ZLDO1117K25TC Integrated Circuits (ICs)

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PMIC (power management integrated circuits) are widely used in personal electronics areas such as mobiles, tablets, computers and many other personal electronics products. Voltage regulators, as a special kind of PMIC, play an important role in regulating the operating voltage of the system, ensuring safe and stable operation of the whole system. The ZLDO1117K25TC is a high-performance linear voltage regulator. This article introduces the application field and working principle of ZLDO1117K25TC.

Application Field of ZLDO1117K25TC

The ZLDO1117K25TC is a linear voltage regulator designed for low-dropout (LDO) voltage regulation applications in mobile communications, automotive and other portable systems. It can provide a wide range of output currents and can operate in a wide temperature range of -40°C to +85°C. It comes in a 2.25 mm × 2.00 mm WL-CSP package and provides excellent thermal resistance, superior power density, and low profile. It is available up to 100 mA. The ZLDO1117K25TC features an internal circuitry system that eliminates noise and simplifies print design, reducing the cost of the system circuit.

The ZLDO1117K25TC can adjust the output voltage range from 1.4V to 5.5V, and its input voltage range is from 2.6V to 5.5V, making it ideally suited for a variety of applications in mobile, automotive, and other low-voltage systems. It is capable of providing both constant voltage and constant current output, making it suitable for power supply and charging applications, such as USB VBUS protection, where a current set point needs to be maintained or exceeded. It can be used in conjunction with a voltage detection IC to provide over-load current protection and a brown out protection against voltage drops. In addition, the ZLDO1117K25TC has low standby current consumption and enables high-efficiency, low-power operations.

Working Principle of ZLDO1117K25TC

The ZLDO1117K25TC is a low-dropout voltage regulator, which means it can regulate an output voltage that is close to its input voltage. In operation, the device passes current through an internal pass transistor to generate the desired output voltage. The pass transistor is biased by two independent voltage-controlled voltage sources, which provide a high gain and excellent line regulation.

When the device is powered on, the input voltage is applied to the base of the pass transistor, and the internal control circuitry senses the voltage across the sense resistor. The control circuitry adjusts the differential voltage to maintain the required output voltage. When the load current increases, the sense voltage rises and causes the output voltage to fall. The control circuitry then increases the differential voltage, compensating for the voltage drop across the transistor, so that the output voltage remains constant. When the load current decreases, the sense voltage lowers, and the control circuitry reduces the differential voltage so that the output voltage is reduced accordingly.

The ZLDO1117K25TC can help reduce the cost and complexity of a system development by providing efficient voltage regulation and eliminates the need for an external sense resistor. It is highly precise, accurately controlling output voltage over a wide range of loads and line voltages. Furthermore, its internal circuitry eliminates the need for an input capacitor as well as a transient voltage suppression for ESD protection.

Conclusion

The ZLDO1117K25TC is a linear voltage regulator, the application of which is very wide, covering mobile communications and automotive products, and it can be used in conjunction with a voltage detection IC to provide over-load current protection and a brown out protection against voltage drops. It is highly precise and can accurately control the output voltage over a wide range of loads and line voltages. Therefore, the ZLDO1117K25TC can effectively reduce the cost and complexity of system design, and can successfully meet the requirements of mobile, automotive and other low-voltage applications.

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