LTC3809EMSE#TRPBF

Introduction

LTC3809EMSE#TRPBF is a partially integrated dc-dc switching controller integrated circuit designed specifically for the high current, wide input voltage range power supply applications such as Voltage Regulation Module (VRM) and DC/DC converters. It contains the necessary functions for a robust, compact design, such as dual switched current (SC) loops with individually programmable current limit and external sense voltage, programmable feedback voltage, system power good signal, and power save mode.

Application Field

LTC3809EMSE#TRPBF provides high power efficiency and high power density. It also features a wide input voltage range (7V to 24V), low-noise operation, and a wide variety of protection features. It is suitable for applications such as computers, servers, industrial Ethernet networks, wireless communication systems, and so on. It is also suitable for notebook computers and desktop computers, graphics card and CPU cooling fan, peripheral equipment such as printers, scanners, and hard disks.

Working Principle

The LTC3809EMSE#TRPBF’s working principle is to use a pair of discrete synchronous rectifier MOSFETs to control the current flow, in a fixed frequency PWM mode, and then transform into a desired output voltage. The dual SC loops in the LTC3809EMSE#TRPBF can sense the currents of both MOSFETs with external sense resistors and limit their current and keep them working in their linear region. The LTC3809EMSE#TRPBF features programmable overcurrent protection that set the level of current that flows through each MOSFET, which works as a system fault protection. The flexible frequency control scheme allows the operation frequency of the LTC3809EMSE#TRPBF to be adjusted for different types of output voltages. The LTC3809EMSE#TRPBF also has an adjustable advanced current-regulation compensation algorithm to improve the transient response and line regulation of the system.

Conclusion

The LTC3809EMSE#TRPBF is a high-performance power switching controller IC, with a wide input voltage range (7V to 24V), high power efficiency, high power density, low-noise operation, and multiple safety features. It is ideal for systems such as computers, servers, industrial Ethernet networks, and wireless communication. It can be used for notebook/desktop computers, graphics card and CPU cooling fans, and various peripherals, such as printers, scanners, and hard disks.