18V Operation 0.5A Synchronous Step-Down DC/DC Converters
The XC9264 series are 18V operation synchronous step-down DC/DC converter ICs with a built-in high-side / low-side driver transistor. The XC9264 series has operating voltage range of 3.0V~18.0V and it can support 500mA 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. XC9264 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 and thermal shutdown are embedded and they secure a safety operation.
Feature
| Input Voltage | 3V to 18V (20V rating) |
| FB Voltage | 0.75V ±1.5% |
| Oscillation Frequency | 500kHz, 1.2MHz, 2.2MHz |
| Maximum Current | 500mA |
| Control Method | PWM/PFM control Efficiency: 85% @ 12V→5V, 1mA |
| Soft-start Function | Externally adjustable (external RC) |
| Protection Functions | Overcurrent limiting Auto-recovery (Type B) Integration latch (Type A) Thermal shutdown |
| Environmentally Friendly | EU RoHS compliant, Pb free |
Typical Application Circuit
Packages
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