LT3023IMSE#TRPBF

Voltage Dropout (Max):	0.45V @ 100mA, 0.45V @ 100mA
Base Part Number:	LT3023
Supplier Device Package:	10-MSOP-EP
Package / Case:	10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C
Protection Features:	Over Current, Over Temperature, Reverse Polarity
Control Features:	Enable
PSRR:	65dB (120Hz)
Current - Output:	100mA, 100mA
Series:	--
Voltage - Output (Max):	20V
Voltage - Output (Min/Fixed):	1.22V
Voltage - Input (Max):	20V
Number of Regulators:	2
Output Type:	Adjustable
Output Configuration:	Positive
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Introduction

LT3023IMSE#TRPBF is a positive and negative voltage regulator featuring both low output voltage noise and excellent line and load regulation performance. This power SOT-23B chip is designed for applications in ultra-low voltage, low-noise rail-to-rail power supplies. LT3023IMSE#TRPBF is classified as a PMIC (Power Management IC), particularly as a Voltage Regulator under the Linear section. In this paper, the application field and working principle of LT3023IMSE#TRPBF will be described.

Applications

LT3023IMSE#TRPBF is widely used in many applications requiring a low-noise rail-to-rail power supply. Some of the common usage includes providing precise and clean power rails to low noise and high accuracy ADC circuits, buffering of precise low reference voltages, as low noise voltage references in precision instrumentation and amplifiers, powering PLL/timing and RF circuits, and much more. In short, LT3023IMSE#TRPBF is used in applications when precision and clean power supplies are needed.

Features

LT3023IMSE#TRPBF has many features that make it an attractive device for a vast range of applications. First and foremost, it is capable of both negative and positive linear regulation over a wide input voltage range (the range is in between 1.2V to 25V). This makes it suitable for applications requiring both power supplies. In addition, it has low dropout operation of only 200mV, and can provide up to 200mA of current over the same operable voltage range. This makes a steady and stable output even at low input voltages, which is important for applications requiring a constant voltage output. Furthermore, the device\'s low noise output is only 10µV ( RMS), making it ideal for sensitive applications where a clean power supply is needed. Lastly, it has excellent line and load regulation performance of ±0.5% and ±5mV, respectively, as well as very low temperature coefficient (only 30ppm/°C). All these features are important in meeting the stringent requirements of many demanding applications.

Working Principle

The working principle of LT3023IMSE#TRPBF is simple and based on the three-terminal linear regulator topology. It largely functions the same as other linear regulators, but with added features such as low noise and high accuracy. First, the voltage (Vin) is regulated with a bandgap reference, and compared to an external reference voltage (Vref) via an error amplifier. The error voltage between Vin and Vref is then used to control the external pass element (MOSFET transistor, typically) which blocks the current from flowing from the input to the output terminal. This will effectively regulate the output voltage (Vout) to a fixed value above or below Vref. The output voltage is determined by the value of the external reference voltage (Vref) and the load current (Iload). As the load current increases, the output voltage will drop due to the MOSFET pass element\'s internal resistance creating a voltage drop. To compensate for this, LT3023IMSE#TRPBF has a built-in error amplifier that increases the error voltage between Vref and Vin in order to increase the MOSFET pass element\'s conduction and restore the output voltage to its original value. This efficient circuit provides an accurate and stable output voltage.

Conclusion

The LT3023IMSE#TRPBF is a positive and negative voltage regulator with excellent line and load regulation performance, and low output noise. With its capability to provide both positive and negative rail-to-rail power, low dropout operation, 200mA of current output, low noise output of only 10µV, and excellent line and load regulation performance, this device is suitable for many applications requiring a precise, clean and stable voltage output. Its working principle is based on the three-terminal linear regulator topology, where an error amplifier is used to compare the regulated voltage to the external reference and control the pass element. Overall, the LT3023IMSE#TRPBF is a versatile and efficient device suitable for most power management tasks.

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