XC9267 Series
ETR05054-002 36V Operation 600mA Synchronous Step-Down DC/DC Converters ■GENERAL DESCRIPTION
The XC9267 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 XC9267 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 (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 using
external resistors (RFB1, RFB2).
1.2MHz or 2.2MHz can be selected for the switching frequency.
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. ■APPLICATIONS ■FEATURES
: 3.0 ~ 36V (Absolute Max 40V) ● Electric Meter Input Voltage Range ● Gas Detector Output Voltage Range ● Various Sensor FB Voltage : 0.75V±1.5% Oscillation Frequency : 1.2MHz, 2.2MHz Output Current : 600mA Control Methods : PWM control Soft-start Time : Adjustable by RC Protection Circuits : Over Current Protection : Thermal Shutdown Output Capacitor : Ceramic Capacitor Operating Ambient Temperature : -40℃ ~ + 105℃ Packages : SOT-89-5 (Without Power Good) : USP-6C (With Power Good) ● Industrial Equipment
● Home appliance 1.0 ~ 25V Efficiency88%@12V→5V, 300mA Environmentally Friendly ■TYPICAL APPLICATION CIRCUIT EU RoHS Compliant, Pb Free ■TYPICAL PERFORMANCE
CHARACTERISTICS
XC9267B75Cxx
(VIN=12V, VOUT=5V, fOSC=1.2MHz) L CIN 2.2μF CFB
EN/SS L=6.8μH(CLF5030NIT-6R8), CIN=4.7μF×2(C2012X6S1H475K)
CL=10μF×2 (C3216X7R1E106K) Lx 100 RFB1 90 FB
CL
RFB2
RPG GN D PG 10μF×2 Efficiency :EFFI[%] VIN 80 …
