LT3640IUFD#TRPBF

Synchronous Rectifier:	No
Operating Temperature:	-40°C ~ 125°C (TJ)
Mounting Type:	Surface Mount
Package / Case:	28-WFQFN Exposed Pad
Supplier Device Package:	28-QFN (4x5)
Base Part Number:	LT3640
Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Active
Function:	Step-Down
Output Configuration:	Positive
Topology:	Buck
Output Type:	Adjustable
Number of Outputs:	2
Voltage - Input (Min):	2.5V
Voltage - Input (Max):	35V
Voltage - Output (Min/Fixed):	0.6V, 1.265V
Voltage - Output (Max):	33.97V
Current - Output:	1.1A, 1.3A
Frequency - Switching:	500kHz ~ 2MHz

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LT3640IUFD#TRPBF Application Field and Working Principle

Introduction:

LT3640IUFD#TRPBF is a DC-DC buck switching voltage regulator integrated circuit. It belongs to the category of PMIC - Voltage Regulators - DC DC Switching Regulators. The integrated circuit is built using advanced 0.35μm CMOS technology and its PINs are lead-free and RoHS compliant. Its operating temperature range is of -40°C to 125°C and its minimum input voltage is 4V while its maximum input voltage can reach up to 25V.

Application Field:

Due to its broad input voltage range, the LT3640IUFD#TRPBF integrated circuit can be used for a variety of applications. The main ones are related to portable systems and consumer electronics, medical, industrial and automotive systems. Some of its main applications are listed as follows:

• Microprocessor and microcontroller systems
• Battery-powered systems with low quiescent current
• On-board DC-DC converters
• Supply voltage tracking circuits
• High-efficiency ripple-free output voltage tracking

Working Principle:

The working principle of the LT3640IUFD#TRPBF integrated circuit is based on the buck DC-DC converter topology. The voltage regulator circuit comprises of two main parts: the high-side switch and the low-side switch. The high-side switch is in the form of an N-channel MOSFET and the low-side switch consists of a P-channel MOSFET. The N-channel MOSFET is used to control the input voltage while the P-channel MOSFET controls the output voltage.The high-side switch is used to control the input voltage from the battery or other power source. The low-side switch then switches between the input voltage and the output voltage in order to regulate the output voltage. This is done by comparing the output voltage to the reference voltage and adjusting the current that flows through the switches in order to provide a regulated output voltage. The switches are also synchronized so that the low-side switch turns off when the high-side switch turns on and vice versa.

Conclusion:

In conclusion, the LT3640IUFD#TRPBF integrated circuit is a DC-DC buck switching voltage regulator which is suitable for a variety of applications including microprocessor and microcontroller systems, battery-powered systems and on-board switching converters. It is based on the buck DC-DC converter topology and comprises of an N-channel MOSFET for controlling the input voltage and a P-channel MOSFET for controlling the output voltage. The switches are synchronized so that the low-side switch turns off when the high-side switch turns on and vice versa, resulting in a regulated output voltage.

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