XC9268 Series

36V Operation 0.6A Synchronous Step-Down DC/DC Converters

The XC9268 series are 36V operation synchronous step-down DC/DC converter ICs with a built-in P-channel MOS driver transistor and N-channel MOS switching transistor. The XC9268 series has operating voltage range of 3.0V~36.0V and high-efficiency power supply up to an output current of 0.6A. Low ESR capacitors such as ceramic capacitors can be used for the load capacitor (CL).

A 0.75V reference voltage source is incorporated in the IC, and the output voltage can be set to a value from 1.0V to 25.0V usingexternal resistors (RFB1,RFB2).

1.2MHz or 2.2MHz can be selected for the switching frequency. 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 is internally set to 2.0ms (TYP.), but can be adjusted to set a longer time using an external resistor and capacitor.

With the built-in UVLO function, the driver transistor is forced OFF when input voltage becomes 2.7V or lower.The output state can be monitored using the power good function. Internal protection circuits include over current protection, short-circuit protection, and thermal shutdown circuits to enable safe use.

Typical Application Circuit


Input Voltage Range 3.0 ~ 36V (Absolute Max 40V)
Output Voltage Range 1.0 ~ 25V
FB Voltage 0.75V ± 1.5%
Oscillation Frequency 1.2MHz, 2.2MHz
Output Current 600mA
Quiescent Current 12.5μA (1.2MHz)
13.5μA (2.2MHz)
Control Methods PWM/PFM Auto
Efficiency 83%@12V→5V、1mA
Soft-start Time Adjustable by RC
Protection Circuits Over Current Protection
Thermal Shutdown
Output Capacitor Ceramic Capacitor
Operating Ambient Temperature - 40℃ ~ + 105℃
Environmentally Friendly EU RoHS Compliant, Pb Free



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