LTC3785IUF#TRPBF

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The LTC3785IUF#TRPBF is a volt-second mode Pulse Width Modulation DC/DC Switching Controller. It is part of the Power Management Integrated Circuit (PMIC) Voltage Regulators series. This switching controller focuses on synchronizing the output current and input voltage. Its high adjustable output current bounds the switching frequency. This allows the use of small inductors to reduce the size and increase efficiency by providing a regulated output voltage in a cost-effective manner.

Features

• Wide input voltage range: 4.5V to 60V
• Internal 400kHz oscillator
• Volt-second mode control for high-level load regulation
• Programmable undervoltage lockout
• Programmable input current limit
• Synthesized peak current-mode control
• Proportional voltage feedback loop
• Active current optimization

Applications

• Automotive, industrial and telecommunication applications
• High-current switch, resonant, and symmetrical buck converters
• Point-of-load converters
• Power loss reduction mechanisms
• Systems with fast transient response requirements
• Permanent magnet motor drives
• Solar and energy harvesting applications

Working Principle

The LTC3785IUF#TRPBF is controlled by an internal pulse width modulation (PWM) oscillator and implements a current-mode voltage regulation loop using Proportional Voltage Control (PVC).

The controller allows the designer to choose between independent, synchronized or constant on-time modes during operation. The output voltage is adjusted via an internal low-dropout linear regulator, and the voltage loop gain is programmable. A fast sensing amplifier is used to measure output current and peak control is implemented to improve transient response.

The input voltage can be monitored to set a low voltage lockout for the switching regulator. The input current can be limited via a configurable input current limit, and the over-voltage protection is a programmable feature for maximum safety. Furthermore, the controller utilizes an advanced thermal protection scheme to protect against overheating.

Summary

The LTC3785IUF#TRPBF is a compatible DC/DC switching controller from Power Management Integrated Circuits (PMIC). It uses features such as proportional voltage control and peak control to maximize efficiency and performance while minimizing power loss. It is usually used in automotive, industrial, and telecommunications applications and is suitable for high-current switch, resonant, and symmetrical buck converters, as well as point-of-load converters and permanent magnet motor drives.

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