ME2108A50M3G

ME2108 8 Series ME2108 PFM Step-up DC/DC Converter, ME210 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. � � � � � Selection Guide Typical Application � � � � � 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 � V10.0 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：SOT23、SOT89、TO92 1 ME2108 Pin Configuration Pin Assignment TYPE POSTFIX PACKAGE M3 SOT23-3 P SOT89-3 T1 TO92 M3 SOT23-3 P SOT89-3 M5 SOT23-5 P SOT89-5 M5 SOT23-5 P SOT89-5 M5 SOT23-5 ME2108Axx ME2108Bxx ME2108Cxx ME2108Dxx ME2108F SWITCHING TRANSISTOR CE FUNCTION FEATURES Build in Transistor No Lx External Transistor No Ext Build in Transistor Yes Lx CE External Transistor Yes Ext CE External Transistor Yes Ext ME2108AXX PIN Number Pin Name Function 1 Vss Ground 2 3 Vout 3 2 Lx Switch Pin Name Function Ground SOT23-3 SOT89-3 TO92 1 1 3 2 ME2108BXX PIN Number SOT23-3 SOT89-3 1 1 Vss 3 2 Vout 2 3 Ext V10.0 Output voltage monitor, IC internal power supply Output voltage monitor, IC internal power supply External switch transistor drive 2 ME2108 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 Pin Name Function SOT23-5 SOT89-5 4 XX ME2108DXX ME2108D PIN Number Output voltage monitor, IC internal power supply SOT23-5 SOT89-5 4 5 Vss Ground 2 2 Vout Output voltage monitor, IC internal power supply 5 4 Ext External switch transistor drive 1 3 CE Chip enable 3 1 NC NC 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 V10.0 3 ME2108 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 Block Diagram V10.0 4 ME2108 Electrical Characteristics Measuring conditions：Unless otherwise specified , VIN=Vout×0.6，VSS=0V，IOUT=10mA，Topt=25℃。 ME2108Axx/Cxx Fosc=180kHz SYMBOL 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 % 85 % EFFI ME2108Bxx/Dxx 0.5 Efficiency µA Fosc=180kHz 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 % SYMBOL PARAMETER VOUT Output Voltage Vstart Oscillation Start-up Voltage Vhold V10.0 CONDITIONS 0.5 µA 5 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