ME2108A28M3G

ME2108 PFM Step-up DC/DC Converter, ME2108 Series General Description Features ME2108 Series is a PFM Step-up DC/DC converter IC with low supply current by CMOS process. High frequency noise that occurs during switching is reduced by using advanced circuit designed, output voltage is programmable in 0.1V steps between 2.0~7.0V and maximum frequency is 180KHz(TYP.). A low ripple, high efficiency step-up DC/DC converter can be constructed of ME2108Xxx with only three external components. Also available is a CE(chip enable) function that reduce power dissipation During shut-down mode. ME2108Xxx is suitable for use with battery-powered instruments with low noise and low supply current. Typical Application Low ripple and low noise Operating voltage range：0.9V~6.5V Output voltage range：2.0V~7.0V(step 0.1V) Output voltage accuracy：±2.5% Output Current：If VIN=3.0V and VOUT=5.0V,then IOUT=400mA Low start voltage：≤0.9V(at IOUT =1mA) Maximum oscillator frequency：180KHz(TYP.) High Efficiency：85%(TYP.)         Package  Power source for battery-powered equipment  3-pin: SOT23-3、SOT89-3、TO92  Power source for wireless mouse, wireless keyboard, toys, cameras, camcorders, VCRs, PDAs, and hand-held communication equipment Power source for appliances which require higher cell voltage than that of batteries used in the appliances  5-pin: SOT23-5  V12.0 www.microne.com.cn 1/14 ME2108 Typical Applications For use build in transistor For use external transistor For use chip enable For use external transistor&chip enable Components：  Inductor：33uH(Sumida )  Diode：IN5817、IN5819  Capacitor：47uF/16V(Tantalum Capacitor)  NMOS：MEM2302、AAT9460、XP151、XP161 V12.0 www.microne.com.cn 2/14 ME2108 Selection Guide ME 21 08 X X X X X G Environment mark Package: P-SOT89-3 M5-SOT23-5 Output Voltage Function Product Type Product Series Microne Product series Switch Transistor CE Function Featutes Voltage Package ME2108A28PG Build in Transistor No Lx 2.8 SOT89-3 ME2108A30M3G Build in Transistor No Lx 3.0 SOT23-3 ME2108A33TG Build in Transistor No Lx 3.3 TO-92 ME2108B33M3G External Transistor No Ext 3.3 SOT23-3 ME2108C36M5G Build in Transistor Yes Lx 3.6 SOT23-5 ME2108D50M5G External Transistor Yes Ext 5.0 SOT23-5 ME2108F33M5G External Transistor Yes Ext 3.3 SOT23-5 NOTE: V12.0 At present ,there are five kinds of voltage value: 2.7V、2.8V、3.0V、3.3V、3.6V、4.0V、5.0V、5.6V。 If you need other voltage and package, please contact our sales staff。 www.microne.com.cn 3/14 ME2108 Pin Configuration ME2108AXX PIN Number Pin Name Function 1 Vss Ground 2 3 Vout 3 2 Lx SOT23-3 SOT89-3 TO92 1 1 3 2 Output voltage monitor, IC internal power supply Switch ME2108BXX PIN Number Pin Name Function 1 Vss Ground 3 2 Vout 2 3 Ext SOT23-3 SOT89-3 1 Output voltage monitor, IC internal power supply External switch transistor drive ME2108CXX PIN Number Pin Name Function 5 Vss Ground 2 2 Vout 5 4 Lx Switch 1 3 CE Chip enable 3 1 NC NC SOT23-5 SOT89-5 4 Output voltage monitor, IC internal power supply ME2108DXX PIN Number SOT23-5 Pin Name Function 4 Vss Ground 2 Vout Output voltage monitor, IC internal power supply 5 Ext External switch transistor drive 1 CE Chip enable 3 NC NC V12.0 www.microne.com.cn 4/14 ME2108 ME2108F PIN Number Pin Name Function 1 FB Feed Back 2 Vdd Output voltage monitor, IC internal power supply 3 NC NC 4 Vss Ground 5 EXT External switch transistor drive SOT23-5 Block Diagram Absolute Maximum Ratings PARAMETER SYMBAL RATINGS UNITS VIN Input Voltage VIN 6.5 V Lx Pin voltage VLX 6.5 V EXT Pin voltage VEXT -0.3~Vout+0.3 V CE Pin voltage VCE -0.3~Vout+0.3 V Lx Pin current ILX 600 mA EXT Pin current IEXT ±30 mA Vdd input voltage Vdd 6.5 V SOT23 Pd 300 mW SOT89 Pd 500 mW TO92 Pd 500 mW Operating Ambient Temperature TOpr -25~+85 ℃ Storage Temperature Tstg -40~+125 ℃ Soldering temperature and time Tsolder 260℃, 10s Continuous Total Power Dissipation V12.0 www.microne.com.cn 5/14 ME2108 Electrical Characteristics Measuring conditions：Unless otherwise specified , VIN=Vout×0.6，VSS=0V，IOUT=10mA，Topt=25℃。 ME2108Axx/Cxx SYMBOL Fosc=180kHz PARAMETER CONDITIONS MIN TYP MAX UNITS Vout× 0.975 Vout Vout× 1.025 V 0.9 V VOUT Output Voltage Vstart Oscillation Start-up Voltage IOUT=1mA， VIN：0→2V 0.8 Vhold Oscillation Hold Voltage IOUT=1mA， VIN：2→0V 0.45 V IDD1 Supply Current 1 No external component Vout=Vout×0.95, 50 µA IDD2 Supply Current 2 Vout=Vout+0.5V 9 µA ILX Lx Switching Current VLX=0.4V, Vout=Vout×0.95 360 mA ILXleak Lx Leakage Current Vout=VLX=6V Fosc Oscillation Frequency Vout=set Vout×0.95 180 kHz Maxdty Duty Ratio on(VLX“L”)side 84 % EFFI Efficiency 85 % ME2108Bxx/Dxx 0.5 µA Fosc=180kHz SYMBOL PARAMETER VOUT Output Voltage Vstart Oscillation Start-up Voltage Vhold MIN TYP MAX UNITS Vout× 0.975 Vout Vout× 1.025 V IOUT=1mA， VIN：0→2V 0.8 0.9 V Oscillation Hold Voltage IOUT=1mA， VIN：2→0V 0.45 V IDD1 Supply Current 1 No external component Vout=Vout×0.95, 80 µA IDD2 Supply Current 2 Vout=Vout+0.5V 12 µA ILX Lx Switching Current VLX=0.4V, Vout=Vout×0.95 360 mA ILXleak Lx Leakage Current Vout=VLX=6V Fosc Oscillation Frequency Vout=set Vout×0.95 180 kHz Maxdty Duty Ratio on(VLX“L”)side 84 % EFFI Efficiency 85 % V12.0 CONDITIONS 0.5 www.microne.com.cn µA 6/14 ME2108 ME2108F VFB=3.3V , Fosc=180kHz SYMBOL PARAMETER VFB Output Feedback Voltage Vstart Oscillation Start-up Voltage Vhold CONDITIONS MIN TYP MAX UNITS 3.22 3.3 3.38 V IOUT=1mA， VIN：0→2V 0.8 0.9 V Oscillation Hold Voltage IOUT=1mA， VIN：2→0V 0.45 V IDD1 Supply Current 1 No external component Vout=Vout×0.95, 80 µA IDD2 Supply Current 2 Vout=Vout+0.5V 10 µA ILX Lx Switching Current VLX=0.4V, Vout=Vout×0.95 360 mA ILXleak Lx Leakage Current Vout=VLX=6V Fosc Oscillation Frequency Vout=set Vout×0.95 180 kHz Maxdty Duty Ratio on(VLX“L”)side 84 % EFFI Efficiency 85 % 0.5 µA Note：1、Diode use Schottky diode such as IN5817 or IN5819 (forward voltage drop:0.2V) 2、Inductor：33μH（r