ST1S40IPUR Integrated Circuits (ICs)

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The ST1S40IPUR is a low-cost, low-power, high-efficiency single-channel synchronous step-down DC-DC switching regulator. The ST1S40IPUR contains an internal 48-V power MOSFET and an internal voltage detection circuit that provides fast transient response and high-efficiency operation. The device is specifically designed for low-voltage system applications which need megawatt power, such as automotive, industrial and medical applications.

Application Field

The ST1S40IPUR provides a high-efficiency DC-DC step-down conversion solution for a wide range of applications, including automotive, industrial and medical systems. This device is well suited for applications that require low-noise, fast transient response and high efficiency DC-DC regulation, such as start-stop vehicle systems, advanced driver assistance systems (ADAS), engine control units (ECU) and landscape lighting.

Working Principle

In general, a typical synchronous step-down DC-DC regulator contains two components: a power MOSFET and a controller. The power MOSFET takes in the input voltage and converts it to a controllable voltage after switching and regulating. The controller is then responsible for the proper timing and on/off regulation of the power MOSFET.

The ST1S40IPUR uses a dedicated integrated circuit to control the power MOSFET switching. It utilizes the “smartStep” algorithm to adjust the on-time of the power MOSFET according to the output voltage feedback signal. The switching frequency is also automatically adjusted to provide optimal noise performance and efficient operation.

In addition, the ST1S40IPUR also contains an integrated voltage detect circuit. This circuit accurately monitors the output voltage and provides quick response for transient events. This ensures a clean and stable output voltage at all times, even in the presence of large input voltage transient events.

Finally, the ST1S40IPUR uses a hysteretic and foldback current limit to protect against any current surges and to enhance efficiency. This device is also capable of operating in temperature ranges of -40°C to 125°C, making it ideal for use in automotive and industrial applications.

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