30V Driver Transistor Built-in Step-Down DC/DC Converters

The XC9271 series are 30V operation step-down DC/DC converter ICs with an internal driver transistor. The internal Nch driver transistor is driven by bootstrap to achieve a stable, high-efficiency power supply up to an output current of 2.0A. Low ESR capacitors such as ceramic capacitors can be used for the load capacitor (CL).

A 0.8V reference voltage source is incorporated in the IC, and the output voltage can be set to a value from 1.2V to 12.0V using external resistors (RFB1, RFB2).

300kHz or 500kHz can be selected for the switching frequency. The generation of unneeded noise can be reduced by synchronization with an external CLK within the range ±25% of the internal clock using the SYNC pin. In automatic PWM/PFM control, the IC operates by PFM control when the load is light to achieve high efficiency over the full load range from light to heavy.

The soft start time can be set as desired by adding an external capacitance to the SS pin.

With the built-in UVLO function, the driver transistor is forced OFF when input voltage becomes 4.6V or lower.

Internal protection circuits include over current protection, integral latch protection, short-circuit protection, and thermal shutdown circuits to enable safe use.


Input Voltage Range7~30V
FB Voltage0.8V(±2%)
Oscillation Frequency300kHz,500kHz
Maximum Output Current:2.0A
Control MethodsPWM/PFM
Soft-StartExternally Set (set by external capacitor C)
Protection CircuitsOver Current Protection 3.2A(TYP.)
Integral Latch Method(XC9271A)
Automatic Recovery(XC9271B)
Thermal Shut Down
Low ESR CapacitorLow ESR Ceramic
Operating Ambient Temperature-40℃~105℃
Environmentally FriendlyEU RoHS compliant, Pb free

Typical Application Circuit

Quality Reports

Technical Document


Package Number of Pins Pcs/Reel Package Size(mm)
SOP-8FD 8 1,000 6.0 x 4.9 x 1.75

XC9271 Series Part Numbers

Part number Sample Functional selection Output Voltage Oscillation Frequency Packages EDA Online Store
XC9271A083QR-G With Latch protection 0.8V 300kHz SOP-8FD
XC9271A085QR-G With Latch protection 0.8V 500kHz SOP-8FD
XC9271B083QR-G Without Latch protection 0.8V 300kHz SOP-8FD
XC9271B085QR-G Without Latch protection 0.8V 500kHz SOP-8FD

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