ME2108A30PG

DC/DC Step up Converter ME2108 Series Ver 09 DC/DC Step up 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 l l l l l 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%(Type) PACKAGE：SOT-23，SOT-23-3，SOT-89-3， SOT-89-5 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. l l l l 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. Selection Guide： Applications： l l l Nanjing Micro One Electronics Inc. 1/14 Power source for battery-powered equipment 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 TEL: 025-84731186 www. microne. com. cn DC/DC Step up Converter ME2108 Series Ver 09 TYPE ME2108Axx ME2108Bxx ME2108Cxx ME2108Dxx ME2108Dxx POSTFIX PACKAGE M3 P M3 P M5 P M5 P SOT-23-3 SOT-89-3 SOT-23-3 SOT-89-3 SOT-23-5 SOT-89-5 SOT-23-5 SOT-89-5 M5 SOT-23-5 SWITCHING TRANSISTOR Build in Transistor External Transistor Build in Transistor External Transistor External Transistor CE FUNCTION FEATURES No Lx No Ext Yes Lx CE Yes Ext CE Yes Ext Pin Configuration： Pin Assignment： ME2108Axx PIN Number SOT-23-3/ SOT-23 SOT-89-3 1 1 3 2 2 3 ME2108Bxx PIN Number SOT-23-3/ SOT-23 SOT-89-3 1 1 3 2 2 3 ME2108Cxx PIN Number SOT-23-5 SOT-89-5 4 5 2 2 5 4 1 3 3 1 Nanjing Micro One Electronics Inc. PIN NAME Vss Vout Lx PIN NAME Vss Vout Ext PIN NAME Vss Vout Lx CE NC 2/14 FUNCTION Ground Output voltage monitor, IC internal power supply Switch FUNCTION Ground Output voltage monitor, IC internal power supply External switch transistor drive FUNCTION Ground Output voltage monitor, IC internal power supply Switch Chip enable NC TEL: 025-84731186 www. microne. com. cn DC/DC Step up Converter ME2108 Series Ver 09 ME2108Dxx PIN Number SOT-23-5 SOT-89-5 4 5 2 2 5 4 1 3 3 1 ME2108Fxx PIN Number SOT-23-5 1 2 3 4 5 PIN NAME FUNCTION Vss Vout Ext CE NC Ground Output voltage monitor, IC internal power supply External switch transistor drive Chip enable NC PIN NAME FUNCTION FB Vdd NC Vss EXT Feed Back Output voltage monitor, IC internal power supply NC Ground External switch transistor drive Block Diagram： Absolute Maximum Ratings： PARAMETER VIN Input Voltage Lx Pin voltage EXT Pin voltage CE Pin voltage Lx Pin current EXT Pin current Vdd input voltage Continuous Total SOT-23 Power Dissipation SOT-89 Operating Ambient Temperature Storage Temperature Soldering temperature and time Nanjing Micro One Electronics Inc. SYMBAL VIN VLX VEXT VCE ILX IEXT Vdd RATINGS 6.5 6.5 -0.3~Vout+0.3 -0.3~Vout+0.3 600 ±30 6.5 UNITS V V V V mA mA V Pd 300 mW Pd TOpr Tstg Tsolder 500 -25~+85 -40~+125 260℃, 10s mW ℃ ℃ 3/14 TEL: 025-84731186 www. microne. com. cn DC/DC Step up Converter ME2108 Series Ver 09 Electrical Characteristics： Measuring conditions：Unless otherwise specified , VIN=Vout*0.6，VSS=0V，IOUT=10mA，Topt=25℃。 ME2108Axx/Cxx Fosc=180kHz SYMBOL PARAMETER VOUT Output Voltage Vstart Vhold IDD1 IDD2 ILX ILXleak Fosc Oscillation Start-up Voltage Oscillation Hold Voltage Supply Current 1 Supply Current 2 Lx Switching Current Lx Leakage Current Oscillation Frequency Maxdty Duty Ratio EFFI Efficiency ME2108Bxx/Dxx PARAMETER VOUT Output Voltage Oscillation Start-up Voltage Vhold IDD1 IDD2 ILX ILXleak Fosc MIN TYP MAX UNITS Vout*0.975 Vout Vout*1.025 V 0.8 0.9 V IOUT=1mA， VIN：0→2V IOUT=1mA， VIN：2→0V No external component Vout=Vout*0.95, 0.45 V 50 µA Vout=Vout+0.5V 9 µA VLX=0.4V, Vout=Vout*0.95 360 mA Vout=VLX=6V 0.5 µA Vout=set Vout*0.95 180 kHz on(VLX“L”)side 84 % 85 % Fosc=180kHz SYMBOL Vstart CONDITIONS Oscillation Hold Voltage Supply Current 1 Supply Current 2 Lx Switching Current Lx Leakage Current Oscillation Frequency Maxdty Duty Ratio EFFI Efficiency Nanjing Micro One Electronics Inc. CONDITIONS MIN TYP MAX UNITS Vout*0.975 Vout Vout*1.025 V 0.8 0.9 V IOUT=1mA， VIN：0→2V IOUT=1mA， VIN：2→0V No external component Vout=Vout*0.95, 0.45 V 80 µA Vout=Vout+0.5V 12 µA VLX=0.4V, Vout=Vout*0.95 360 mA Vout=VLX=6V 0.5 µA Vout=set Vout*0.95 180 kHz on(VLX“L”)side 84 % 85 % 4/14 TEL: 025-84731186 www. microne. com. cn DC/DC Step up Converter ME2108 Series Ver 09 ME2108F SYMBOL VFB Vstart Vhold IDD1 IDD2 ILX ILXleak Fosc VFB=3.3V , Fosc=180kHz PARAMETER Output Feedback Voltage Oscillation Start-up Voltage Oscillation Hold Voltage Supply Current 1 Supply Current 2 Lx Switching Current Lx Leakage Current Oscillation Frequency Maxdty Duty Ratio CONDITIONS MIN TYP MAX UNITS 3.22 3.3 3.38 V 0.8 0.9 V IOUT=1mA， VIN：0→2V IOUT=1mA， VIN：2→0V No external component Vout=Vout*0.95, 0.45 V 80 µA Vout=Vout+0.5V 10 µA VLX=0.4V, Vout=Vout*0.95 360 mA Vout=VLX=6V 0.5 µA Vout=set Vout*0.95 180 kHz on(VLX“L”)side 84 % EFFI Efficiency Note：1、Diode use Schottky diode such as IN5817 or 2、Inductor：33μH（r