LTC3785EUF-1#TRPBF

Frequency - Switching:	100kHz ~ 1MHz
Base Part Number:	LTC3785
Supplier Device Package:	24-QFN (4x4)
Package / Case:	24-WFQFN Exposed Pad
Operating Temperature:	-40°C ~ 85°C (TA)
Control Features:	Current Limit, Enable, Soft Start
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	Yes
Duty Cycle (Max):	99%
Series:	--
Voltage - Supply (Vcc/Vdd):	2.7 V ~ 10 V
Output Phases:	1
Number of Outputs:	2
Topology:	Buck-Boost
Output Configuration:	Positive
Function:	Step-Up/Step-Down
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tape & Reel (TR)

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LTC3785EUF-1#TRPBF Application Field and Working PrincipleThe LTC3785EUF-1#TRPBF is a DC/DC switching controller from Linear Technology’s PMIC (Power Management ICs) family of products. The switching controller is used to control the output voltage of a DC/DC converter to meet application demands. It is widely used across a range of applications such as communication systems, personal computers, automotive, and consumer electronics.The LTC3785EUF-1#TRPBF is designed to operate from a current-mode control loop with an input voltage range from 4.5V to 28V and an output voltage range from 0.8V to 28V. It is capable of providing up to 6A continuous output current in either jump start or cycle-by-cycle current limit modes. It supports a wide range of PWM frequencies from 300kHz up to 1MHz. It also supports forced continuous conduction mode (FCCM) and constant on-time mode (COT).The LTC3785EUF-1#TRPBF offers superior performance and reliability by incorporating a near-zero deadtime synchronous current mode control. Its features include input under voltage lockout, frequency foldback, non-saturating drives and accurate current sense amplification. Other features include wide peak current limit range, error amplifier over-voltage, under-voltage and short-circuit protection, and user-programmable loop compensation.The LTC3785EUF-1#TRPBF can provide stable and reliable output voltage regulation over a wide operating temperature range, even under harsh operating conditions. It is available in SOT-23 and TO-263 packages, making it ideal for a wide range of applications.Working Principle:The LTC3785EUF-1#TRPBF provides a fast, accurate, and reliable voltage regulation solution. It works by using a near-zero deadtime synchronous current mode control loop.The LTC3785EUF-1#TRPBF internally monitors the output voltage, and compares it with a reference voltage set by the external feedback resistors. The error signal is then converted to a current, which is compared with the output current. This comparison forms the current mode control loop and is fundamental in controlling the output voltage.The error current is then integrated with a switching current to generate a control voltage, which is compared with the ramp voltage to generate a PWM signal to control the output.The LTC3785EUF-1#TRPBF also features a current-sense amplifier that converts the output current to a voltage to provide a comparison signal for the current mode control loop.The switching frequency can also be adjusted using a resistive divider circuit, allowing for further customization of the output voltage.In addition, the LTC3785EUF-1#TRPBF is equipped with a wide range of protection features, such as input under voltage lockout, thermal shutdowns, error amplifier over-voltage and under-voltage protection, and short-circuit protection.Overall, the LTC3785EUF-1#TRPBF is a reliable and efficient way of controlling the output voltage of a DC/DC converter. It provides good performance and stability over a wide range of operating conditions and temperature ranges. In addition, it reduces components count and cost, as well as design complexity.

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