XC9268 Series
36V Operation 600mA Synchronous Step-Down DC/DC Converters ETR05071-001 ■GENERAL DESCRIPTION
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 600mA. Low ESR capacitors such as ceramic capacitors can be used for the load capacitor (C L).
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 using
external 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 and thermal shutdown circuits to enable safe use. ■FEATURES ■APPLICATIONS
● Electric Meter Input Voltage Range : 3.0 ~ 36V (Absolute Max 40V ● Gas Detector 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) : PWM/PFM Auto : Efficiency 83%@12V→5V、1mA Soft-start Time : Adjustable by RC Protection Circuits : Over Current Protection ● Various Sensor
● Industrial Equipment
● Home appliance Control Methods : Thermal Shutdown Output Capacitor : Ceramic Capacitor Operating Ambient Temperature : -40℃ ~ + 105℃ Packages : SOT-89-5 (Without Power Good)
USP-6C (With Power Good) Environmentally Friendly :
: ■TYPICAL APPLICATION CIRCUIT EU RoHS Compliant, Pb Free ■TYPICAL PERFORMANCE
CHARACTERISTICS
XC9268B75Cxx
(VIN=12V, VOUT=5V, fOSC=1.2MHz)
L=6.8μH(CLF5030NIT-6R8), CIN=4.7μF×2(C2012X6S1H475K)
CL=10μF×2 (C3216X7R1E106K) L …
