XC9264B75CMR-G Torex Semiconductor

XC9263/XC9264 Series ETR05047-006 18V Operation 0.5A Synchronous Step-Down DC/DC Converters GENERAL DESCRIPTION The XC9263/XC9264 series are 18V operation synchronous step-down DC/DC converter ICs with a built-in high-side / low-side driver transistor. The XC9263/XC9264 series has operating voltage range of 3.0V~18.0V and it can support 500mA as an output current with high-efficiency. Compatible with Low ESR capacitors such as ceramic capacitors for the load capacitor (C ). L 0.75V reference voltage source is incorporated in the IC, and the output voltage can be set to a value from 1.0V to 15.0V using external resistors (R , R ). FB1 FB2 500kHz or 1.2MHz or 2.2MHz can be selected for the switching frequency. In PWM/PFM automatic switchover control, IC can change the control method between PWM and PFM based on the output current requirement and as a result IC can achieve high efficiency over the full load range. XC9263/64 has a fixed internal soft start time which is 1.0ms (TYP.), additionally the time can be extended by using an external resistor and capacitor. With the built-in UVLO function, the driver transistor is forced OFF when input voltage goes down to 2.7V or lower. The output state can be monitored using the power good function. Over current protection and thermal shutdown are embedded and they secure a safety operation. FEATURES APPLICATIONS Input Voltage Range : 3.0 ~ 18V (Absolute Max 20V) Hot water supply system FB Voltage : 0.75V1.5% Recorders, Camcorders Oscillation Frequency : 500kHz, 1.2MHz, 2.2MHz Refrigerators, Air-conditioners Output Current : 500mA Low Power Systems Control Methods : PWM/PFM Auto Efficiency 85% 12V5V, 1mA PWM control Soft-start Time : Adjustable by RC Protection Circuits : Over Current Protection Automatic Recovery (B Type) Integral Latch Method (A Type) Thermal Shutdown Output Capacitor : Ceramic Capacitor Package : SOT-25 (No Power good) USP-6C (With Power Good) Environmentally Friendly : EU RoHS Compliant, Pb Free TYPICAL APPLICATION CIRCUIT TYPICAL PERFORMANCE CHARACTERISTICS XC9264x75C (V =12V, V =5V, fOSC=1200kHz) IN OUT L V Lx IN L=4.7 H(CLF6045NIT-4R7), C =2.2 F(GRM188R61H225KE11), IN C =10 F 2 (GRM188R61E106MA73) C L IN R FB1 100 C FB 90 EN/SS FB 80 C L R 70 FB2 R PG 60 GND PG 50 40 30 20 XC9264x75C 10 0 0.1 1 10 100 Output Current :I mA OUT 1/30 Efficiency :EFFI % XC9263/XC9264 Series BLOCK DIAGRAM V IN Current LocalReg SENSE Chip EN/SS Enable each Current circuit Current Current feed Limit High Limit back PFM Side Buffer Gate Under Lx CLAMP Voltage Low Lock Out Side Buffer Thermal each Shutdown circuit Operation Enable Vref + Soft Start Err Amp + PWM PWM/PFM - FB Comparator ControlLOGIC - GND Ramp OSC Wave PG(USP-6C Package Only) + - PowerGood Comparator *Diodes inside the circuit are an ESD protection diodes and a parasitic diodes. 2/30