General Description
The XC9303 series is highly efficient, synchronous PWM, PWM/PFM switchable step-up & down DC/DC controller ICs.
A versatile, large output current and high efficiency, step-up/down DC/DC controller can be realized using only basic
external components - transistors, coil, diode, capacitors, and resistors for detecting voltages. High efficiency is obtained
through the use of a synchronous rectification topology. 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 rectification 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 2.0V to 6.0V. 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 (±15%)
- Output Current : More than 800mA
- Stand-By Function : 3.0μA (MAX.)
Applications
- PDAs
- Palmtop computers
- Portable audio equipment
- Various power supplies
Typical Application Circuit
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