General Description
The XC9501 series are PWM controlled, PWM/PFM automatic switching controlled, multi-functional, dual step-up DC/DC
converter controller ICs.
With 0.9V (±2%) of standard voltage supply internal, and using externally connected components, output voltage can be
set freely on both DC/DC controllers between 1.5V to 30V.
With a 180kHz frequency, the size of the external components can be reduced. 100kHz, 300kHz and 500kHz switching
frequencies are also available as custom-designed products.
The control of the XC9501 series can be switched between PWM control and PWM/PFM automatic switching control using
external signals. Control switches from PWM to PFM during light loads when automatic switching is selected and the series
is highly efficient from light loads to large output currents. Noise is easily reduced with PWM control since the switching
frequency is fixed.
The XC9501 series provides the option of being able to select the control suited to the application.
Soft-start time is internally set to 10msec which offers protection against rush currents when the power is switched on and
also against voltage overshoot.
Features
- Input Voltage Range : 0.9V ~ 10V
- Supply Voltage Range : 2.0V ~ 10V
- Output Voltage Range : 1.5V ~ 30V (set by FB1/FB2 pins)
- Output Current : More than 200mA
(VIN=1.8V, VOUT=3.3V)
- Switching Frequency : 180kHz (±15%)
Applications
- PDAs
- Palmtop computers
- Portable audio equipment
- Various multi function power supplies
Typical Application Circuit
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