General Description
XC9505 series are PWM controlled, PWM/PFM switching 2 channel (step-down and inverting) DC/DC controller ICs. With 0.9V of
standard voltage supply internal, and using externally connected components, the output 1 voltage (step-down DC/DC controller)
can be set freely within a range of 0.9V to 6.0V. Since output 2 (inverting DC/DC controller) has a built-in 0.9V reference voltage
(accuracy ±2%), a negative voltage can be set with the external components.
With a 180kHz frequency, the size of the external components can be reduced. Switching frequencies of 300kHz and 500kHz are
also available as custom designed products.
The control of the XC9505 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 through to large output currents. Noise is easily reduced with PWM control since the frequency is fixed.
The series gives freedom of control selection so that control suited to the application can be selected. Soft-start time is internally set
to 10msec (output1) which offers protection against rush currents and voltage overshoot when the power is switched on.
Features
Output 1: Step-Up DC/DC Controller
- Output Voltage Range : 0.9V ~ 6.0V (set by FB1 pin)
- Output Current : More than 1000mA
(VIN=5.0V, VOUT=3.3V)
- Maximum Duty Ciycle : 100%
Output 2: Step-Down DC/DC Controller
- Output Voltage Range : -30V ~ 0V (set by FB2 pin)
- Output Current : More than -100mA
(VIN=5.0V, VOUT= - 3.3V)
- Maximum Duty Cycle : 80% (TYP.)
Common
- Operating Voltage Range : 2.0V ~ 10.0V
- Oscillation Frequency : 180kHz (±15%)
* 300kHz, 500kHz custom
Applications
- PDAs
- Palmtop computers
- Digital Cameras
- Various multi function power supplies
Typical Application Circuit
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