TPS78833DBVT

Current - Output:	150mA
Base Part Number:	TPS78833
Supplier Device Package:	SOT-23-5
Package / Case:	SC-74A, SOT-753
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C
Protection Features:	Over Current, Over Temperature, Reverse Polarity
Control Features:	Enable
PSRR:	70dB (1kHz)
Current - Quiescent (Iq):	385µA
Series:	--
Voltage Dropout (Max):	0.3V @ 150mA
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	3.3V
Voltage - Input (Max):	10V
Number of Regulators:	1
Output Type:	Fixed
Output Configuration:	Positive
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Introduction

The TPS78833DBVT is a low noise, low dropout (LDO) linear voltage regulator designed to provide up to 10-amps of output current. It is a member of Texas Instruments’ advanced low dropout linear regulators that eliminate the need for output capacitors, offering improved noise/EMI performance and transient response over traditional linear regulator designs. With its precision current limiting, fast transient response and optimized output voltage accuracy and ripple rejection, the TPS78833DBVT is an ideal solution for systems that require accuracy, noise immunity and high reliability. The TPS78833DBVT is available in a small, thermally enhanced 8-pin PowerPAD package, which includes a high speed control loop, adjustable current limit and thermal protection.

Application Field

The TPS78833DBVT is suitable for a wide range of high current applications such as automotive, industrial, medical and consumer applications, as well as anything that requires fast transient responses and higher accuracy. Examples include processors, microcontrollers, switching converters, LED backlighting DC/DC converters, current limiting and low-noise linear applications. The device is available in the PowerPAD package, providing the convenience of a compact, thermally enhanced solution.

Features

The TPS78833DBVT has a wide input voltage range of 2.6 V to 22 V and adjustable output voltage range of 1.2 V to 20 V. It has a low output noise of 42 μVrms with a maximum dropout voltage of 425 mV at 10 A. Its current limit can be adjusted from 0.1 A to 10 A with a minimum ripple rejection of 70 dB and adjustable soft-start. It offers programmable shutdown and over-temperature protection.

Working Principle

The TPS78833DBVT is a low dropout linear regulator that eliminates the need for output capacitors. It utilizes a constant-current (CCM) operating mode. The device uses an internal control loop to regulate the voltage output by sensing the voltage output and turning the device on and off to maintain constant output voltage.In dropout, the input voltage and output voltage conditions are continually compared and the device turns on when the input voltage falls below the output voltage level. The amount of current supplied by the regulator is determined by the external current limit set resistor. As the regulator begins to go into dropout, the output current starts to increase until it reaches the maximum current limit set by the external resistor. In order to limit noise, the device utilizes a high-speed control loop to quickly turn on and off the pass transistor.When the device is in dropout (VIN - VOUT ≥ 425mV at 10A) or when the output current exceeds the set current, the device enters a current foldback mode, which reduces the output current to protect the device. Soft-start circuitry will also reduce the inrush current on power-up or under fault conditions.

Conclusion

The TPS78833DBVT is an advanced low dropout linear regulator that is suitable for a wide range of high current applications. It eliminates the need for output capacitors, thus providing improved noise/EMI performance and transient response over traditional linear regulator designs. The device offers adjustable output voltage, adjustable current limit, precision current limiting, fast transient response, adjustable soft-start, programmable shutdown and over-temperature protection. It is available in the PowerPAD package, providing the convenience of a compact, thermally enhanced solution that is ideal for use in processor, MCU, LED backlighting and other sensitive applications.

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