LTC3805EMSE-5#PBF

Frequency - Switching:	70kHz ~ 700kHz
Base Part Number:	LTC3805
Supplier Device Package:	10-MSOP-EP
Package / Case:	10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
Operating Temperature:	-40°C ~ 85°C (TA)
Control Features:	Enable, Soft Start
Serial Interfaces:	--
Clock Sync:	Yes
Synchronous Rectifier:	No
Duty Cycle (Max):	80%
Series:	--
Voltage - Supply (Vcc/Vdd):	3.95 V ~ 9.5 V
Output Phases:	1
Number of Outputs:	1
Topology:	Boost, Flyback, SEPIC
Output Configuration:	Positive, Isolation Capable
Function:	Step-Up, Step-Up/Step-Down
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tube

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IntroductionThe LTC3805EMSE-5#PBF, an integrated circuit from Linear Technology, is a high efficiency, wide input voltage range, high-current DC/DC switching controller. It offers users a best-in-class solution to their power supply design needs. This device is ideal for a variety of high-efficiency, high-current switching power supplies for consumer, industrial and computing applications.FeaturesThe LTC3805EMSE-5#PBF includes several key features. Some of these include: - Wide Input Voltage Range: The device supports input voltage ranging from 3.2 V to 24 V, making it ideal for systems that require a wide range of voltages.- High-Efficiency: The device offers improved efficiency over similar devices, with an efficiency of up to 95%.- Soft-Start Control: The device includes soft-start control to minimize output ripple.- Programmable Oscillator Frequency: The device features an internal oscillator which can be programmed to generate the desired switching frequency.- Pulse-Skipping Mode: The device supports pulse-skipping mode to reduce input current ripple.- Short-to-Ground Protection: The device includes protection for output shorts to ground.Application FieldsThe LTC3805EMSE-5#PBF is ideal for many high-efficiency, high-current switching power supply designs. Some of the most common applications in which the device is used include: - DC/DC Converters: The device is suitable for use in DC-DC converters that require efficient, high-current power supply solutions.- LEDs: The device can be used in LED lighting systems that require high-efficiency, high-current switching power supplies.- Battery Chargers: The device is suitable for use in battery charging systems that require high-efficiency, high-current switching power supplies.- Telecommunications: The device can be used in a variety of power supply solutions for telecommunications equipment.- Computers: The device is suitable for use in power supply solutions for computers and other electronic equipment.Working PrincipleThe LTC3805EMSE-5#PBF is a high-efficiency, high-current DC/DC switching controller that uses a Pulse Width Modulation (PWM) technique to generate the desired output voltage. This device works by rapidly switching an output stage device (typically an N-channel power MOSFET) at a fixed frequency. The duty cycle of the switch is used to control the output voltage, with a high duty cycle producing a high output voltage, and a low duty cycle producing a low output voltage. Additionally, an internal oscillator is used to generate the switching frequency, which can be scaled to suit the application.The device also features a number of safety features, such as current limiting and short-to-ground protection, to help protect the user from any potential damage or malfunctioning. Finally, the device also includes soft-start control to minimize output ripple, and pulse-skipping mode to reduce input current ripple.ConclusionThe LTC3805EMSE-5#PBF from Linear Technology is a high-efficiency, wide input voltage range, high-current DC/DC switching controller that is ideal for a variety of power supply design needs. The device offers a wide input voltage range, as well as high-efficiency, with up to 95% efficiency. It also includes features such as soft-start control, pulse-skipping mode, and short-to-ground protection. The LTC3805EMSE-5#PBF is suitable for use in a variety of high-efficiency, high-current switching power supplies, such as DC/DC converters, LED lighting systems, battery chargers, telecommunications equipment, and computers.

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