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

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

Apr 17, 2006

DALLAS (April 17, 2006) - 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: 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 V 
  • 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 the 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.