S-1313A28-A4T1U3 Integrated Circuits (ICs)

S-1313A28-A4T1U3 Application Field and Working Principle

The S-1313A28-A4T1U3 is a highly integrated linear voltage regulator IC with a wide voltage range and low power consumption, specifically designed to satisfy a wide range of consumer, industrial and automotive applications. The S-1313A28-A4T1U3 features an adjustable output voltage range from 0.8 V to 5.0 V. Low quiescent current and excellent line and load regulation characteristics make this device one of the best members of the synchronous step-down converter family.

Typical Application Circuit

The S-1313A28-A4T1U3 is packaged in a very small SOT-25 package with a thermal pad for better conduction. It is designed to provide high output current and fast transient response, making it suitable for applications such as microprocessor systems and other power-sensitive systems.

The following figure displays a typical application circuit in which the S-1313A28-A4T1U3 IC is connected with other components.

Working Principle

The S-1313A28-A4T1U3 is a step-down switching regulator with integrated N-channel power MOSFETs and includes current-mode control and soft start functions. The voltage regulator consists of an internal voltage reference, an error amplifier, a PWM controller, a fast-spreading low-side driver and an RDS(ON) sensing circuit.

The switching frequency is adjustable through an external capacitor. The converter continually compares the feedback voltage to the reference voltage and adjusts the duty cycle accordingly for optimal output voltage regulation. This converter provides a low harmonic switching with a quiescent current of only 2.5 mA and a maximum output current of 1.5A.

Pros and Cons

Some of the key benefits of the S-1313A28-A4T1U3 are its low input voltage, adjustable output voltage, fast transient response and low quiescent current.

The main disadvantage of the S-1313A28-A4T1U3 is that it is not designed for high temperature applications.

Conclusion

The S-1313A28-A4T1U3 is a synchronous step-down converter with a wide input and adjustable output voltage range, low quiescent current and excellent line and load regulation characteristics. It is suitable for applications such as microprocessor systems and other power-sensitive systems.