LT1764ET#31PBF

Series:	--
Packaging:	Tube
Part Status:	Active
Output Configuration:	Positive
Output Type:	Adjustable
Number of Regulators:	1
Voltage - Input (Max):	20V
Voltage - Output (Min/Fixed):	1.21V
Voltage - Output (Max):	20V
Voltage Dropout (Max):	0.45V @ 3A
Current - Output:	3A
Current - Quiescent (Iq):	5mA
Current - Supply (Max):	200mA
PSRR:	63dB (120Hz)
Control Features:	Enable
Protection Features:	Over Current, Over Temperature, Reverse Polarity
Operating Temperature:	-40°C ~ 125°C
Mounting Type:	Through Hole
Package / Case:	TO-220-5 Formed Leads
Supplier Device Package:	TO-220-5 Flow 31
Base Part Number:	LT1764

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LT1764ET#31PBF Application Field and Working Principle

Introduction

LT1764ET#31PBF is one of the linear voltage regulators falling into the PMIC (Power Management ICs) category. This voltage regulator paves the way for designers to meet the power circuits needs. It controls the DC/DC converters, provides a low-noise linear power supply and ensures proper regulating while consuming extremely low standby power.

Features

The LT1764ET#31PBF by Linear Technology is a high performance low dropout 3A buck regulator. It is available in TO-263 5-Leads and in industry standard 8-Leads packages. It is able to control input voltage range from 4.5V to 18V, allowing for effecient low power operation for continuous output currents up to 3A.On top of that, the robust internal circuit of this voltage regulator achieves a low dropout voltage (at 680 mV), low quiescent current (at 200μA) and great load regulation (at ±0.4%). Moreover, it is provided with a high-side current limiting circuit, allowing the device protection from overloads.

Application

The LT1764ET#31PBF is widely used in cellular phones, PDAs and other portable devices. It is also used in desktop and server systems, in high current consumer products such as TVs and audio amplifiers, as well as in aerospace and military systems.

Working Principle

Linear voltage regulators provide a controlled current or voltage output. The output voltage is maintained at a constant level, even during a change in input or load current, by comparing the output of a voltage reference to the current level.The LT1764ET#31PBF contains a voltage reference,, an error amplifier, and a shunt FET (Field Effect Transistor) inside the chip. In general, the regulator operates by maintaining a small voltage drop between the input voltage and output voltage, which is known as ‘Dropout Voltage’.The error amplifier of the voltage regulator senses when the output voltage drops below the reference voltage. This triggers the shunt FET to be switched on and current is pulled from the input supply to maintain the output voltage. The purpose of this voltage regulator is to ensure that the output voltage remains as close as possible to the reference voltage and allow very small dropout voltage.

Conclusion

The LT1764ET#31PBF is an excellent linear voltage regulator from Linear Technology. It provides a high performance low dropout 3A buck regulator, allowing for effecient low power operation for continuous output currents up to 3A and providing robust internal circuit for a low dropout voltage and low quiescent current. With its wide array of applications such as cellular phones, PDAs and other portable devices, desktop and server systems, as well as aerospace and military systems, the LT1764ET#31PBF voltage regulator is an incredibly versatile and powerful product.

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