Products - Step-Up/Down

Synchronous Buck/Boost Converter

The XC9303 series is highly efficient, synchronous PWM and PWM/PFM switchable step-up & down DC/DC controller ICs. A versatile, large output current and high efficiency, step-up/down DC/DC circuit can be realized using only basic external components.

High efficiency is obtained through the use of a synchronous topology and the operation of the XC9303 series can be switched between PWM and PWM/PFM (auto switching) externally using the PWM pin. In PWM/PFM mode, the XC9303 automatically switches from PWM to PFM during light loads and high efficiencies can be achieved over a wide range of output loads conditions.

Output noise can be easily reduced with PWM control since the frequency is fixed. Synchronous control can be switched to non-synchronous by using external signals (MODE pin). High efficiency can be regulated at heavy loads when synchronous operation. The XC9303 has a 0.9V (±2.0%) internal voltage supply and using externally connected components, output voltage can be set freely between 1.5V to 10.0V. With an internal 300kHz switching frequency smaller external components can be used. Soft-start time is internally set to 10msec and offers protection against in-rush currents when the power is switched on and prevents voltage overshoot.

Features:

• Input Voltage Range: 2.0V ~ 10V
• Output Voltage Range: 2.0V ~ 6.0V
• Oscillation Frequency: 300kHz
• Max Output Current:  >800mA
• Stand-By Function: 3.0μA (max)
• Soft- time: 10ms (internally set)