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

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