SPX29502T5-L/TR

SPX29502T5-L/TR Application Field and Working Principle

Introduction

SPX29502T5-L/TR is a low-dropout linear voltage regulator with advanced bi-cell technology in a SOT-23 package featured by low quiescent current operation and excellent load transient response. It provides very high power port efficiency and excellent line and load regulation. The SPX29502T5-L/TR is widely used to regulate the power system in applications including telecoms, consumer electronics, PCs, laptops and any circuit in which high current and low-dropout performance are required.

Application Field

The SPX29502T5-L/TR is designed for use in telecom applications in which a precision control of the output voltage is required, such as in the power supply of PDUs, gateways, repeaters and other kinds of network communications devices. It is also used in a variety of applications such as PDAs, cellular phones, laptop computers and automotive applications, where a low dropout voltage is desirable. It can be used in combination with an MOSFET to create a high-efficient linear voltage regulator, or to construct a P-channel LDO regulator.

In addition, the SPX29502T5-L/TR can be used in conjunction with a low-dropout linear voltage regulator to provide a high-current capacity and high-efficiency power source for portable applications. For instance, SPX29502T5-L/TR can be used with a PNP-enhanced LDO regulator to provide up to 5 A of current output during standby mode in mobile phones. Moreover, the SPX29502T5-L/TR is compatible with a number of other device families and can provide very low quiescent current, fast transient response, and excellent line and load regulation.

Working Principle

The SPX29502T5-L/TR is a CMOS Low Dropout (LDO) linear voltage regulator. It is designed to provide a regulated output voltage of up to 5.5 V and a high level of accuracy even at low input voltage levels. By using a bi-cell technology, the SPX29502T5-L/TR ensures precision voltage control and low quiescent current operation. This is achieved by utilizing a small reference cell and a cleverly designed bi-cell current mirror to achieve a low output voltage noise and fast transient response.

The SPX29502T5-L/TR contains an on-chip voltage reference and an internal current limit protection. The output voltage is temperature compensated for optimal performance over the temperature range. In addition, the device has a built-in power good comparator, which will turn off the output if the input voltage is below a certain level.

The SPX29502T5-L/TR has an adjustable or fixed output voltage with a typical dropout voltage of 140mV at maximum load current of 5A. The load current that is allowed to flow through the SPX29502T5-L/TR is limited by a precise internal current limit circuit. This allows for a wide range of load current (up to 5A) at a whole range of output voltages.

The SPX29502T5-L/TR is designed to perform with a high level of precision and accuracy, even at low input voltages. The device consists of an on-chip reference cell and a high accuracy current mirror to maintain excellent line and load regulation. The voltage reference is temperature compensated for optimum performance over the temperature range.

Conclusion

The SPX29502T5-L/TR is a low-dropout linear voltage regulator featured by low quiescent current operation and excellent load transient response. It delivers very high power port efficiency and reliable line and load regulation, which makes it ideal for applications where accuracy and low dropout are required. It can be used in combination with an MOSFET to construct a high-efficient linear voltage regulator, or with a low-dropout linear voltage regulator to create a high-current capacity and high-efficiency power source for portable applications.