LTC3785IUF#PBF

Introduction

The LTC3785IUF#PBF is a monolithic high power, synchronous step down switching controller that delivers up to 8 A of output current from an input voltage of 6 V to 33 V. This device is an ideal choice for supplying high current, bus powered systems such as notebook computers, set-top boxes, automotive applications, telecom and industrial systems, and hard disk drives. The device features adjustable peak current limit, fixed frequency operation and a power save mode with internal synchronous rectification and low quiescent current.

Applications

The LTC3785IUF#PBF is designed to support a wide range of applications with flexibility, reliability and cost effectiveness. The device is well suited for dc-to-dc conversion applications such as notebook and portable computers, hard disk drives, telecom, industrial and automotive applications. The device supports adjustable peak current-limit protection, fixed frequency operation and a power-save mode for improved power efficiency.

With its versatile features, the LTC3785IUF#PBF can be used in a wide variety of applications, such as: Notebook, Desktop and Server PSUs, DC-DC (bus) converters, Point of Load Regulators, Set-Top Boxes, Automotive applications, Telecom and Industrial Systems, Hard Disk Drives and Battery Chargers.

Working Principle

The LTC3785IUF#PBF is a high frequency, synchronous, step-down DC-DC switching controller. It operates in two modes – Inrush- Mode and Power-Save Mode. In Inrush Mode, the device senses the input voltage, sets the switching frequency and enters into a pulse width modulation (PWM) mode to provide an adjustable DC voltage output. The device can transition from Inrush Mode to Power-Save mode if the output voltage decreases below the threshold limit or if the input voltage is lower than the VINL_OF pin voltage. In Power-Save mode, the device shuts off the clock, waits for a stable input voltage and restarts the switching process.

The LTC3785IUF#PBF supports adjustable peak current limit, output voltage tracking and adjustable slew rate control. It also features integrated reference voltage and clock circuit. The internal power-save mode combined with low quiescent current makes it an excellent choice for applications that require high efficiency and low system cost.

Conclusion

The LTC3785IUF#PBF is a high power, synchronous step down switching controller designed to supply up to 8A of output current from an input voltage of 6V to 33V. The device is suitable for a wide range of applications with flexibility, reliability and cost effectiveness. It supports adjustable peak current-limit protection, fixed frequency operation and a power-save mode for improved power efficiency. The device is also well suited for dc-to-dc conversion applications such as notebook and portable computer, hard disk drives, telecom, industrial and automotive applications.