LTC3851AEMSE#TRPBF

Frequency - Switching:	235kHz ~ 750kHz
Base Part Number:	LTC3851
Supplier Device Package:	16-MSOP-EP
Package / Case:	16-TFSOP (0.118", 3.00mm Width) Exposed Pad
Operating Temperature:	-40°C ~ 125°C (TJ)
Control Features:	Current Limit, Enable, Frequency Control, Soft Start, Tracking
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	Yes
Duty Cycle (Max):	99%
Series:	--
Voltage - Supply (Vcc/Vdd):	4 V ~ 38 V
Output Phases:	1
Number of Outputs:	1
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Application Field and Working Principle of LTC3851AEMSE#TRPBF

The LTC3851AEMSE#TRPBF is a type of programmable, synchronous, low-side current-mode switching controller which is used to provide voltage regulating and current limiting control of DC-DC converters. It is classified as a set of PMIC-Voltage Regulators-DC DC Switching Controllers, which includes a range of controllers, regulators, and power management integrated circuits. It is designed to efficiently regulate the output voltage of a step-down DC-DC converter and is capable of handling currents up to 6A. The LTC3851AEMSE#TRPBF provides superior noise performance, fast transient response and quick compensation settling, making it suitable for a range of applications such as low-noise synchronous converters, portable products, digital telecommunications, avionics, industrial systems and personal computers.The LTC3851AEMSE#TRPBF features a unique temperature compensated soft-start function to reduce output in rush current and to provide overvoltage protection. The device also offers advanced control features such as an adjustableCurrent-Mode Control frequency (CCMF), slope compensation which is adjustable via an external resistor, and it also features a logic-level feedback voltage (VFB) regulator which is capable of controlling an array of topologies including flyback, forward, buck, and buck-boost.The working principle of the LTC3851AEMSE#TRPBF is quite simple. It provides a regulatedoutput voltage of up to 65V, by sensing the input voltage, loading conditions and temperature fluctuations. It then adjusts the switching frequency to maintain a constant output voltage.The major components of the LTC3851AEMSE#TRPBF are the comparator, voltage reference, oscillator, power switch and current sensing isolation circuit. The comparator senses the voltage at the output and compares it with the reference voltage. The reference voltage is adjustable for fine tuning, and the oscillator sets the switching frequency. The power switch is a low-side transistor, and the current sensing isolation circuit is a transformer which is used to transform any changes to the sense resistor into a current signal.The basic operation of the LTC3851AEMSE#TRPBF is simple. When the voltage on the feedback voltage terminal exceeds the reference voltage, the comparator transitions, the power switch is turned off, the inductor current discharges, the feedback voltage falls below the reference voltage and then the device turns on the power switch to charge the inductor. This cycle is continued and the output voltage is clamped to the reference voltage.In summary, the LTC3851AEMSE#TRPBF is a type of programmable, synchronous, low-side current-mode switching controller, designed to provide voltage regualting and current limiting control of DC-DC converters. The device is capable of handling currents up to 6A, and is suitable for a range of applications such as low-noise synchronous converters, portable products, digital telecommunications, avionics, industrial systems and personal computers. It provides advanced control features, and its working principle is based on the comparator, voltage reference, oscillator, power switch and current sensing isolation circuit.

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