ST1S03PUR

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PMIC (Power Management Integrated Circuits) are essential components in many modern electronic devices. In particular, Voltage Regulators, such as DC (Direct Current) DC (Switching) Regulators, play a critical role in providing reliable power to the devices’ various components.

The ST1S03PUR is one such DCDC Switching Regulator, and it is well suited for use in high voltage, low power applications. It is a synchronous step down regulator that combines low quiescent current, high efficiency and fast transient response in a compact, 8-lead package.

Specifications

The ST1S03PUR is rated for an input voltage of up to 34V and a maximum output current of 4A. It has a typical efficiency of 97.4% and is designed to operate at temperatures from -40°C up to +105°C. The switching frequency is 21 kHz and it has a typical start-up time of 500 ms.

Features

The ST1S03PUR features several features which make it attractive to users:

• Ripple rejection of 45 dB (at 20 kHz)
• Programmable rise/fall current limit
• Soft start circuitry
• Fault protection including under voltage, overcurrent and overtemperature.

Application Field

The ST1S03PUR is well suited for applications in the high voltage, low power range. It can be used in automotive, industrial and consumer applications such as:

• Automotive systems such as ECUs, Body Comfort and Driver Assist Systems
• Industrial systems such as factory automation, safety monitoring and lighting systems.
• Consumer applications such as LED lighting, audio equipment and computers.

Working Principle

The ST1S03PUR is based on a synchronous step-down topology, which means that it reduces the output voltage by switching quickly between two voltage states. In other words, it is a DC to DC converter that takes a high input voltage and steps it down to a lower output voltage. It works by first converting the input voltage to an intermediate DC level, then using a MOSFET switch to step it down to the desired output voltage. The switching is controlled by a pulse-width modulation (PWM) signal, which is generated by an internal oscillator based on the feedback loop.

The advantage of this approach is that it is highly efficient, and can achieve up to 97.4% efficiency. Additionally, it is also capable of providing fast transient responses, making it well suited for applications that require rapid adjustment of the output voltage. Finally, the fact that it operates at a relatively low frequency (21 kHz) makes it an ideal solution for applications where noise levels need to be kept low.

Conclusion

The ST1S03PUR is a highly efficient, low maintenance DCDC switching regulator. It is ideally suited for use in high voltage, low power applications such as automotive, industrial and consumer electronics. When combined with its programmable, simplified drive circuit and fault protection, it is an ideal solution for a wide variety of applications, where reliable power supply is critical.

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