TPS53125PWR Integrated Circuits (ICs)

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TPS53125PWR Application Field and Working Principle

The TPS53125PWR is a single-chip buck controller with an output voltage range of 0.6V to 5.5V from the Texas Instruments company. The device can drive four to 10 synchronous rectifying MOSFETs and has an internal current-mode synchronous control to provide typical efficiencies of up to 95% for an even greater savings and extended battery life. The device also features an output voltage adjustable via an external resistor divider, fast start up and precise operational control at as low as 1.8V. The TPS53125PWR’s broad input voltage range of 2.65V to 5.5V makes it ideal for applications such as automotive and industrial where supply voltages can range from as low as 2.65V to as high as 5.5V. These features also make the device suitable for other applications such as notebook PCs, PC power, gaming consoles, and telecom equipment.

The TPS53125PWR is specifically designed to provide superior light-load efficiency while achieving a low RDSon of 9 mΩ on-state resistance. With its built-in high-side and low-side current switches and soft-frequency spread spectrum control feature, the device helps designers achieve tight regulation in their light-load, low-noise applications. Furthermore, all of its features are designed to help minimize external components, simplify board layout, and reduce board space and cost.

Working Principle

The TPS53125PWR is a Current-mode Pulse Width Modulation (PWM) synchronous buck converter, capable of providing maximum currents up to 15A. The device includes a non-overlapping bootstrapped gate driver capable of driving both high-side and low-side MOSFETs along with a slew rate control architecture to minimize input and output ripple. An Internal soft-start with a programmable ramp allows for smooth start-up of the converter by ramping from 0 to 100% of the full duty cycle when enabled. This ensures that the converter starts up at a controlled rate in order to minimize any in-rush current.

The operating frequency of the converter is set with the RT pin. The device also provides cycle-by-cycle current limitation and over-temperature protection, ensuring reliable operation of the converter. Additionally, the TPS53125PWR includes a voltage feed-forward feature that helps maintain fast transient response even when enabled in the current-mode control.

Conclusion

The TPS53125PWR is a reliable, single-chip buck controller designed to save board space and cost, as well as improve system efficiency in industrial and automotive applications. it is especially designed to provide superior light-load efficiency and features a wide input voltage range. With its current-mode PWM synchronous operation, it can deliver an output current up to 15A. Moreover, the device includes protection features such as brown-out detection, cycle-by-cycle current limitation and under-voltage lockout. This is the ideal product for design engineers looking to reduce component count and maximize efficiency in their applications.

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