TMI3257数据手册Tollsemi中文资料规格书

描述 Description

The TMI3257 is a high efficiency 800kHz current mode constant on-time (CM-COT) control mode synchronous step-down DC-DC converter capable of delivering 2A current. TMI3257 integrates main switch and synchronous switch with very low RDS(ON) to minimize the conduction loss. Low output voltage ripple and small external inductor and capacitor size are achieved with 800kHz switching frequency. It adopts the CM-COT architecture to achieve fast transient responses for high voltage step down applications.The TMI3257 requires a minimum number of readily available standard external components and is available in a space saving 6-pin SOT563 ROHS compliant package.

特性 Features

. High Efficiency: Up to 93%(@3.3V)(2). 800kHz Frequency Operation(2). Up to 2.0A Output Current(2). Low RDS(ON)for internal switches:90mΩ/45mΩ(top/bottom)(2). 4.5V to 18V Input Voltage Range(2). 0.807V Reference(2). Current mode COT control to achieve fast transient responses(2). Integrated internal compensation(2). Stable with Low ESR Ceramic Output Capacitors(2). Over Current Protection with Hiccup Mode(2). Thermal Shutdown(2). Inrush Current Limit and Soft Start(2). Available in SOT563Package(2)

应用 Application

. Digital Set Top Boxes
. Flat Panel Television and Monitors
. Notebook computer
. Wireless and DSL Modems