TPS76518D

TPS76518D Application Field and Working Principle

The TPS76518D, a three-terminal adjustable linear regulator from Texas Instruments, is a low-dropout (LDO) with a guaranteed output voltage that can be as low as 1.2 Volts. It is capable of supplying up to 1.8 Amps of current with extremely good load and line regulation characteristics. It has a wide input voltage range of 2.7V to 5.5V, and hence can be used in many applications in different environments. This LDO is specifically designed for low-power electronic applications such as microcontroller and digital signal processors (DSPs).

The TPS76518D operates in two modes- Low Drop Out Mode and Light Load Mode. In the Low Drop Out (LDO) mode, the dropout voltage is less than 300mV (at 2.7V input voltage and 500mA load current) and the LDO mode is ideal for efficient power delivery in medium to low-voltage applications. When the output current falls below 100mA, the TPS76518D automatically switches to the Light Load Mode. This mode allows the TPS76518D to deliver up to 50mA of load current with a low quiescent current and low operating temperature.

The TPS76518D has an input voltage range of 2.7V to 5.5V and a typical output voltage accuracy of ±1%. It also offers thermal shutdown protection and current-limit protection. The typical quiescent current consumption is 20μA, making it one of the most energy-efficient LDOs available today. The output voltage of the regulator can be adjusted using a single resistor.

The typical applications of the TPS76518D include battery-powered devices, portable audio players, PDAs and other low-power systems. This LDO is also ideal for handheld applications such as cell phones and portable computers. The TPS76518D is available in a small 8-pad, 3mmx3mm, QFN package that makes it suitable for space-constrained designs.

Conclusion

In conclusion, the TPS76518D is an adjustable, three-terminal linear regulator with excellent load and line regulation characteristics. It has a very wide input voltage range of 2.7V to 5.5V, and a typical output voltage accuracy of ±1%. Its quiescent current consumption is only 20μA and its operating temperature range is -40°C to +125°C. The TPS76518D supports two modes – Low Dropout and Light Load – wherein it can efficiently deliver up to 1.8 Amps or up to 50mA of current, respectively. This LDO is packaged in a tiny 8-pad, 3mm x 3mm QFN package, thus making it suitable for use in space-constrained designs.