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Breakthrough Efficiency and Power Density In TI’s New AC/DC Linear Regulators

TITexas Instruments has expanded its broad portfolio of over 500 linear regulators by introducing a first-of-its-kind smart AC/DC linear regulator. With 75 percent higher efficiency and two times the power density of other linear regulators, this device achieves the best balance between high efficiency and ultra-low noise while shrinking power-supply size.

The fully integrated TPS7A78 linear regulator uses unique switched-capacitor architecture to eliminate discrete components, including external inductors and transformers and miniature circuit breakers and interrupters, for tamper-resistant designs in applications including electronic metering in grid infrastructure and building automation.

The TPS7A78 is a non-isolated linear regulator that delivers up to 0.5 W from AC to DC with smaller, fewer components. This smart design optimizes regulation through an active bridge, switch capacitor and integrated low-dropout regulator (LDO). This design results in higher efficiency and a reduced capacitor size compared to linear regulators in traditional capacitor-drop solutions utilizing a Zener diode.

The Key features and Benefits of the TPS7A78 includes:

  • Low standby power: A unique dynamic active bridge clamp pre-regulates the input voltage for optimal performance to reduce standby power to 10 mW, which is up to 75% lower compared to traditional capacitor-drop solutions.
  • Higher power density: The switched-capacitor architecture eliminates up to 26 discrete components, including the bridge rectifier. This architecture reduces capacitor size by 25% compared to traditional capacitor-drop solutions.
  • Tamper-proof design: The TPS7A78 is free of costly magnetic shielding, thus meeting the International Electrotechnical Commission (IEC) 61000-4-8 standard required by applications such as electronic metering. 

Availability, packaging and pricing

Available through the TI store and authorized distributors, the TPS7A78 is offered in a 14-pin, 5-mm-by-6.5-mm thin-shrink small-outline package (TSSOP) and priced in small reels at US$1.00 in 1,000-unit quantities.

TI will demonstrate the TPS7A78 linear regulator in booth No. 511 at the Applied Power Electronics Conference (APEC) in Anaheim, California, March 18-20, 2019.

For more information including samples, see www.ti.com/TPS7A78-pr.

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