Power Electronics
Step-Down Dc-to-dc Converters Feature Smaller Footprint, Higher Efficiency

Step-Down Dc-to-dc Converters Feature Smaller Footprint, Higher Efficiency

Texas Instruments (TI) introduced the next generation of its integrated triple-output synchronous step-down switching regulators with smaller footprint and higher efficiency. The TPS65261 and TPS65262 DC/DC converters feature small QFN packages and up to 96 percent efficiency for such applications as digital television, set-top boxes, home gateway and access point networks, wireless routers, point-of-sale machines, and surveillance equipment.

The family of DC/DC converters joins TI's family of multi-channel synchronous buck converters that include the TPS65250 and the TPS65251 developed for set-top box applications.

TPS65261 and TPS65262 key features and benefits:

·     Wide 4.5-V to 18-V input supply voltage range for intermediate bus voltages operating off 5-V, 9-V, 12-V or 15-V power buses or batteries.

·     Constant frequency peak current mode simplifies design and enables system optimization.

·     5-mm by 5-mm by 0.9-mm QFN package is 44 percent smaller than previous generation.

·     0.6-V feedback reference supports processors demanding lower output voltage.

·     Integrated automatic power up/down sequencing offers easy power control.

       The TPS65261 provides 82 percent light load efficiency at 10 mA and offers three outputs of rated current at 3A/2A/2A. It features an adjustable 250-kHz to 2-MHz switching frequency with pulse skipping.  For forced continuous current operation pulse skipping, TI offers the TPS65261-1.

      The TPS65262 provides fixed 600-kHz switching operation and offers three outputs of rated current at 3A/1A/1A. Two integrated 200-mA and 100-mA low drop-out voltage linear regulators (LDOs) simplify board layout.  For digital multi-media requiring higher current, TI offers the TPS65262-1 with integrated 350-mA and 150-mA LDOs.

The triple synchronous converters are available in volume now from TI and its authorized distributors. Packaged in a 32-pin QFN package, the TPS65261 is priced at US$1.90 and the TPS65262 is priced at US$2.05 in 1,000-unit quantities..

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