Description
FR9809 is a high-efficiency synchronous step-down
DC/DC converter that employs a special process
technique to obtain very low R
DS
(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
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.
This high-efficiency current mode step-down “Green
Power Converter” offers the standard SOP-8
package with an exposed pad.
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
Applications
Networking Equipment
OLPC, Netbook
Distributed Power System
LCD Monitor, TV, STB
External HDD
Security System
PW代理商：深圳市夸克微科技
郑生： 13528458039
QQ ： 2867714804
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