XCL230/XCL231 Series ETR28019-002 36V, 600mA Inductor Built-in Step-down micro DC/DC Converter GENERAL DESCRIPTION The XCL230/XCL231 Series is a small (3.0mm3.0mm, h=1.7mm) 36V, 600mA step-down DC/DC converter with an integrated control IC and coil. Integrating the coil makes for easier circuit board layout and minimizes malfunction and noise from the component and wiring layout. The input voltage range is 3.0 to 36V, the switching frequency is 1.2MHz, and a synchronous rectification circuit is used to achieve a stable power supply at high efficiency. The XCL230 Series fixes the operation frequency using PWM control to suppress output ripple voltage. The XCL231 Series automatically switches between PWM and PFM control to reduce loss by lowering the operation frequency during low loads to achieve high efficiency across the entire range from low to high loads. A 0.75V standard voltage supply is built in, and the output voltage can be set to 1.0V to 5.0V using an external resistance. The soft start time is internally set to 2.0ms, and a time that is longer than the internal soft-start can be freely set depending on the resistance and capacity connected to the EN/SS pin. An overcurrent protection function and thermal shutdown function are built in as protective functions to ensure safe use in the event of a short circuit. FEATURES APPLICATIONS Input Voltage Range : 3.0V ~ 36V (Absolute Max 40V) Electricity Meters Output Voltage Range : 1.0V ~ 5.0V Gas Detectors FB Voltage : 0.75V 1.5% Various Sensors Output Current : 600mA Industrial Equipment Oscillation Frequency : 1.2MHz Home Appliances Efficiency : 86%(V =12V,V =5V, I =300mA) IN OUT OUT Control Methods : PWM control (XCL230) : PWM/PFM Auto (XCL231) Function : Soft-start External settings Power good Over Current Protection Protection Circuits : (Automatic recovery) Thermal Shutdown Output Capacitor : Ceramic Capacitor Operating Ambient Temperature : -40 ~ 105 Packages : DFN3030-10B Environmentally Friendly : EU RoHS Compliant, Pb Free TYPICAL APPLICATION CIRCUIT TYPICAL PERFORMANCE CHARACTERISTICS XCL230/XCL231 VIN=VEN/SS=12V, VOUT=5.0V C =4.7F(UMK212BBJ475KG), IN1 CIN2=0.1F(UMK107BJ104MAHT) 100 RPG CL=22F(TMK212BBJ226MG) 90 Lx L1 PG PG 80 V EN/SS EN/SS VOUT L2 70 60 V IN V CFB C IN L R FB1 FB 50 C CIN1 IN2 GND 40 RFB2 30 XCL230 20 XCL231 10 0 0.1 1 10 100 1000 Output current : I mA OUT 1/37 Efficiency : EFFI % XCL230/XCL231 Series BLOCK DIAGRAM L1 L2 Inductor V IN Local Reg Each Circuit Under Gate Voltage CLAMP Lock Out Current SENSE Thermal Operation Each Shutdown Enable Circuit CE Controller EN/SS Logic Current Current Vref Current Feed Limit Soft Start Limit Back PFM High Side Buffer PWM/PFM Controller FB Lx Logic Low Error Side PWM Amp. Buffer Comparator Ramp Wave Oscillator Generator PG GND Power-Good Comparator *PWM/PFM Controller Logi in the XCL230 series is fixed to PWM control. PWM/PFM Controller Logi In the XCL231 series is fixed to PWM/PFM automatic switching control. Diodes inside the circuit are an ESD protection diode and a parasitic diode. 2/37