XC9265 Series ETR05053-007 Ultra Low Power Synchronous Step-Down PFM DC/DC Converter GreenOperation Compatible GENERAL DESCRIPTION XC9265 series are Ultra Low Power synchronous-rectification type PFM step down DC/DC converters with a built-in 0.4 (TYP.) Pch driver and 0.4 (TYP.) Nch synchronous switching transistor, designed to allow the use of ceramic capacitor. PFM control enables a low quiescent current, making these products ideal for battery operated devices that require high efficiency and long battery life. Only inductor, CIN and CL capacitors are needed as external parts to make a step down DC/DC circuit. Operation voltage range is from 2.0V to 6.0V. This product has fixed output voltage from 1.0V to 4.0V(accuracy: 2.0%) in increments of 0.05V. During stand-by, all circuits are shutdown to reduce consumption to as low as 0.1 A(TYP.) or less. With the built-in UVLO (Under Voltage Lock Out) function, the internal P-channel MOS driver transistor is forced OFF when input voltage gets lower than UVLO detection voltage. Besides, XC9265 series has UVLO release voltage of 1.8V (Typ.). The product with CL discharge function can discharge CL capacitor during stand-by mode due to the internal resistance by turning on the internal switch between V -GND. This enables output voltage restored to GND level fast. OUT FEATURES APPLICATIONS Input Voltage Range : 2.0V~6.0V Wearable Devices Output Voltage Setting : 1.0V~4.0V (2.0%, 0.05V increments) Smart meters Output Current : 200mA (XC9265A/C) 50mA (XC9265B/D) Bluetooth units Driver Transistor : 0.4 (Pch Driver Tr) Energy Harvest devices 0.4 (Nch Synchronous rectifier Switch Tr) Backup power supply circuits Supply Current : 0.50A VOUT(T)=1.8V (TYP.) Portable game consoles Control Method : PFM control High Speed Transient : 50mV (VIN=3.6V, VOUT=1.8V, IOUT=10A50mA) Devices with 1 Lithium cell PFM Switching Current : 330mA (XC9265A/C), 180mA (XC9265B/D) Function : Short Protection CL Discharge (XC9265C/ D) UVLO Ceramic Capacitor Compatible Operation Ambient Temperature : -40 ~ 85 Package : SOT-25, USP-6EL Environmentally Friendly : EU RoHS compliant, Pb Free TYPICAL PERFORMANCE TYPICAL APPLICATION CIRCUIT CHARACTERISTICS Efficiency vs. Output Current XC 9 2 6 5 B 1 8 1 x=1R -G. 8 V)(V O U T L =1H0( V L F 3 0 2 5 1=210MF(L- M1K10070BJ1M06)MA, ),C IN C =22F(JMK107BJ226MA) L L V IN V OUT 100 VL INX 80 C IN C L (Ceramic) V CEOUT (Ceramic) VIN=4.2V 60 V =3.6V GND IN V =2.7V IN 40 20 0 0.01 0.1 1 10 100 Out pu t COurU T(mre A)nt : I 1/32 Ef f ic ie nc y : EF F I (%) XC9265 Series BLOCK DIAGRAM XC9265A / XC9265B Type PFM Comparator Unit V OUT CFB RFB1 Short Current protection Sense PFM R FB2 Comparator FB - + PFM Controller Synch Buffer L X CE CE Controller Logic V Driver REF V DD GND UVLO V IN V start up IN Controller * Diodes inside the circuit are an ESD protection diode and a parasitic diode. XC9265C / XC9265D Type PFM Comparator Unit V OUT C R FB FB1 Short Current protection Sense C L Discharge PFM R FB2 Comparator FB - + PFM Controller Synch Buffer L X CE CE Controller Logic V Driver REF V DD GND UVLO V IN V start up IN Controller * Diodes inside the circuit are an ESD protection diode and a parasitic diode. 2/32