TPS61027DRCR

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TPS61027DRCR is a very efficient tiny single-chip synchronous step-down DC to DC converter designed specifically for battery powered applications. The device combines a synchronous buck controller, MOSFET drivers, and power MOSFETs in a tiny 5mm x 6mm very thin QFN package, and provides an adjustable output voltage of up to 3.3V with up to 3A of output current capability.

The TPS61027DRCR delivers a high level of efficiency in its operating range of 2.5V to 5.5V. The application field includes ultra-small battery-powered systems, especially those powered by single-cell Li-ion batteries.

Functionality Overview

TPS61027DRCR uses sophisticated high frequency synchronous buck topology to provide high power conversion efficiency. It supports an adjustable output voltage range of 0.8 to 3.3V and provides up to 3A of output current for demanding applications. The device features high accuracy voltage regulation, short-circuit and over-temperature protection, and low-dropout regulation. In addition, the device automatically selects power saving Burst Mode operation with the enable input. During light load operation, the device automatically enters into power saving mode.

Working Principle

TPS61027DRCR works in all 3 phases: conduction, turn-on, and turn-off. The conduction phase is when the input voltage is applied to the switching device and current flows through the output capacitor and load. The turn-on phase is when the input voltage is applied with a high enough magnitude to turn the transistor on. During the turn-on phase, the current through the load and output capacitor are low, and then slowly rise as the gate voltage increases. The turn-off phase is when the transistor is turned off. At this point, the current through the load and output capacitor drop quickly and the voltage across the output capacitor and load will drop to its set point.

TPS61027DRCR has a built-in minimum on-time and maximum off-time control system which ensures that minimum and maximum pulse widths are maintained over a wide range of input and output voltages. This allows the device to maintain a constant switching frequency over the specified range. The output voltage is set using an external resistor divider connected to the feedback pin.

Protection Circuits

TPS61027DRCR provides many protection functions to ensure that the device and system are running safely even under high temperature and stress conditions. The devices have integrated over-temperature protection, over-current protection, and short-circuit protection. The over-temperature protection is designed to monitor the case temperature of the device and will shutdown the DC/DC converter automatically when the temperature exceeds the safety limit. The over-current protection is designed to limit the current at the output of the device and will reduce the output current until it becomes safe and will then reset itself. The short-circuit protection is designed to protect the output from any faults or shorts at the output and will automatically shutdown the DC/DC converter.

Conclusion

TPS61027DRCR is an efficient tiny single-chip synchronous buck power converters designed for battery powered applications that require high efficiency and low output voltage. The device has integrated over-temperature, over-current, and short-circuit protection functions to keep the system running safely and reliably even under high temperature and stress conditions.

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