1 FR9801-Preliminary 0.1-SEP-2011 FR9801 fitipower integrated technology lnc. 21V, 1.8A, 600KHz Synchronous Step-Down DC/DC Converter Pin Assignments S6 Package (SOT-23-6) 213645(Marking)BSTLXGND FBVIN SHDN Figure 1. Pin Assignment of FR9801 Ordering Information SOT-23-6 Marking Part Number Product Code FR9801S6CTR B1G Description The FR9801 is a synchronous step-down DC/DC converter that provides wide 4.5V to 21V input voltage range and 1.8A continuous load current capability. The FR9801 fault protection includes cycle-by-cycle current limit, UVLO, output overvoltage protection and thermal shutdown. The adjustable 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 less than 1μA. The FR9801 is available in a SOT-23-6 package, provides good thermal conductance. Features ● High Efficiency up to 94% ● Low Rds(on) Integrated Power MOSFET ● Internal Compensation Function ● Wide Input Voltage Range: 4.5V to 21V ● Adjustable Output Voltage from 0.8V to 17.85V ● 1.8A Output Current ● Fixed 600KHz Switching Frequency ● Current Mode Operation ● Cycle-by-Cycle Current Limit ● Over-Temperature Protection with Auto Recovery ● Output Overvoltage Protection ● Under Voltage Lockout ● <1μA Shutdown Current ● SOT-23-6 Package Applications ● STB (Set-Top-Box) ● LCD Displays, TVs ● Distributed Power Systems ● Networking, XDSL Modems C: Green TR: Tape / Reel FR9801□□□ Package Type S6: SOT-23-6 2 FR9801-Preliminary 0.1-SEP-2011 FR9801 fitipower integrated technology lnc. Typical Application Ci...
