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