ZSR400CSTZ Application Field and Working Principle

The ZSR400CSTZ is a 3 Pin Low Dropout (LDO) linear voltage regulator with an output current of 400mA. This device is ideal for GSM base stations and wireless communication products due to its low current consumption, wide input voltage range, very low dropout voltage, and fast transient response. The ZSR400CSTZ features a 2.2uV/V Line Regulation and 0.7% total output accuracy over a temperature range of -40°C to 85°C.

Application Field

The ZSR400CSTZ is ideal for use in applications requiring a low dropout regulator with a high current capability. Common applications include GSM base stations, industrial, consumer electronics and Wireless local loop products. It can also be used in automotive infotainment, cellular handsets, tablet computers, and portable navigation devices.

Working Principle

The ZSR400CSTZ Linear Regulator is designed to produce a constant regulated output voltage from a wide input voltage range of 3.0V to 40V. The device works on the principle of a voltage potential difference on n-p diode bases, resulting in a regulated output voltage. The ZSR400CSTZ is a PNP type device and thus draws current from the output. This current drawn is Rwork/Vin, where Rwork is the internal resistance of the device. The device is fed by the constant current source at the base which draws current from the input source via an external resistance, thus maintaining the internal voltage drop at the device terminals.

Features

Here\'s a list of the ZSR400CSTZ features:

• Input voltage range: 3.0V to 40V
• Output voltage range: 0.8V to 7V
• Output current: 400mA
• Dropout voltage (Vo-Vin): 50mV @ Io = 400mA
• Line regulation: 2.2uV/V
• Load regulation: 12mV/mA @ Vo = 5.0V
• Output current limit: 800mA
• Thermal shutdown protection
• Reverse Polarity Protection
• Stable with a 10uF Output Capacitor

Conclusion

The ZSR400CSTZ Linear Regulator is an ideal choice for GSM base stations and other applications requiring low dropout and high current regulation. Its features make it suitable for a wide range of consumer, industrial, and automotive applications. With its low power consumption, very low dropout voltage, and fast transient response makes it a great choice for use in these applications.