XC9276 Series

Ultra-Low Quiescent Current, Synchronous Step-Down PFM DC/DC Converter with Output voltage selectable function

XC9276 series are Ultra Low Quiescent Current synchronous-rectification type PFM step down DC/DC converters with a built-in 0.3Ω (TYP.)Pch driver and 0.3Ω (TYP.) Nch synchronous switching transistor with Output voltage selectable function, designed to allow the use of ceramic capacitor.

PFM control enables an ultra-low quiescent current, making these products ideal for battery operated devices that require high efficiency and long battery life.Only inductor, CIN and CL capacitors are needed as external parts to make a step down DC/DC circuit.Operation voltage range is from 1.8V to 6.0V. This product has fixed two output voltage from 0.6V to 3.6V(accuracy: ±2.0%) inincrements of0.1V.By SET terminal the output voltage is selectable among two preset voltages to supply an ideal voltage based on the status of the application. During stand-by, all circuits are shutdown to reduce consumption to as low as 0.1μA or less.

With the built-in UVLO (Under Voltage Lock Out) function, the internal P-channel MOS driver transistor is forced OFF when input voltage gets lower than UVLO detection voltage. Besides, the standard product has UVLO detection voltage of 1.4V.

The product with CL discharge function can discharge CL capacitor during stand-by mode due to the internal resistance by turning on the internal switch between VOUT -GND. This enables output voltage restored to VSS level fast.

Typical Application Circuit


Input Voltage Range 1.8V ~ 6.0V
Output Voltage Setting 0.6V ~ 3.6V (0.05V increments)
2.0V ~ 3.6V (0.1V increments)
Output Voltage Accuracy ±20mV (VOUT(T)≦1.0V)
±2.0% (VOUT(T)>1.0V)
Output Current 150mA
Supply Current 200nA @ VOUT(T)=1.8V (TYP.)
Control Method PFM Control
Function Output Voltage Selectable Function
CL Discharge(D Type)
UVLO Function
Protection Functions Short Protection
Input / Output Capacitor Ceramic Capacitor Compatible
Environmentally Friendly EU RoHS Compliant, Pb Free



Technical Document