TPS78405KTTR

Voltage Dropout (Max):	0.25V @ 150mA
Base Part Number:	TPS78405
Supplier Device Package:	DDPAK/TO-263-5
Package / Case:	TO-263-6, D²Pak (5 Leads + Tab), TO-263BA
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 - Output:	400mA
Series:	--
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	5V
Voltage - Input (Max):	42V
Number of Regulators:	1
Output Type:	Fixed
Output Configuration:	Positive
Part Status:	Obsolete
Packaging:	Tape & Reel (TR)

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Introduction

In this article, we will explore the application fields and the working principle of the TPS78405KTTR, a linear voltage regulator from Texas Instruments’ Power Management IC (PMIC) family that provides an economical and straightforward solution for integrated power conversion design. By integrating a low dropout regulator, voltage reference, and power-on reset, the TPS78405KTTR can provide efficient voltage regulation with various input and output voltage configurations.

Features and Application Fields

The TPS78405KTTR is specifically designed to provide regulated voltage from low-noise and low-dropout applications. With its ultra low quiescent current of only 100nA and a high accuracy regulation of ±1.5%, the TPS78405KTTR is a great choice for a wide variety of applications including medical, automotive, and industrial power management designs. The TPS78405KTTR also offers high PSRR, with as much as 66dB at 1kHz, providing noise suppression in noisy environments in which the input supply is subject to noise generated by other components. The device also offers an integrated power-on reset circuit, allowing the designer to perform an initial power-up reset. The TPS78405KTTR linear regulator offers a wide variety of input and output voltage configurations, with inputs ranging from 1.5V to 5.5V and outputs ranging from 0.8V to 5.5V. The device also offers various protection features to ensure reliable operation: reverse battery protection, thermal protection, and current limit protection. With its small size and package, the TPS78405KTTR is great for space-constrained designs and fits in the smallest of form factors.

Working Principle

To understand how the TPS78405KTTR operates, it is important to understand the working principle of the linear regulator. At the heart of the device is an error amplifier, which takes the reference voltage and current from an external voltage source and compares it to the output voltage of the device. The error amplifier sends the difference between the two voltages to a power transistor, which acts as a short circuit between the input and output when the output voltage deviates from the desired voltage level. The error amplifier is also responsible for maintaining the output voltage during load transients, when the output load has changed, or when the input voltage or temperature changes. When the output load or input voltage drops, the error amplifier will increase the output voltage to prevent excessive current from flowing out of the device. This principle of error correction is the basis of linear regulation and is used by the TPS78405KTTR to ensure that the output voltage remains regulated in a variety of conditions. The TPS78405KTTR also utilizes a special feature known as a low dropout regulator. A low dropout regulator allows the device to maintain its output voltage even when the input voltage is lower than the output voltage. This is accomplished by using a P-channel power transistor in the error amplifier circuit. When the input voltage falls below the output voltage, the P-channel transistor acts like a resistor, dissipating the excess current and maintaining the output voltage. This allows the TPS78405KTTR to maintain the output voltage even in low-voltage conditions.

Conclusion

The TPS78405KTTR is an efficient, economical, and reliable linear voltage regulator designed to provide regulated voltage from low-noise and low-dropout applications. With its ultra low quiescent current and robust protection features, it is a great choice for space-constrained designs demanding ultra-wide operating ranges. With its integrated error amplifier and low dropout regulator, the TPS78405KTTR can maintain output voltage in a variety of conditions while providing efficient voltage regulation.

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