XC9223/XC9224 Series ETR0509 017 1A Driver Transistor Built-In Step-Down DC/DC Converters Green Operation Compatible GENERAL DESCRIPTION The XC9223/XC9224 series are synchronous step-down DC/DC converters with a 0.21 (TYP.) P-channel driver transistor and a synchronous 0.23 (TYP.) N-channel switching transistor built-in. A highly efficient and stable current can be supplied up to 1.0A by reducing ON resistance of the built-in transistor. With a high switching frequency of 1.0MHz or 2.0MHz, a small inductor is selectable therefore, the XC9223/XC9224 series are ideally suited to applications with height limitation such as HDD or space- saving applications. Current limit value can be chosen either 1.2A (MIN.) when the LIM pin is high level, or 0.6A (MIN.) when the LIM pin is low level for using the power supply which current limit value differs such as USB or AC adapter. With the MODE/SYNC pin, the XC9223/XC9224 series provide mode selection of the fixed PWM control or automatically switching current limit PFM/PWM control. As for preventing unwanted switching noise, the XC9223/XC9224 series can be synchronized with an external clock signal within the range of 25% toward an internal clock signal via the MODE/SYNC pin. For protection against heat damage of the ICs, the XC9223/XC9224 series build in three protection functions: integral latch protection, thermal shutdown, and short-circuit protection. With the built-in UVLO (Under Voltage Lock Out) function, the internal P-channel driver transistor is forced OFF when input voltage becomes 1.8V or lower. The XC9223B/XC9224B series detector function monitors the discretional voltage by external resistors. FEATURES APPLICATIONS Input Voltage Range : 2.5V ~ 6.0V Magnetic disk drive Output Voltage Range : 0.9V ~ V (set by FB pin) IN Oscillation Frequency : 1MHz, 2MHz (+15% accuracy) Note PCs / Tablet PCs Output Current : 1.0A CD-R / RW, DVD Maximum Current : 0.6A (MIN.) ~ 0.9A (MAX) Limit with LIM pin=L Mobile devices / terminals : 1.2A (MIN.) ~ 2.0A (MAX.) Digital still cameras / Camcorders with LIM pin=H Controls : PWM/PFM or PWM by MODE pin Multi-function power supplies Protection Circuits : Thermal shutdown Integral latch method Cellular and portable phones Short-circuit protection On-board power supplies Soft-Start Time : 1ms (TYP.) internally set Voltage Detector : 0.712V Detection, Li-ion battery systems N-channel open drain Built-in P-channel : 0.21 MOSFET Built-in Synchronous : 0.23 N-channel MOSFET (No Schottky Barrier Diode Required) High Efficiency : 95% (VIN=5.0V, VOUT=3.3V) Synchronized with an External Clock Signal Ceramic Capacitor Compatible Packages : MSOP-10, USP-10B Environmentally Friendly : EU RoHS Compliant, Pb Free TYPICAL PERFORMANCE TYPICAL APPLICATION CIRCUIT CHARACTERISTICS Efficiency vs. Output Current XC9223B081Ax XC9223B081Ax VIN=5V, FOSC=1MHz, VIN=5V, FOSC=1MHz, L=4.7uH(CDRH4D28C), L=4.7 H (CDRH4D28C), CIN=10 F (ceramic), CL=10 F (ceramic) CIN=10uF(ceramic), CL=10uF(ceramic) 100 90 80 70 VOUT=3.3V 60 50 VOUT=1.5V 40 (*1) A capacitor of 2200pF 0.1 F is recommended to place at the C between the AGND DD 30 pin and the V pin. IN 20 PWM/PFM Please refer to the page showing INSTRUCTION ON PATTERN LAYOUT for more detail. PWM 10 0 1 10 100 1000 Output Current: IOUT (mA) 1/24 Efficiency: EFFI (%) XC9223/XC9224 Series BLOCK DIAGRAM XC9223B/XC9224B Series VIN LIM Current Limit PFM Error Amp. Comparator FB PWM Buffer Logic Driver Current LX Feedback Vref with Soft-Start, CE CE PGND Ramp Wave MODE/ Thermal PMW/PFM AGND Generator, Shutdown SYNC OSC VD VDOUT VDIN PRODUCT CLASSIFICATION Ordering Information (*1) XC9223- <The common CE pin in the DC/DC block and the voltage detector block.> ( ) *1 XC9224- <No CE pin in the voltage detector block. (Constant operating of the voltage detector block) > DESIGNATOR ITEM SYMBOL DESCRIPTION Transistor built-in, Type B Output voltage freely set (FB voltage), Current Limit: 0.6A/1.2A Fixed reference voltage Reference Voltage 08 =0, =8 1 1.0MHz DC/DC Oscillation Frequency 2 2.0MHz AR MSOP-10 (1,000pcs/Reel) AR-G MSOP-10 (1,000pcs/Reel) Packages - (Order Unit) DR USP-10B (3,000pcs/Reel) DR-G USP-10B (3,000pcs/Reel) (*1) The -G suffix denotes Halogen and Antimony free as well as being fully EU RoHS compliant. Selection Guide 2/24