LT1965IT-3.3#31PBF

Current - Output:	1.1A
Base Part Number:	LT1965
Supplier Device Package:	TO-220-5 Flow 31
Package / Case:	TO-220-5 Formed Leads
Mounting Type:	Through Hole
Operating Temperature:	-40°C ~ 125°C
Protection Features:	Over Current, Over Temperature, Reverse Polarity
Control Features:	Enable
PSRR:	75dB (120Hz)
Current - Supply (Max):	40mA
Current - Quiescent (Iq):	1.1mA
Series:	--
Voltage Dropout (Max):	0.49V @ 1.1A
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	3.3V
Voltage - Input (Max):	20V
Number of Regulators:	1
Output Type:	Fixed
Output Configuration:	Positive
Part Status:	Active
Packaging:	Tube

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Introduction

The LT1965IT-3.3#31PBF is a low noise, low dropout, linear voltage regulator. It is suitable for applications requiring very low noise and wide transient response, such as powering RF systems. This device has an adjustable output current of up to 150mA, fixed output voltage of 3.3V, and a very low output voltage noise of 45μVrms. The LT1965IT-3.3#31PBF is available in the two leaded Micro8 and SOT-223 packages.

Application Field

The LT1965IT-3.3#31PBF is particularly suitable for RF applications such as cell phones and other wireless systems, because of its low noise and wide transient response. It is also useful in any device or system requiring a very stable power supply with very low noise, as well as in portable battery powered systems.

Features

The LT1965IT-3.3#31PBF features a low dropout voltage of 160mV at full load, fast transient response time of 5μs, over current and overtemperature protection, and thermal shutdown protection. The output voltage is adjustable between 1.5V and VOUT (with the device\'s reference voltage). Its low quiescent current of 12mA makes it an ideal choice for battery-powered applications.

Working Principle

The LT1965IT-3.3#31PBF operates on a two-stage principle. The first stage is a low dropout linear regulator, in which an external resistor is used to set the output voltage. The second stage is a high gain error amplifier, which compensates for output voltage variations caused by changes in load current, input voltage, and temperature.The device\'s internal circuitry ensures stable operation even when transient loads are applied. It can also prevent output voltage overshoot and prevents thermal shutdown even during peak load conditions. The high-gain error amplifier also helps to minimize output voltage noise and improves stability of the overall voltage regulation circuit.

Conclusion

The LT1965IT-3.3#31PBF is an ideal low noise, low dropout linear voltage regulator for RF applications such as cellular phones and other wireless systems. Its adjustable output current of up to 150mA and low quiescent current make it ideal for battery powered applications as well. The LT1965IT-3.3#31PBF is available in the two leaded Micro8 and SOT-223 packages, making it suitable for a wide range of applications.

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