TPS568215RNNR

Application Field and Working Principle

The TPS568215RNNR is a high-efficiency, synchronous, integrated buck converter that supports multiple operating modes, including no-load, pulse-skipping, pulse-frequency modulation (PFM), spread spectrum modulation, and switching between step-down (buck) and buck-boost (inverting) modes. In addition, this device offers a wide range of output voltage settings, adjustable switching frequency, and programmable soft-start.

The TPS568215RNNR is ideal for a wide range of applications from single-cell to multi-cell battery-powered applications including wearable, connectivity and audio applications where low-power loss and space savings are critical.

Operating Principle

The TPS568215RNNR operates using a closed loop control system that helps to regulate output voltage over line, load and temperature variations. A regulated output voltage is generated by sensing the output voltage with a feedback (FB) pin and comparing it to an internal reference voltage in a comparator. The difference between these two voltages, known as an Error Signal, is filtered and applied to the pulse-width modulated (PWM) comparator.

A high-speed on-time control loop further refines the output voltage by setting the on-time of the high-side and low-side transistors. A signals level shifter produces the on times based on the Error Signal. Once the PWM comparator generates an on-time signal, it is passed to the Internal Switching Regulator (ISR), which controls the electrical switch-over between the high-side and low-side switches.

Finally, the output of ISR is sent to the main output drivers, which are responsible for controlling the on-times of the high and low-side transistors. The TPS568215RNNR can turn on the high-side switch for a period of time and then turn off the low-side switch for a period of time. This process continues in a pulsed fashion until the output voltage is in equilibrium with the internal reference voltage.

Features

• Wide voltage range operation: 1.8V to 5.5V
• Ultra-high efficiency up to 97%
• Low ripple and low no-load operating current
• Integrated soft start
• Multiple controlled modes: Pulse Skipping, PFM and Spread Spectrum
• Adjustable switching frequency up to 2MHz
• Operating temperature range of -40°C to +125°C

Conclusion

The TPS568215RNNR is a high-efficiency, synchronous, integrated buck converter that supports multiple operating modes, including no-load, pulse-skipping, PFM, spread spectrum modulation and switching between buck and buck-boost modes. It offers a wide range of output voltage settings, adjustable switching frequency, and programmable soft-start. The TPS568215RNNR is ideal for a wide range of applications from single-cell to multi-cell battery-powered applications including wearable, connectivity and audio applications.