The KF8353 is a CMOS PFM-control step-up switching DC/DC converter. The VFM controller allows the duty ratio to be automatically switched according to the load， enabling products with a low ripple over a wide range, high efficiency, and high output current. With the KF8353， a step-up switching DC/DC converter can be configured by using an external coil, capacitor, and diode. The built-in MOSFET is turned off by a protection circuit when the voltage at the LX pin exceeds the limit to prevent it from being damaged. This feature, along with the mini package and low current consumption, makes the KF 8353 ideal for applications such as the power supply unit of portable equipment.
Features
Low voltage operation: Startup at 0.9 V @louτ= 1 mA
Work frequency: 300KHz
External parts: Coil, capacitor, diode
Accuracy of +2.5%
High efficiency: 88%
Shutdown function
Low ripple, Low noise
Application
Digital cameras
Electronic notebooks and PDAs
Portable CD/MD players
Cameras, video equipment,
Communications equipment
Power supply for microcomputers