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FR9855 - 5.5A Synchronous Step-Down DC/DC Converter

General Description

The FR9855 is a synchronous step-down DC/DC converter with fast constant on time (FCOT) mode control.

The device provides 4.5V to 18V input voltage range and 5.5A continuous load current capability.

Operation frequency depends on Input and output voltage condition.

Key Features

  • Low RDS(ON) Integrated Power MOSFET (70mΩ/38mΩ) Wide Input Voltage Range: 4.5V to 18V Output Voltage Range: 0.765V to 8V 5.5A Output Current FCOT Mode Enables Fast Transient Response Pseudo 630kHz Frequency Power Good Function (for FR9855SP Only) Input Under Voltage Lockout Adjustable Soft Start Function Cycle-by-Cycle Current Limit Hiccup Short Circuit Protection Over Temperature Protection with Auto Recovery SOP-8 Exposed Pad and TDFN-10(3mmx3mm) Packages.

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Datasheet Details

Part number FR9855
Manufacturer Fiti
File Size 5.52 MB
Description 5.5A Synchronous Step-Down DC/DC Converter
Datasheet download datasheet FR9855 Datasheet

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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FR9855 18V, 5.5A Synchronous Step-Down DC/DC Converter Description The FR9855 is a synchronous step-down DC/DC converter with fast constant on time (FCOT) mode control. The device provides 4.5V to 18V input voltage range and 5.5A continuous load current capability. Operation frequency depends on Input and output voltage condition. At light load condition, the FR9855 can operate at power saving mode to support high efficiency and reduce power loss. The FR9855 fault protection includes cycle-by-cycle current limit, short circuit protection, UVLO and thermal shutdown. The soft-start function prevents inrush current at turn-on.