TI Introduces Dual-Output Boost Converters for OLED and White LED Displays

TI Introduces Dual-Output Boost Converters for OLED and White LED Displays

April 19, 2006

Highly Integrated 1.2-MHz Power Conversion ICs Simplify Power Design; Drive up to 12 White LEDs for Backlighting Applications

    DALLAS, April 19 /Xinhua-PRNewswire/ -- Texas
Instruments Incorporated (TI) (NYSE: TXN) introduced today
two new high-efficiency, dual-output DC/DC boost converters
that can manage two sets of six white light emitting diodes
(LEDs) -- all from a single integrated circuit plus
inductor.  The devices feature an input voltage of 3 V to 6
V and can deliver up to 0.7 A of output current, making them
well suited to drive organic LED (OLED) sub-displays and
white LED backlighting for the liquid crystal display (LCD)
main display in today's clamshell phones.  See:
http://www.ti.com/sc06093 . 

    TI's TPS61140 device allows a portable electronics
designer to program each individual voltage and current
level through external resistors. For additional
flexibility, the designer can use each output's dedicated
selection pin to turn them on separately or
simultaneously.

    If the TPS61140's voltage output is enabled, the boost
converter is controlled by pulse frequency modulation (PFM)
to achieve high efficiency over a wide load range.  If the
current output is selected, the device adopts a 1.2-MHz
pulse width modulation (PWM) control method to maximize
output current. Applying an external PWM signal to the
select pin reduces the output current, thereby allowing
white LED dimming.

    High-Efficiency White LED Backlighting

    TI's new TPS61150 high-frequency boost converter with
two regulated current outputs drives white LEDs in LCD
backlights for the sub and main displays in clamshell
phones.  As with the TPS61140, this device's output current
can be reduced by implementing a PWM signal on the select
pins or an analog voltage on the ISET pin, resulting in PWM
dimming of the white LEDs. The TPS61150 regulator's 1.2-MHz
fixed switching frequency reduces output ripple and avoids
audible noises associated with PFM control.  The device's
two outputs can also drive display and keypad backlights,
together driving up to 12 white LEDs in one large display.

    The TPS61140 and TPS61150 eliminate the need for any
external active power components, while maintaining a high
degree of efficiency and design flexibility. The devices
incorporate a power MOSFET and power diode.  In addition,
the high switching frequency reduces the size requirements
of the external inductor and capacitor. 

    Key Features of the TPS61140 and TPS61150:

     -- 3 V to 6 V Input Voltage Range
     -- Two Outputs Each up to 27 Vs
     -- 0.7-A Integrated Switch
     -- Built-in Power Diode
     -- 1.2-MHz PWM for white LED Driver
     -- PFM for OLED Supply
     -- Up to 82 Percent Efficiency
     -- Up to 30 kHz PWM Dimming Frequency
     -- Individually Programmable Output
     -- Input to Output Isolation
     -- Overvoltage and Short-Circuit Protection
     -- Internal Over-Temperature Protection
     -- Undervoltage Protection

    Pricing and Availability

    The TPS61140 and TPS61150 are available in volume
production from TI and its authorized distributors.  The
devices come in a tiny, 10-pin, 3 mm x 3 mm QFN package,
and are priced at $1.85 for the TPS61140 and $1.65 for the
TPS61150 in quantities of 1,000 units.  Evaluation modules
of both converters, application notes and TI's newly
updated Power Management Selection Guide are available
through power.ti.com.

    Portable Power Seminar

    During the month of May, TI will conduct its Portable
Power Design Seminar series in North America.  The one-day
technical seminar will focus on practical design techniques
and will illustrate with application solution examples.
Topics range from basic power conversion topologies to
battery chemistries in today's portable applications.  It
will demonstrate practical, high-performance portable power
design solutions, tools, techniques and topologies based on
available ICs. See: power.ti.com/portabletraining. 

    About Texas Instruments

    Texas Instruments Incorporated provides innovative DSP
and analog technologies to meet our customers' real world
signal processing requirements. In addition to
Semiconductor, the company's businesses include Sensors
& Controls, and Educational & Productivity
Solutions. TI is headquartered in Dallas, Texas, and has
manufacturing, design or sales operations in more than 25
countries. 

    Texas Instruments is traded on the New York Stock
Exchange under the symbol TXN.  More information is located
on the World Wide Web at:  http://www.ti.com .

    Please refer all reader inquiries to: Texas Instruments
Incorporated
                                          Semiconductor
Group, SC-06093
                                          Literature
Response Center
                                          14950 FAA Blvd.
                                          Fort Worth, TX 
76155
                                          1-800-477-8924

    Trademarks

    All other trademarks and registered trademarks belong
to their respective owners.

    For more information, please contact:

     Matt McKinney
     Texas Instruments
     Tel:   [phone]
     Email: [e-mail]

     Jacqi Moore
     Golin/Harris
     Tel:   [phone]
     Email: [e-mail]

SOURCE  Texas Instruments Incorporated