LT8705AHFE#PBF Integrated Circuits (ICs)

Frequency - Switching:	100kHz ~ 400kHz
Base Part Number:	LT8705
Supplier Device Package:	38-TSSOP-EP
Package / Case:	38-TFSOP (0.173", 4.40mm Width), 31 Leads, Exposed Pad
Operating Temperature:	-40°C ~ 150°C
Control Features:	Enable, Frequency Control, Soft Start
Serial Interfaces:	--
Clock Sync:	Yes
Synchronous Rectifier:	Yes
Duty Cycle (Max):	--
Series:	--
Voltage - Supply (Vcc/Vdd):	2.8 V ~ 80 V
Output Phases:	2
Number of Outputs:	2
Topology:	Buck-Boost
Output Configuration:	Positive
Function:	Step-Up/Step-Down
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tube

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Introduction to LT8705AHFE#PBFThe LT8705AHFE#PBF is a high efficiency DC/DC switching regulator controller suitable for a wide variety of power conversion applications. It integrates a low on-resistance power MOSFET and a high current 4A gate drive into a common package, thus eliminating the need for two separate MOSFET and gate drive components. Its small packages size makes it suitable for applications that require high power density. The linear technology 8705AHFE#PBF is capable of providing up to 90% conversion efficiency, making it an ideal choice for applications such as portable and embedded systems, telecom and networking equipment, and industrial control systems. Application FieldsThe LT8705AHFE#PBF can be used for a wide range of power conversion applications. It is commonly used in portable and embedded systems that require the highest efficiency, such as cell phones and PDAs, as well as Telecom and network equipment which uses traditional switch mode power supplies. It is also used in a variety of industrial control systems, such as motor drives and microcontrollers. The LT8705AHFE#PBF is particularly suited for applications that require high power density and space-efficiencies, such as in medical devices and battery powered equipment. Working PrincipleThe LT8705AHFE#PBF is a Pulse width Modulation (PWM) controller that uses a buck topology (step-down). It has a built-in sense amplifier, an eRT logic circuit, an oscillator, a voltage divider and dead time generator, an overvoltage protection circuit, an undervoltage protection circuit, and a detected current control circuit. The sense amplifier senses the output voltage and adjusts the pulse width of its PWM according to the detected voltage. The oscillator frequency is typically adjustable, allowing for precise tuning of the switching regulator. The eRT logic circuit is used for increased efficiency when transitioning from low to high load conditions.The LT8705AHFE#PBF also has an overvoltage protection circuit which shuts off the power supply when the output voltage exceeds a set level, and an undervoltage protection circuit which shuts off the power supply when the input voltage drops below a certain level. The detected current control circuit ensures higher efficiency at higher output currents. Conclusion The LT8705AHFE#PBF is a high efficiency DC/DC switching regulator controller suitable for a wide range of power conversion applications. It integrates a low on-resistance power MOSFET and a high current 4A gate drive into a common package, thus eliminating the need for two separate MOSFET and gate drive components. Its small packages size makes it suitable for applications that require high power density. The LT8705AHFE#PBF is capable of providing up to 90% conversion efficiency and is an ideal choice for applications such as portable and embedded systems, telecom and networking equipment, and industrial control systems. The LT8705AHFE#PBF is a Pulse Width Modulation (PWM) controller that uses a buck topology (step-down) with integrated features such as a sense amplifier, eRT logic circuit, oscillator, voltage divider and dead time generator, over-voltage protection circuit, undervoltage protection circuit and a detected current control circuit.

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