TPS78225DDCT

Current - Output:	150mA
Base Part Number:	TPS78225
Supplier Device Package:	SOT-23-5
Package / Case:	SOT-23-5 Thin, TSOT-23-5
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C
Protection Features:	Over Current, Over Temperature, Reverse Polarity
Control Features:	Enable
PSRR:	40dB ~ 15dB (10Hz ~ 1kHz)
Current - Supply (Max):	8µA
Current - Quiescent (Iq):	1.3µA
Series:	--
Voltage Dropout (Max):	0.25V @ 150mA
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	2.5V
Voltage - Input (Max):	5.5V
Number of Regulators:	1
Output Type:	Fixed
Output Configuration:	Positive
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Introduction

TPS78225DDCT is a low-power linear voltage regulator from Texas Instruments, specifically designed to support a wide range of mixed-signal and digital applications. This regulator provides a precision output voltage of 2V to 6V, with an adjustable voltage input range from 2.95V to 6.5V. It is capable of providing up to 500mA load current and provides excellent protection features including the advanced short-circuit protection and thermal shutdown features for added safety and reliability.

Application Fields

TPS78225DDCT is suitable for a wide range of applications, including digital and mixed-signal designs. It is commonly used in microcontroller and microprocessor-based designs, especially in IoT and embedded designs. In addition, it serves in combination with power amplifiers, RF transmitters, and other operation amplifiers. It is also a great choice for point-of-load (POL) converters and in applications where low noise performance is paramount.

Features

TPS78225DDCT offers the following features:

• Wide adjustable voltage input range: 2.95V to 6.5V
• Precision 2V to 6V output voltage
• High accuracy over temperature
• Soft-start option for fast start-up
• Dropout voltage of only 500mV for 500mA output
• Low-noise performance
• Excellent short-circuit protection
• Thermal shutdown option

Working Principle

TPS78225DDCT is a members of the family of linear voltage regulators. A linear voltage regulator uses a pass element, such as transistor to regulate a voltage. The output voltage is determined by a voltage divider along the pass element. This voltage divider network is connected to a reference voltage to maintain a steady output voltage. Light-load efficiency is not a strong suit of linear regulators. Therefore, TPS78225DDCT uses a low quiescent current design, comprising biasing their control circuitry with a minimum of current to minimize power dissipation. The control circuit monitors the output voltage via a voltage divider, and then adjust the pass element bias appropriately. An internal current source supplies the pass element base drive, based on the control loop’s requirements.The pass element’s output is monitored and compared to the reference voltage. When the output voltage drops, the pass element bias is increased; conversely, when the output voltage is too high, the pass element bias is decreased. The output is therefore driven to the reference voltage at the feedback loop’s output, or the desired load voltage dependent on the voltage divider. The TPS78225DDCT also includes a foldback current limiting feature, which reduces the magnitude of the pass element base drive current at higher output currents. This provides increased protection against short circuits, as it limits the magnitude of the output current. In order to protect against overheating, TPS78225DDCT includes a thermal foldback feature to reduce the output current if the junction temperature exceeds the specified thermal limit. The thermal foldback initiates around 115C, and the output current is reduced to below 500mA at the maximum junction temperature.

Conclusion

The TPS78225DDCT is a low-power linear voltage regulator from Texas Instruments, designed for a wide range of mixed-signal and digital applications. It provides a precision output voltage of 2V to 6V and is capable of providing up to 500mA load current. Its advanced features, such as foldback current limiting and thermal foldback, ensures protection against short circuits and overheating, giving it excellent protection features for added safety and reliability.

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