General Description
The XC9107 series is 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.
Oscillation frequencies of high clock, low ripple 300kHz and low supply current 100kHz are available.
The XC9107 series are PWM/PFM automatic switching controlled. Control switches from PWM to PFM during light loads with
the XC9107 and the series is highly efficient from light loads to large output currents. By bringing the whole circuit down
while the series is in the stand-by mode (CE/PWM pin: low), supply current can be reduced to less than 1.0μA.
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
Applications
- Power supply for LCDs
- PDAs
- Cellular phones
- Palmtop computers
- Portable audio systems
- Various multi-function power supplies
Typical Application Circuit
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