the new TPS61060, TPS61061 and TPS61062 convertors, TI offers a wide variety of high-performance power management and analogue products to support white LED backlighting.

For example, the TPS61042 inductive solution supports up to eight series white LEDs and is available in an eight-pin QFN package.

The TPS60230 provides a five-channel, 125mA charge pump solution.

The high-current TPS6102x family of 1.5A switch DC/DC convertors is ideally suited for powering the LED flashes in smart phones and digital still cameras.

Evaluation modules, white LED application notes and TI's Power Management Selection Guide are available at power.ti.com.

The TPS61060, TPS61061 and TPS61062 are available today in volume from TI and its authorised distributors.

Each device is available in an 8-pin, QFN or 8-pin, chip scale package.

Suggested resale pricing in quantities of 1000 is $1.35 for the TPS61060, $1.40 for the TPS61061 and $1.45 for the TPS61062.

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