TPS630250RNCT

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The TPS630250RNCT is a low-noise buck converter that has integrated input and output capacitors, making it an excellent choice for a wide range of applications. This device is rated for a maximum output current of 2.5A and a total supply current of less than 10mA. It is available in a 4-pin SOT23 package with a nominal input voltage range of 2.7V to 5.5V. It features logic-level shutdown, a PMOS switch, and protection against load-dump, overvoltage, and over-current. It also includes cycle-by-cycle current limit, soft-start, and output overvoltage protection.

This device is primarily used in current-mode, step-down DC-DC converter applications where performance and total cost of ownership are key factors. The TPS630250RNCT is ideal for cost, size, and power sensitive applications such as consumer electronics, wearables, and point-of-sale equipment. It is well-suited for battery-powered, low-voltage applications such as power-over-Ethernet (PoE) sources, where it can provide up to 25W of output power.

Working Principle

The TPS630250RNCT is a four-pin, synchronous, buck converter. It includes an integrated power switch and synchronous rectification, and uses the current mode control technique. Its switching frequency is internally set to 1.5MHz, and the output voltage is adjustable from 0.6V to VIN, depending on the control pin.

When the device is enabled, an internal pulse width modulation (PWM) comparator senses the voltage of the feedback pin and sends a signal to an internal error amplifier. This error amplifier compares the feedback voltage with the reference voltage of the control pin, and adjusts the duty cycle of the internal PWM. The PWM then generates switching signals to the integrated switch and synchronous rectification, resulting in a regulation of the output voltage.

The device includes over-voltage, over-current, and load-dump protection features. The junction temperature is monitored by an internal temperature sensor and the device will shut down automatically when it reaches a preset threshold. Once the temperature has dropped below the threshold, the device will automatically restart.

Overall, the TPS630250RNCT is an economical and powerful synchronous buck converter that offers excellent performance in a wide variety of applications. It provides a great balance of size, performance, and cost, and is an ideal choice for current-mode, step-down DC-DC converter applications.

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