2A Synchronous Step-Down DC/DC Converters

The XC9243 series is a group of synchronous-rectification step-down DC/DC converters with a built-in 0.11Ω(TYP.) P-ch MOS driver transistor and 0.12Ω(TYP.) N-ch MOS switching transistor, designed to allow the use of ceramic capacitors. The small on-resistances of these two internal driver transistors enable a high efficiency, stable power supply with an output current up to 2A. The XC9243 series has operating voltage range of 2.7V~6.0V and a 0.8V (±2.0%) reference voltage, and using externally connected resistors, the output voltage can be set freely from 0.9V.

With an internal switching frequency of 1.2MHz or 2.4MHz, small external components can be used.

The series have a high speed soft-start as fast as 1ms in typical for quick turn-on. It’s suitable for large-current application due to limit current is configured 4.0A in typical. During stand-by, all circuits are shutdown to reduce current consumption to as low as 1.0μA or less.

The integrated CL discharge function which enables the electric charge at the output capacitor CL to be discharged via the internal discharge switch located between the LX and VSS pins. Due to CL discharge function, malfunction on LX is prevented when Stand-by mode. With the built-in UVLO (Under Voltage Lock Out) function, the internal P-channel driver transistor is forced OFF when input voltage becomes 2.5V or lower. The series are available in USP-10B and SOP-8FD packages.


Driver Transistor 0.11Ω P-ch Driver Transistor
0.12Ω N-ch Switching Transistor
Input Voltage Range 2.7V~6.0V
Output Voltage Range 0.9V~VIN
FB Voltage 0.8V±2.0%
High Efficiency 95%(TYP.)
Output Current 2.0A
Oscillation Frequency 1.2MHz±15%,2.4MHz±15%
Maximum Duty Cycle 100%
Functions Soft-Start,CL Discharge,Current Limit(Automatic return),Thermal Shut Down,UVLO
Capacitor Low ESR Ceramic
Control Methods PWM/PFM Auto
Operating Ambient Temperature -40℃~+85℃
Environmentally Friendly EU RoHS compliant, Pb free

Typical Application Circuit

Technical Document


Package Number of Pins Pcs/Reel Package Size(mm)
USP-10B 10 3,000 2.6 x 2.9 x 0.6

XC9243 Series Part Numbers

Part number Sample Reference Voltage Oscillation Frequency Package EDA Online Store
XC9243B08CDR-G 0.8V 1.2MHz USP-10B
XC9243B08DDR-G 0.8V 2.4MHz USP-10B

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