18V Operation 0.5A Synchronous Step-Down DC/DC Converters
The XC9263/64 series are 18V operation synchronous step-down DC/DC converter ICs with a built-in high-side / low-side driver
transistor. The XC9263/64 series has operating voltage range of 3.0V～18.0V and it can support 0.5A as an output current with
high-efficiency. Compatible with Low ESR capacitors such as ceramic capacitors for the load capacitor (CL).
0.75V reference voltage source is incorporated in the IC, and the output voltage can be set to a value from 1.0V to 15.0V using
external resistors (RFB1, RFB2).
500kHz or 1.2MHz or 2.2MHz can be selected for the switching frequency. In PWM/PFM automatic switchover control, IC can
change the control method between PWM and PFM based on the output current requirement and as a result IC can achieve high
efficiency over the full load range.
XC9263/64 has a fixed internal soft start time which is 1.0ms (TYP.), additionally the time can be extended by using an external
resistor and capacitor.
With the built-in UVLO function, the driver transistor is forced OFF when input voltage goes down to 2.7V or lower.
The output state can be monitored using the power good function.
Over current protection, short-circuit protection and thermal shutdown are embedded and they secure a safety operation.
● Hot water supply system
● Recorders, Camcorders
● Refrigerators, Air-conditioners
● Low Power Systems
Input Voltage Range
Low ESR Ceramic Capacitor :
3～18V（Absolute Max 20V）
500kHz, 1.2MHz, 2.2MHz
Efficiency 85%@12V→5V, 1mA
Adjustable by RC
Over Current Protection
Integral Latch Method
SOT-25 (no Power good)
EU RoHS Compliant, Pb Free
■TYPICAL APPLICATION CIRCUIT
(VIN=12V, VOUT=5V, fOSC=1200kHz)
0.1 1 10 100
Output Current :IOUT[mA]