MT3371BS1

MT3371BS1 Application Field and Working Principle

MT3371BS1 is an integrated bipolar linear voltage regulator IC designed for the telecommunication system. It is a two-stage monolithic integrated circuit (IC) specifically designed for supply voltage stabilization, frequency stabilization, and power supply for battery management. The MT3371BS1 is a Level-1 voltage regulator IC utilizing a bipolar LDMOS transistor for the control and power stage of the device.

The MT3371BS1 is mainly used in telecommunication systems to adjust the variable voltage power after the regulator module has been connected to the load. This IC can provide voltage regulation and overcurrent protection with a highly stable output voltage and low noise operation. The IC takes a few nanoseconds to adjust the output voltage and can accurately maintain the output voltage within a few µV of the set-point voltage.

Application Field

The MT3371BS1 is mainly used for power supply and voltage stabilization in a variety of communication systems applications. It can be used for the following: A GSM module control unit, a wireless modem power supply system, CDMA wireless local loop base station, a modem bank control unit, a CDMA/TDMA wireless telephone, a GSM/CDMA radio transmitter, and a CDMA base station.

This linear voltage regulator IC is also suitable for use in other power supply circuits such as LED lighting, DC-DC converters, lithium-ion batteries, and automotive applications. With the unparalleled low noise operation, high efficiency, and high output current, the MT3371BS1 can be applied almost anywhere a stable power supply is needed.

Working Principle

The basic concept of the MT3371BS1 can be divided into two stages: the power stage and the control stage. The power stage is built around the bipolar LDMOS transistor and its purpose is to deliver the current from the input side to the output side. The control section ensures a precise output voltage level at all times.

The MT3371BS1 has two main operating modes: linearly regulated mode and feedback control mode. In the linearly regulated mode, the output voltage is controlled directly by current flowing through the control circuit. In the feedback control mode, the voltage is monitored and compared against the set point voltage. If there is a discrepancy, the control circuit adjusts the current to compensate for the difference so that the voltage remains the same.

The MT3371BS1 has a few other features such as thermal protection, overcurrent protection, current limiting, and high cut-off frequencies. The thermal protection feature is used to protect the IC from overheating while the overcurrent protection keeps the voltage stable even if a large current is drawn. The current limiting feature helps prevent damage caused by excessive current while the high cut-off frequency ensures a low noise operation.

Conclusion

The MT3371BS1 integrated bipolar linear voltage regulator IC is ideal for use in telecom systems including GSM modules, wireless modems, and CDMA/TDMA telephones. The highly stable output voltage, low noise operation, and many protective features make the IC suitable for use in many applications.