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Dual-output switchers with integrated FETs simplify power design

Dallas, Tex. — Texas Instruments Inc. (TI) has introduced four dual-output SWIFT DC/DC step-down converters with integrated FETs that deliver 2 A and 3 A of continuous output current and support input voltages of 4.5 V to 28 V. The switchers are said to speed time to market; reduce external component count and help reduce cost for point-of-load systems used in a variety of applications including HDTVs, set-top boxes and other consumer electronic systems.

The 2-A TPS54283 and TPS54286 and 3-A TPS54383 and TPS54386 SWIFT converters reduce input capacitance by switching each output at 180° out-of-phase at a frequency of 300 kHz (TPS54283 and TPS54286) and 600 kHz (TPS54383 and TPS54386). Each device features current mode control and integrates the compensation components to lower the total number of required external parts. A unique sequencing pin helps designers meet sequencing requirements without additional circuitry by allowing the user to select which output ramps up first or to program both outputs to ramp ratio-metrically.

The dual-channel, non-synchronous converters provide high efficiency and 1.5 percent output voltage accuracy (down to 0.8 V) for each output. With three selectable levels of over-current protection, low on-resistance and a thermal shutdown of 145°C, the devices are said to excel in hot environments where good thermal performance is needed, such as a DLP high-definition digital TV that operates without the use of a cooling fan.

TI also offers the SwitcherPro Software Tool that is available free at www.ti.com/analogelab. The interactive tool includes a bill of materials, reference schematic, loop response graphs and an efficiency curve based on the designer's input.

Availability: All four SWIFT converters are available in volume production. Each device comes in a thermally enhanced 5 x 6-mm, 14-pin HTTSOP package.
Pricing: The TPS54283 and TPS54286 converters are priced at $3.20 each, while the TPS54383 and TPS54386 devices are priced at $3.40 each, both in quantities of 1,000.
Product information: 3-A dual-output SWIFT converters and TPS54xxx family of SWIFT ICs

Texas Instruments , 1-800-477-8924, www.ti.com

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