The KF6390 is a high efficiency, fixed frequency 550KHz, current mode PWM boost DC/DC converter which could operate battery such as input voltage down to 2.5V. The converter output voltage can be adjusted to a maximum of 5.25V by an external resistor divider. Besides the converter includes a 0.08Q N-channel MOSFET switch and 0.120 P-channel synchronous rectifier. So no external Schottky diode is required and could get better efficiency near 93%.The converter is based on a fixed frequency,current mode, pulse-width-modulation PWM controller that goes automatically into PSM mode at light load. mode at light load.When converter operation into discontinuous mode, the internal anti-ringing switch will reduce interference and radiated electromagnetic energy.

The KF6390 is available in a space saving SOT -23-6 package for portable application.

  Features

High Eficiency up to 93%

Low RDS(ON) Integrated Power MOSFET NMOS 80mQ / PMOS120mQ

Wide Input Voltage Range: 2.5V to 5.5V

Fixed 550KHz Switching Frequency

Low-Power Mode for Light Load Conditions

士2.0% Voltage Reference Accuracy

PMOS Current Limit for Short Circuit Protection

Low Quiescent Current

Output Ripple under 200mV. (Scope Full Bandwidth)

Fast Transient Response

Built-In Soft Start Function

Over-Temperature Protection with Auto Recovery

Output Overvoltage Protection

Space- Saving SOT-23-6 Package

  Application

Portable Power Bank.

Wireless Equipment.

Handheld Instrument.

GPS Receiver.

同步DC-DC升压IC

同步DC-DC升压IC 同步DC-DC升压IC