XC9140 Series ETR04015-007a Step-Up Synchronous PFM DC/DC Converter Green Operation Compatible GENERAL DESCRIPTION The XC9140 series are step-up synchronous DC/DC converters that support ceramic capacitors and have an internal 0.6 (TYP.) Nch driver transistor and an internal 0.65 (TYP.) Pch synchronous rectifier switch transistor. PFM control enables a low quiescent current, making these products ideal for portable devices that require high efficiency. When the output voltage is 3.3V and the load current is 1mA, startup from an input voltage of VIN = 0.9V is possible which means that these products can be used in applications that start using a single alkaline or nickel-metal hydride battery. The output voltage can be s et from 1.8V to 5.0V (2.0%) in steps of 0.1V. A version with a UVLO (Under Voltage Lock-out) function is also available. This function enables the prevention of battery leakage by stopping ICs operation when the input voltage is low. The standard product has a UVLO release voltage of 1.65V, 2.15V and a custom version with a release voltage selectable from between 1.65V to 2.2V, in steps of 0.05V, is also available. FEATURES APPLICATIONS Input Voltage Range : operating hold voltage 0.7V ~ 5.5V Mouses, Keyboards Start-up voltage 0.9V ~ 5.5V Bluetooths Household use Medical equipments Output Voltage Setting : 1.8V ~ 5.0V (2.0%) 0.1V increments Remote controls Output Current : 100mAV =3.3V, V =1.8V (TYP.) OUT BAT Game consoles Driver Transistor : 0.6 Nch driver transistor Devices with 1~3 Alkaline, 1~3 Nickel Hydride, 0.65 Pch synchronous rectifier switch transistor 1 Lithium and 1 Li-ion Supply Current : 6.3A (V =V +0.5V) BAT OUT Control Method : PFM Control High speed transient response : 50mV V =3.3V, V =1.8V, I =150mA OUT BAT OUT PFM Switching Current : 350mA Load Disconnection (A,B Type) Functions : Bypass Mode (C Type) C discharge (B Type), UVLO L Output Capacitor Ceramic Capacitor : -40 ~ 85 Operating Ambient Temperature Packages : SOT-25, USP-6EL Environmentally Friendly : EU RoHS Compliant, Pb Free TYPICAL APPLICATION CIRCUIT TYPICAL PERFORMANCE CHARACTERISTICS Efficiency vs. Output Current XC9140A331MR-G(VOUT=3.3V) L=4.7H(VLF302512M-4R7M),CIN=4.7F(LMK107BJ475MA), CL=10F(LMK107BJ106MA) 100 L=4.7 H 2.5V VOUT LX 80 CL=10F 3.0V V =1.8V BAT 60 CE 40 VIN=0.95.5V VBAT GND 20 C =4.7 F IN CIN=10 F 0 0.01 0.1 1 10 100 1000 Output Current : I (mA) OUT 1/32 Efficiency : EFFI (%) XC9140 Series BLOCK DIAGRAM XC9140Axx1/XC9140Cxx1 Type L X PFM C R FB FB1 Parasitic Diode Controller V OUT Current Sense V OUT R PFM FB2 Comparator FB - Buffer PFM Controller Driver + GND and Inrush Currrent V OUT V REF Protection V V V Detector DD BAT OUT CE and Bypass CE Controller Logic V BAT * Diodes inside the circuit are an ESD protection diodes and a parasitic diodes. XC9140Bxx1 Type L X PFM C R FB FB1 Parasitic Diode Controller VOUT Current Sense V OUT R PFM FB2 CL Comparator Auto Discharge FB - Buffer PFM Controller Driver + GND and Inrush Currrent V OUT VREF Protection V V V Detector DD BAT OUT CE and Bypass CE Controller Logic V BAT * Diodes inside the circuit are an ESD protection diodes and a parasitic diodes. 2/32