■ GENERAL DESCRIPTION

The XC9106 / 07 series are step-up DC/DC controller ICs with an externally applied reference voltage (Vref). Output voltage will be set with external resistors (RFB1 and 2) and Vref value. The series make it easy to control output voltage externally and are suited to software applications that need to vary voltage, such as LCD power supply for PDA.
Output will be stable no matter which load capacitors are used but if a low ESR capacitor is used, RSENSE of about 0.1Ω will be required and phase compensation will be achieved. This makes the use of ceramic capacitors much easier, and allows for lower output ripple and reduced PCB area requirements. Tantalum and electrolytic capacitors can also be used, in which case, RSENSE becomes unnecessary.

■ FEATURES

Input Voltage : 0.9V ~ 10V
Power
Supply Voltage Range : 1.8V~10.0V and more than Vref+0.7V
VREF Input Range : 0.8V~2.5V (± 2.0%)
Output Voltage : Vref x external split resistor ratio
VOUT=Vref x (RFB1+RFB2)/RFB2
Oscillation Frequency : 300kHz, 100kHz (± 15%)
Output Current : More than 30mA
(VIN=3.3V, VOUT=20V,
when external components are
used as in the circuits below.)
Controls : PWM (XC9106)
: PWM/PFM auto-switching (XC9107)
High Efficiency : 85% (TYP.)
Stand-by Current : ISTB = 1.0μA (MAX.)
Load Capacitors : Low ESR capacitors compatible
Externally Applied Reference Voltage (Vref)
Packages : SOT-25, USP-6B

■ APPLICATIONS

● Power supply for LCDs
● PDAs
● Cellular phones
● Palmtop computers
● Portable audio systems
● Various multi-function power supplies