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| 4. Pin Function Description 1.General Description MDT7727 ST MDT7727 is a step-up DC/DC converter . It has low start-up oltage and a high output v oltage accuracy ith low ripple. v w 1 VSS 2 VOUT 3 LX 2. Features MDT7727ST23 VOUT 3 igh output oltage accuracyG-/+ 2.5% H v Low start-up voltage: 0.75V (Typ.) igh eficiency: 85% Tp.) H f (y 1 VSS 2 LX 3. Applications Cellular phones, pagers, mcu Power ailure etection f d Portable / BatteryPowered Equipment Palmtops RF eoard / Mouse K by Pin Name VSS LX VOUT I/O Ground Function Open Switching pin Drain Input Output voltage monitor, IC internal power supply ORDERING INFORMATION Device MDT7727ST MDT7727ST23 ackage P SOT89 SOT23 This specification are subject to be changed without notice. Any latest information please preview P.1 2006/11 http;//www.mdtic.com.tw Ver 1.1 5. Electrical Characteristics Parameter Output Voltage Output Ripple Vin Vstart Vhold Iin Supply Current IDD1 Test Conditions Min. ---------------2.6325 ------------------------------Iout=1mA Iout=30mA Iout=1mA 0.7 Iout=30mA 1 Without loading VIN=VOUT x 0.95 Measured at VOUT pin without external component VIN=VOUT+0.5V Measured at VOUT pin without external component VCE=0 , VIN=VOUTx0.95 VIN=6V VIN=VOUT0.95 Measured at ETR pin 70 VIN=VOUT_0.95 Measured at ETR pin L , SD , CL etc. connected Typ. 2.7 2.5 0.75 1.1 Max. 2.7675 3 6 0.8 1.2 Unit V % V V V V V uA uA 20 45 25 52 Supply Current IDD2 8 12 uA Shutdown Current LX Leakage Current Maximum Oscillator Frequency Oscillator Duty Cycle 200 75 85 0.5 1 230 80 uA uA kHz % % Efficiency +2.7V Output Type VIN=VOUTx0.6 ; IOUT=30mA ; Ta=25J (Unless otherwise specified) Note: " Supply current 1 " is the supply current while the oscillator is continuously oscillating. In actual operation the oscillator periodically operates. The current actually provided by an external VIN source from VOUT pin. " Supply current 2 " is the supply current while the oscillator stop oscillating. In actual operation the oscillator periodically operates. The current actually provided by an external VIN source from VOUT pin This specification are subject to be changed without notice. Any latest information please preview P.2 2006/11 http;//www.mdtic.com.tw Ver 1.1 6.Application Circuit & Block Diagram EXTERNAL COMPONENT : Cin=100uF ; CL=100uF ; Cb=0.1uF L=100uH This specification are subject to be changed without notice. Any latest information please preview P.3 2006/11 http;//www.mdtic.com.tw Ver 1.1 7.TYPICAL PERFOMACE OF EFFICIENCY EFFICIEN CY 100 90 0 8 70 60 50 0 4 30 20 10 0 5 10 15 20 25 30 35 4 0 4 5 50 55 60 65 70 75 8 0 8 5 90 95 100 mA 2.0V 1.8V 1.5V 1.2V 0.9V 8. OUTPUT VOLTAGE V.S LOADING LOADING .s OUTPUT VOLTAGE v 3.1 2.6 2.0V 2.1 V 1.6 1.1 .6 0 10 20 30 40 50 mA This specification are subject to be changed without notice. Any latest information please preview P.4 2006/11 http;//www.mdtic.com.tw % 1.8V 1.5 1.2V .V 09 60 70 80 09 100 Ver 1.1 |
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