Introduction of TPS61253AYFFR

TPS61253AYFFR is an industry leading, space-winning dc-dc conversion chip from Texas Instruments. It is based on advanced high-efficiency buck topology and designed to provide a very efficient power solution under a wide input voltage range in portable and low power applications. It is highly integrated, including an all-digital PFM control circuit, a high-voltage start-up circuit, an output voltage controlling loop, and an adjustable-voltage LDO output.

Application Field of TPS61253AYFFR

TPS61253AYFFR is a highly integrated, low-cost, high-power dc-dc conversion chip, which is ideal for mobile and embedded applications that require adjustable output voltage and low quiescent current. Its features and targeted applications include:

• Low quiescent current and active load boost provides more battery life for mobile devices such as cell phones, personal digital assistants (PDAs), personal media players, portable game consoles, and digital still cameras.
• High switching frequency and synchronous rectification provide best-in-class efficiency for high-current output.
• Wide input voltage range of 2.7 to 5.5 VDC provides superior performance over the lifetime of the battery.
• High-accuracy 20 mV LDO output provides adjustable output from 0.7 to 6 VDC.
• Enhanced thermal shutdown and over current protection features provide superior reliability for safety critical applications.

Working Principle of TPS61253AYFFR

The TPS61253AYFFR operates with an all-digital PFM control circuit, a high-voltage start-up circuit, an output voltage controlling loop and an adjustable-voltage LDO output. The PFM control circuit switches a high-side FET and the external inductor to create the required power conversion. The voltage across the inductor is continuously monitored and when it reaches the reference voltage the FET is turned off. The PFM controller then re-enables the switch and repeats the cycle as required. The high-voltage start-up circuit allows the chip to start up from an input voltage as low as 2.2V. The output voltage controlling loop keeps the output voltage constant, while the adjustable LDO output provides a very clean and stable output voltage. The TPS61253AYFFR includes an internal compensation network to provide optimal loop stability.

Conclusion

The TPS61253AYFFR is an advanced, high-efficiency DC-DC buck solution. It comes with an integrated all-digital PFM controller, a high-voltage start-up circuit, an output voltage controlling loop and an adjustable-voltage LDO output. Its excellent features and targeted applications make it the perfect choice for space-constrained, high-power mobile and embedded applications that require adjustable output voltages with low quiescent current for improved battery life.