TPS621351RGXT

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TPS621351RGXT is a type of DC-DC switching regulator offered by Texas Instruments. It is designed to work seamlessly with various microcontrollers, processors and application-specific integrated circuits (ASICs) that require a highly accurate voltage source. It is a cost-effective solution for applications that require high power density and current regulation.

The TPS621351RGXT is a two-phase interleaved buck converter with a voltage-mode PWM controller, which is capable of regulating output voltages from 0.8V to 5.5V. The converter’s transition mode operation reduces the output voltage ripple and enable the use of very low ESR ceramic output capacitors for high efficiency. It supports a wide input voltage range from 4.5V to 18V, making it suitable for applications in 5V, 12V or 24V powered systems. The TPS621351RGXT also incorporates a selectable current limit circuit for load transient protection and an adaptive on-time control for output stability over a wide range of loads.

The device also has an integrated 175mΩ MOSFET, which can be used as an external supply switch. It also runs reliably in extreme temperatures, as it supports a wide operating temperature range of -40°C to +125°C. Other features of the TPS621351RGXT include a programmable gain stage, an adjustable operating frequency and an internal soft start circuit.

The TPS621351RGXT is suitable for a wide range of applications, such as telecom and industrial power supplies, adapters and USB PD power supplies, battery management systems and other applications where high power density and current regulation is needed in limited space.

The TPS621351RGXT\'s working principle begins with an external resistor connected from the FB pin to common mode output. The output voltage is regulated by varying the duty cycle of the pulse width modulation (PWM) generator to maintain the output voltage on the FB pin. Meanwhile, the external resistor will convert the voltage to the FB pin to a current that is proportional to the output voltage. The current is monitored and compared against the current set point, and the PWM duty cycle is modified to match the two currents.

When the load current decreases, the PWM duty cycle reduces, and the output voltage decreases. If the load current increases, the PWM duty cycle increases, and the output voltage increases to maintain the FB feedback voltage. This process maintains the output voltage accuracy and minimizes output voltage ripple.

The TPS621351RGXT helps engineers to increase the system\'s power density, improve the overall system compliance, reduce electromagnetic interference (EMI) and offer more dynamic response to load transients. Furthermore, its internal protection circuitry helps to prevent transients, overloads and thermal shutdowns, and make it a safe and reliable solution for a wide range of applications.

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