FR9808中文资料Buck DC-DC 数据手册Fitipower规格书

描述 Description

FR9808 is a high-efficiency synchronous step-down DC/DC converter that employs a special process technique to obtain very low RDS(ON) for the internal metal–oxide–semiconductor field-effect transistor (MOSFET). The input operation voltage is in a wide 4.75V to 21V, and continuous load current capability is 4A. Control circuit is designed by a particular current mode which provides fast transient response and eases loop stabilization. This product has a very low standby current less than 1μA in shutdown mode. When the EN/SYNC pin voltage is less than 0.4V, FR9808 will turn off. Fault protection includes over current protection (OCP), under voltage lockout protection (UVLO) and over temperature protection (OTP) function. This high-efficiency current mode step-down “Green Power Converter” offers the standard SOP-8 package with an exposed pad.

特性 Features

● High Efficiency up to 90%
● Internal MOSFET RDS(ON): 120mΩ/20mΩ
● Internal Compensation
● Input Operation Voltage Range: 4.75V to 21V
● 4A Continuous Output Current
● Output Voltage down to 0.805V
● 500KHz Oscillation Frequency
● Sync to External Clock from 300 KHz to 800 KHz
● Cycle-by-Cycle Current Limit
● Under Voltage Lockout
● Over-Temperature Protection with Auto Recovery
● <1μA Shutdown Current
● Thermal Enhanced SOP-8 (Exposed Pad) Package
● RoHS Compliant

应用 Application

● Networking equipment
● OLPC, Netbook
● Distributed power system
● LCD monitor, TV, STB
● External HDD
● Security System