The FR9850F 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 2A continuous load current capability. It is constant on time pulse width modulation (PWM) controller that supports FCOT mode control. Operation frequency depends on Input and output voltage condition.
The FR9850F 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 FR9850F 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 FR9850F is offered in SOT-23-6 package, which provides good thermal conductance.

• Low RDS(ON) Integrated Power MOSFET (145mΩ/90mΩ)
• Wide Input Voltage Range: 4.5V to 18V
• Output Voltage Range: 0.6V to 8V
• 2A Output Current
• FCOT Mode Enables Fast Transient Response
• Pseudo 850kHz Frequency
• Input Under Voltage Lockout
• Internal 1ms Soft-Start
• Cycle-by-Cycle Current Limit
• Hiccup Short Circuit Protection
• Over Temperature Protection with Auto Recovery
• SOT-23-6 Package