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FR9889

 
Description

The FR9889 is a synchronous step-down DC/DC converter that provides wide 4.5V to 23V input voltage range and 3A continuous load current capability. At light load condition, the FR9889 can operate at power saving mode to support high efficiency and reduce power lose.

The FR9889 fault protection includes cycle-by-cycle current limit, UVLO, output overvoltage protection and thermal shutdown. The soft-start function prevents inrush current at turn-on. This device uses current mode control scheme which provides fast transient response. Internal compensation function reduces external compensation components and simplifies the design process. In shutdown mode, the supply current is about 1μA.

The FR9889 is available in a SOP-8 exposed pad package, which provides good thermal conductance.

 
Features

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● Low RDS(ON) Integrated Power MOSFET (120mΩ /100mΩ)
● Internal Compensation Function
● Internal Power Good Function
● Wide Input Voltage Range: 4.5V to 23V
● Adjustable Output Voltage Down to 0.925V
● 3A Output Current
● 340kHz Switching Frequency
● External Programmable Soft-Start or Internal 600μs Soft-Start
● Cycle-by-Cycle Current Limit
● Over-Temperature Protection with Auto Recovery
● OVP, UVLO
● Hiccup Short Circuit Protection
● SOP-8 Exposed Pad Package
 
Applications
● STB (Set-Top-Box)
● LCD Display, TV
● Distributed Power System
● Networking, XDSL Modem
 

Pin Assignments

Ordering Information

SP Package (SOP-8 Exposed Pad)


Figure
1. Pin Assignment of FR9889

 

 

 

Typical Application Circuit

 

Figure 2. CIN /COUT use Ceramic Capacitors Application Circuit

Figure 3. CIN/COUT use Electrolytic Capacitors Application Circuit

 
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