The KF9105 series is a CMOS step-up switching regulator which mainly consists of a reference voltage source, an oscillation circuit, an error amplifier, a phase compensation circuit, a PWM/PFM switching control circuit. With an external low-ON-resistance Nch Power MOS, this product is applicable to applications re high efficiency and high output current.The KF9105 series switches its operation to the PFM control circuit whose duty ratio is 15 % with to the PWMPFM switching control circuit under a light load and to prevent decline in the efficiency by IC operation current.

     Features

Low voltage operation: Start-up is guaranteed from 0.9 V(lout =1 mA )

Efficiency: 90%

Duty ratio: Buit-in PWM/PFM switching control

circuit 15 to 78 % .

oscillator frequency: 1.0MHz

External parts: coil, diode， capacitor, and transistor

Output voltage range: 1.5V -6.5 V

Output voltage accuracy: +2%

Soft start function: 2 mS.

PACKAGE: SOT23-5

    Typical Application

lphone, IPAD, mobile back-up power

MP3 players, digital audio players

Digital cameras, GPS, wireless transceiver

Portable devices