電源管理ic-九游会登陆

fr9855

production

18v, 5.5a synchronous step-down dc/dc converter

applications

usb hub
router
introduction






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. the fr9855 use fast constant on time control that provides fast transient response, the noise immunity and all kinds of very low esr output capacitor for ensuring performance stabilization.
the fr9855 is offered in sop-8 (exposed pad) and tdfn-10 (3mm x 3mm) packages, which provides good thermal conductance.

feature
  • 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
package & pins
purchase
part name package request
fr9855sp sop-8 (exposed pad)

sample request

technical support

fr9855da tdfn-10

sample request

technical support

documents
title file release date
fr9855-18v 5.5a synchronous step-down dcdc converter 2023/01/13
网站地图