FR9809 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 range from 4.75V to 21V, and continuous load current capability is 5A. 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 SHDN/S pin voltage is less than 0.4V, FR9809 will turn off. Fault protection includes over current protection (OCP), under voltage lockout protection (UVLO) and over temperature protection (OTP) function.
T his high-efficiency current mode step-down “Green Power Converter” offers the standard SOP-8 package with an exposed pad.
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Features High Efficiency up to 90% Internal MOSFET R DS (ON): 110mΩ 20mΩ Internal Compensation Input Operation Voltage Range: 4.75V to 21V 5A Continuous Output Current Output Voltage down to 0.805V 500KHz Oscillation Frequency Sync to External Clock from 300KHz to 800KHz 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 |
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Applications Networking Equipment OLPC, Netbook Distributed Power System LCD Monitor, TV, STB External HDD Security System
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