XC9248 Series

2.2A 18V Driver Transistor Built-In Synchronous Step-Down DC/DC Converter

The XC9248 series is 18V bootstrap synchronous step-down DC/DC converter with built-in Nch-Nch driver transistors.

With an input voltage range from 4.5V to 18V and a maximum output current of 2.2A, the series is suitable for digital home appliance power supplies and can be used with small ceramic capacitors.

The series has a 0.8V reference voltage, and using externally connected resistors, the output voltage can be set freely from 1.0V to 12V.

The control method is synchronous PWM (Source/ Sink). The soft start time is internally set to 2.8ms (TYP.), also can be adjusted using external capacitor.

With UVLO (Under Voltage Lock Out) function, the internal driver transistors are forced OFF when input voltage falls down below 3.8V (TYP.).

The series includes over current protection, VOUT short-circuit protection, LX short-circuit protection, VOUT overvoltage protection and thermal shutdown.

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Feb 27, 2014
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【New Product Leaflet】XC9248 Series
Jan 25, 2013
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2.2A Maximum Output Current, 18V Driver Transistor Built-In Synchronous Step-Down DC/DC Converter XC9248 Series

Typical Application Circuit


Input Voltage Range 4.5V~18V
Output Voltage Range 1.0V~12V(VFB=0.8V±1.5%)
Output Current 2.2A
Efficiency 93.8%(*1)@VIN=12V,VOUT=5V,IOUT=700mA
Oscillation Frequency 500kHz
Maximum Duty Cycle 79%
Soft-Start Fixed 2.8ms, set by external capacitor
Protection Circuits UVLO
High side over current protection
Low side over current protection
VOUT Short-Circuit Protection
LX Short-Circuit Protection
VOUT Over voltage protection
Thermal shutdown
Environmentally Friendly EU RoHS compliant, Pb free



Technical Document

Quality Reports


QuestionHow does the CL discharge function work?

The function rapidly releases the charge remained in the CL capacitor to make the VOUT pin voltage zero. The VOUT pin voltage does not reach zero immediately after being turned off by the CE function due to the charge remained in the connected CL capacitor. While the charge in the CL capacitor is gradually reaching zero, the LSI continues operating and does not work with the CE pin signal, which may cause a malfunction. This is why the discharge is required when turning off the CE pin. A larger capacitance of the capacitor needs longer time to be discharged.

QuestionWhat does CL mean?

Load capacitor. Other companies often refer to it as COUT.

QuestionWhat is the standby current?

The current that flows through the IC in the standby mode. The standby mode means the state where the IC has been turned off by the CE function.