XC9246/XC9247 Series ETR05024-006 16V Driver Transistor Built-In Step-Down DC/DC Converters GreenOperation-compatible GENERAL DESCRIPTION XC9246/XC9247 series is a 16V step-down DC/DC converter with a built-in driver transistor. The series provides high efficiency, and a stable power supply with output currents up to 1A. The series is designed for use with small ceramic capacitors. The series has a 1.0V reference voltage, and using externally connected resistors, the output voltage can be set freely. With an internal switching frequency of 1.2MHz, small external components can be used. The soft-start time is internally set to 1.5ms (TYP.), but can be adjusted to set a longer time using an external resistor and capacitor. As for operation mode, the XC9246 series is PWM control and the XC9247 series is automatic PWM/PFM switching control. In PWM/PFM switching control mode, provides fast response, low ripple and high efficiency over the full range of loads (from light load to heavy load). With the UVLO (Under Voltage Lock Out) function, the internal driver transistor is forced OFF when input voltage becomes lower than detect voltage. The series includes current limit, thermal shutdown, and short-circuit protection. Two types of package SOT-26W and USP-6C are available. FEATURES APPLICATIONS Input Voltage : 4.5V16V LCD-TVs (The VIN range depends on the product) Output Voltage Range : 1.2V5.6V (VFB=1.0V) BD/HDD recorders (The VOUT range depends on the product) Set top box Output Current : 1A (VIN6V and VOUT/VIN50%) 1A (VIN6V and VOUT/VIN40%) Home video game consoles Efficiency :90%(VIN=12V, VOUT=5V, IOUT=200mA) Multifunction printers Oscillation Frequency : 1.2MHz Maximum Duty Cycle : 80% Soft-start Time : Internally fixed 1.5ms Adjustable by RC Control Methods : PWM Control (XC9246) PWM/PFM Automatic switching control (XC9247) Protection Circuits : Current limiter (Integral Latching) Thermal shutdown Short-circuit protection UVLO : 4.15V, 5.65V, 7.65V Output Capacitor : Ceramic Capacitor Compatible Operating Ambient Temperature :-40+85 Packages :USP-6C, SOT-26W Environmentally Friendly : EU RoHS Compliant, Pb Free TYPICAL PERFORMANCE TYPICAL APPLICATION CIRCUIT CHARACTERISTICS XC9246B75/XC9247B75 (V =5.0V) OUT L=6.8H(VLP4045LT-6R8M), SBD=XBS204S19R C =10 F(TMK316BJ106KL), C =10 F2(LMK212ABJ106KG) IN L 100 90 80 70 60 50 40 30 XC9246 VIN=12V 20 XC9247 VIN=12V 10 0 1 10 100 1000 Output Current :I (mA) OUT 1/33 Efficiency :EFFI(%) XC9246/XC9247 Series (*1) (*2) (*3) BLOCK DIAGRAM (*1) Diodes inside the circuit are an ESD protection diode and a parasitic diode. (*2) The XC9246 offers a fixed PWM control, a Control Logic to PWM/PFM Selector is fixed internally. (*3) The XC9247 control scheme is a fixed PWM/PFM automatic switching, a Control Logic to PWM/PFM Selector is fixed internally. PRODUCT CLASSIFICATION Ordering Information XC9246B- PWM Control XC9247B- PWM/PFM Automatic switching control DESIGNATOR ITEM SYMBOL DESCRIPTION 42 4.15V (1.2VV 2.7V) OUT 65 5.65V (1.2VVOUT3.8V) UVLO Release Voltage 7.65V 75 (XC9246: 1.5VVOUT5.0V) (XC9247: 1.5VVOUT5.6V) Oscillation Frequency C 1.2MHz ER-G USP-6C (3,000pcs/Reel) (*1) - Packages (Order Unit) MR-G SOT-26W (3,000pcs/Reel) (*1) The -G suffix denotes Halogen and Antimony free as well as being fully EU RoHS compliant. Selection Guide THERMAL TYPE EN/SS CURRENT LIMIT LATCH UVLO SHUTDOWN B Yes Yes Yes Yes Yes 2/33