LTC1709EG#PBF

Frequency - Switching:	140kHz ~ 310kHz
Base Part Number:	LTC1709
Supplier Device Package:	36-SSOP
Package / Case:	36-SSOP (0.209", 5.30mm Width)
Operating Temperature:	-40°C ~ 85°C (TA)
Control Features:	Enable, Soft Start
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	Yes
Duty Cycle (Max):	99.5%
Series:	--
Voltage - Supply (Vcc/Vdd):	4 V ~ 36 V
Output Phases:	2
Number of Outputs:	2
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tube

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LTC1709EG#PBF Application Field and Working Principle

The LTC1709EG#PBF is a fixed frequency DC/DC controller designed for use with synchronous buck regulators. It can provide the most efficient means to reduce the high voltage supplied by batteries, transformer rectifiers, or other high voltage sources, to the lower voltages necessary to run end system components. This type of controller is called a DC/DC switching controller and is categorized as a voltage regulator because its purpose is to regulate the output voltage.When a switching controller is used to power a synchronous buck regulator, it is necessary to efficiently and accurately transfer energy from a high voltage source to a low voltage load. In order to accomplish this task, the controller must accurately adjust the duty cycle of the switch, or switches, that it is controlling in order to produce the desired output voltage. This type of controller is equipped with a variety of features to ensure that the adjustment of the duty cycle is done accurately and efficiently.The LTC1709EG#PBF is a fixed frequency DC/DC controller designed to control the duty cycle of a synchronous buck regulator. This controller is capable of providing up to 12A of output current and switching at frequencies up to 1.5MHz. It features an adjustable shutdown current limit, output over-voltage protection, and adjustable soft-start. It also has a variety of built-in diagnostics such as: thermal shutdown, over-voltage and over-current detection, and input under-voltage lockout.When the LTC1709EG#PBF is used to power a synchronous buck regulator, it is necessary to accurately adjust the duty cycle of the switch, or switches, that it is controlling in order to produce the desired output voltage. In this application, the LTC1709EG#PBF utilizes a fixed frequency control scheme to achieve the desired output voltage. This type of control scheme is best suited for high current applications, as it is inherently efficient and the output voltage is accurate and stable over line, load, and temperature variations. When using the fixed frequency scheme, the controller will monitor both the output voltage feedback and the synchronous buck signal. If there is a discrepancy between these signals, the controller will adjust the duty cycle of the switch or switches in order to bring the output voltage back to the desired level. This is accomplished by comparing the output voltage feedback to an internal reference voltage. When an offset is detected, the controller will adjust the duty cycle of the switch or switches so that the output voltage approaches the desired level.The LTC1709EG#PBF is a highly efficient switching controller designed for use in applications requiring regulated voltage outputs. This type of controller is ideal for battery operated devices, portable devices, and other applications that require efficient, accurate output voltage regulation. Its adjustable current limit, output over-voltage protection, and adjustable soft-start make it a good choice for applications requiring reliable, predictable performance. It can also be used in applications requiring robust diagnostics and fault protection.

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