TPS78618DCQRG4

Current - Output:	1.5A
Base Part Number:	TPS78618
Supplier Device Package:	SOT-223-6
Package / Case:	SOT-223-6
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C
Protection Features:	Over Current, Over Temperature, Reverse Polarity, Under Voltage Lockout (UVLO)
Control Features:	Enable
PSRR:	59dB ~ 32dB (100Hz ~ 100kHz)
Current - Quiescent (Iq):	385µA
Series:	--
Voltage Dropout (Max):	--
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	1.8V
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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TPS78618DCQRG4 Application Field and Working Principle

The TPS78618DCQRG4 is a monolithic high-voltage, low-dropout linear voltage regulator designed for a wide variety of applications ranging from portable, battery-powered devices to telecom, broadcast, and data communications. This device is implemented with a low-dropout (LDO) design which means it can supply up to 2A of output current with a dropout voltage of only 0.6V (typical). It is capable of supplying output voltages from 1.2V to 5.5V. Additionally, the device offers over current protection and thermal shutdown protection to protect your circuit from catastrophic overloads or over-temperature conditions.The TPS78618DCQRG4 is designed to be very efficient, consuming less power than traditional linear regulators. In addition, the device features low quiescent current (Iq) as well as very low shutdown current (Ishdn) for improved power savings. It also has adjustable output voltage of up to 5.5V with a selectable output voltage selection pin allowing for various output voltages within a single device.The TPS78618DCQRG4 is an excellent choice for applications requiring high-voltage, low-dropout linear regulation. It offers excellent performance in a very small package making it ideal for space-constrained designs. It is also fully RoHS compliant and backed by a 5 year Power Systems IC warranty.

Working Principle

The working principle of the TPS78618DCQRG4 is based on an internal low dropout linear voltage regulator. It utilizes a P/N/N-channel MOSFET as the series pass device. When the output voltage is below the reference voltage, the pass device turns on, allowing current to pass through the regulator. The quiescent current of the device is very low since the input current is only used to drive the series pass device. When the output voltage exceeds the reference voltage, the pass device turns off, increasing the dropout voltage across the regulator. In this state, the pass device is acting as a resistor, allowing current to pass through but slowing down the charging of the output capacitor. This prevents the voltage from exceeding the reference voltage and preserves the regulation.The TPS78618DCQRG4 also features Over Current Protection (OCP) and Thermal Shutdown Protection (TSP) to protect against catastrophic overloads or over-temperature conditions. OCP limits the current through the device to the set current limit in order to protect against short circuit conditions. Thermal shutdown will shut down the device when the junction temperature exceeds 150°C.

Conclusion

The TPS78618DCQRG4 is a high-voltage, low-dropout linear voltage regulator designed for a wide range of applications. It features adjustable output voltage, low quiescent current, and low shutdown current for improved power savings. It also has Over Current Protection and Thermal Shutdown Protection to protect against catastrophic overloads or over-temperature conditions. It is an excellent choice for applications requiring high-voltage, low-dropout linear regulation due to its excellent performance in a very small package.

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