LTC3850IUF#PBF

Frequency - Switching:	250kHz ~ 780kHz
Base Part Number:	LTC3850
Supplier Device Package:	28-QFN (4x4)
Package / Case:	28-WFQFN Exposed Pad
Operating Temperature:	-40°C ~ 85°C (TA)
Control Features:	Current Limit, Enable, Frequency Control, Power Good, Soft Start, Tracking
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	Yes
Duty Cycle (Max):	97.2%
Series:	--
Voltage - Supply (Vcc/Vdd):	4 V ~ 30 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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LTC3850IUF#PBF Application Field and Working Principle

PMIC (Power Management IC) is a highly integrated chip designed to manage and control the power for integrated circuits. Voltage regulators and DC-DC switching controllers, which are one type of PMIC, are used in power conversion. The LTC3850IUF#PBF is a voltage regulator and DC-DC switching controller from Linear Technology, and it is usually used in embedded systems and high-end, low-voltage applications. In this article, the application field and working principle of the LTC3850IUF#PBF will be discussed.The LTC3850IUF#PBF is a high efficiency, low noise and flexible DC-DC switching controller that integrates low cost power inductors and other problems. It has a wide range of operating voltage, which is up to 14V, and it is suitable for applications such as industrial automation and medical systems. The LTC3850IUF#PBF also offers a wide array of programmable features such as peak current, peak voltage, and frequency. It has built in protection circuits and has the ability to regulate finely and precisely the output voltage.The LTC3850IUF#PBF has a synchronous buck mode and a linear regulator mode, which can be easily changed by the setting of a programming resistor. The synchronous buck mode is switched at the output of the current sense and is determined by the potential at the current sense input. When in synchronous buck mode, the output voltage is regulated based on the voltage feedback to the controller.In linear regulator mode, the current sense is switched at the low side of the output drive and the output voltage is regulated by the voltage feedback. In this mode, the output voltage is monitored and regulated by the error amplifier and the P SENSE feedback input. The LTC3850IUF#PBF also has a built-in system control logic (SCL) circuit, which consists of a low voltage detect and a load enable control block. The load enable control enables a better system performance and reduces the power consumption when the system is in idle mode.The LTC3850IUF#PBF has various capabilities that make it suitable for high-end, low-voltage applications. It is equipped with constant frequency synchronous PWM technology, which provides low noise operation and excellent system efficiency. The voltage mode regulation is also designed to allow for fast recovery in the event of overcurrent or overtemperature conditions. The SCL feature also further facilitates system performance by providing the ability to adjust the duty cycle.In conclusion, the LTC3850IUF#PBF is a suitable voltage regulator and DC-DC switching controller for embedded systems and high-end, low-voltage applications. It is equipped with features such as constant frequency synchronous PWM technology, programmable features, linear regulator mode and system control logic, which ensure its high efficiency, low noise operation and excellent system performance.

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