S-13R1D25-A4T2U3

S-13R1D25-A4T2U3 application field and working principle

The S-13R1D25-A4T2U3 is a three-terminal, high-accuracy adjustable linear voltage regulator with EN/trim control for low-power and precision applications. The device incorporates overvoltage crowbar protection, a linear regulator and an auto-adjustable input voltage divider to provide precise, adjustable 2.50V to 5.50V output. The user can set the precise output voltage required through the EN/trim pin.

The S-13R1D25-A4T2U3 is designed to handle up to 6A of continuous current, making it an excellent choice for precision power requirements, such as system power, peripheral power and digital signal processing (DSP) circuits. The device is well suited for applications where low voltage drop and low operating current are important design criteria; such as in battery-powered systems, processor and ASIC power supplies, or as a companion device to voltage converters.

Application Field

The S-13R1D25-A4T2U3 is primarily intended for applications where a precise, adjustable voltage output is needed. Typical applications include:

• Portable systems
• Battery-powered systems
• RF transmitter power supplies
• Circuit protection
• Processor and ASIC power supplies
• Voltage converters

Working Principle

The S-13R1D25-A4T2U3 circuit consists of an adjustable linear regulator and an auto-adjustable voltage divider for setting the output voltage to any of the range 2.50V to 5.50V. The device also includes overvoltage crowbar protection. The regulator works on a modified Buck/Boost system and maintains a nearly constant voltage regulation under most operating conditions.

The VIN pin is connected to the input supply voltage, while the FB pin is connected to the output voltage. An adjustable resistor is connected between the FB pin and ground to adjust the output voltage. When the voltage at the FB pin is higher than the set value (in the presence of current flow), the transistor switches on and the current is removed from the load. Conversely, when the voltage at the FB pin is lower than the set value, the transistor switches off and the current is supplied to the load. This process is repeated in a continuous cycle and thus maintains a nearly constant output voltage, which can be adjusted by the attached resistor.

The S-13R1D25-A4T2U3 also includes overvoltage crowbar protection. This circuit is connected between the VIN pin and GND pins and prevents a voltage spike from damaging the device. When the voltage at the VIN pin exceeds the pre-established value, the circuit is activated and shuts down the device, protecting it from any further damage.

Conclusion

The S-13R1D25-A4T2U3 is an adjustable linear voltage regulator with EN/trim control, enabling precise, adjustable output voltage from 2.50V to 5.50V. The device is suitable for low-power and precision applications such as processor and ASIC power supplies, and battery-powered systems. It also provides overvoltage crowbar protection to keep the device safe from spikes in input supply voltage.