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.