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| 1.General Description 4. Pin Function Description MDT7730 is a step-up DC/DC converter . It has low start-up voltage and a high output voltage accuracy with low ripple. MDT7730 1 2 VOUT 3 LX 2. Features VSS High output voltage accuracy+/- 2.5% Low start-up voltage: 0.75V (Typ.) High efficiency: 85% (Typ.) Pin Name I/O Function Ground 3. Applications LX VOUT Open Switching pin Drain Input Output voltage monitor, IC internal power supply Cellular phones, pagers, mcu Power failure detection Portable / Battery-Powered Equipment Palmtops RF Keyboard / Mouse ORDERING INFORMATION Device MDT7730ST Package SOT89 1 of 4 2005/10/18 5. Electrical Characteristics Parameter Output Voltage Output Ripple Vin Vstart Vhold Iin Supply Current IDD1 Supply Current IDD2 Shutdown Current LX Leakage Current Maximum Oscillator Frequency Oscillator Duty Cycle Test Conditions Min. ---------------2.925 ------------------------------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. 3 2.5 0.75 1.1 20 45 8 Max. 3.075 3 6 0.8 1.2 25 52 12 0.5 1 230 80 Unit V % V V V V V uA uA uA uA uA kHz % % 200 75 85 Efficiency +3.0V Output Type VIN=VOUTx0.6 ; IOUT=30mA ; Ta=25 (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 2 of 4 2005/10/18 6.Application Circuit EXTERNAL COMPONENT : Cin=100uF ; CL=100uF ; Cb=0.1uF L=100uH 7.TYPICAL PERFOMACE OF EFFICIENCY EFFICIENCY 100 90 80 70 60 50 40 30 20 10 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 mA 2.0V 1.8V 1.5V 1.2V 0.9V % 3 of 4 2005/10/18 8. OUTPUT VOLTAGE V.S LOADING OUTPUT VOLTAGE V.S OUTPUT CURRENT 3 2.5 V 2 1.5 1 10 20 30 40 50 mA 60 70 80 90 100 2.0V 1.8V 1.5V 1.2V 0.9 4 of 4 2005/10/18 |
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