ME2180A28PG

ME2180 High Efficiency ,synchronous PFM step-up DC-DC converter General Description Features ME2180 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 2.5~5.0V and maximum frequency is 250KHz(TYP.). A low ripple, high efficiency step-up DC/DC converter can be constructed of ME2180Xxx with only two external components. ME2180Xxx is suitable for use with battery-powered instruments with low noise and low supply current. Selection Guide         High efficiency：95% Maximum frequency：250KHz Low Quiescent Current：15uA Input Voltage: 0.9V~5.0V Output Voltage Range:2.5V to 5.0V High Accuracy:± 2% Low ripple and Low noise Package :SOT89-3 ，SOT23-3 ，TO-92， SOT23-5 Typical Application   Power source for battery-powered equipment Power source for Wireless mouse,toys, Cameras, VCRs, PDAs, MP3, and Led lighting etc Typical Application Circuit V5.0 www.microne.com.cn Page 1 of 8 ME2180 Pin Configuration Pin Assignment SWITCHING TYPE POSTFIX PACKAGE CE FUNCTION FEATURES Build in Transistor No Lx Build in Transistor Yes LX+CE TRANSISTOR ME2180Axx ME2180Cxx M3 SOT23-3 P SOT89-3 T TO92 M5 SOT23-5 ME2180AXX Pin Number Pin Name Description SOT89-3 SOT23-3 TO-92 1 1 1 GND Ground 2 3 2 VOUT Voltage output 3 2 3 LX Switch pin ME2180AXX-DS Pin Name Description 1 GND Ground 2 VOUT Voltage output 3 LX Switch pin Pin Name Function 1 CE Chip enable 2 VOUT Output voltage monitor, IC internal power supply 3 NC 4 GND Ground 5 LX Switch Pin Number SOT23-3 ME2180CXX PIN Number SOT23-5 V5.0 NC www.microne.com.cn Page 2 of 8 ME2180 Absolute Maximum Ratings Parameter Symbol Ratings Units Supply Voltage Vmax 8 V LX pin current ILXmax 1000 mA SOT23 PD 300 mW SOT89 PD 500 mW TO92 PD 500 mW Operating Temperature Range TOPR －20～＋85 ℃ Storage Temperature Range TSTG －40~125 ℃ ESD Vesd 2000 V Continuous Total Power Dissipation Block Diagram Electrical Characteristics TA=250C, Vin=Vout×0.6V, L=22uH，Cin=10u，Cout=47u, unless otherwise noted. ME2180Axx/Cxx Symbol Parameter VOUT Test Conditions MIN TYP MAX UNIT Output Voltage Vout×0.98 Vout Vout×1.02 V Vin Supply Voltage 0.9 5 V Vstart Start voltage Iload=1mA，Vin：0→2V 0.95 V Vhold Hold voltage Iload=1mA，Vin：2→0V Fosc oscillation frequency 250 η Efficiency 90 95 % Ilimit Current limit 1000 1200 mA Iin Quiescent Current 0.5 800 V KHz 15 uA Note：1、Inductor：22μH（r