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| 1.General Description 4. Pin Function Description MDT7733 is a step-up DC/DC converter . It has low start-up voltage and a high output voltage accuracy with low ripple. MDT7733 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 LX VOUT I/O Function Ground 3. Applications 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 MDT7733ST Package SOT89 1 of 4 2005/10/18 5. Electrical Characteristics Parameter Output Voltage Output Ripple Vin Vstart Vhold Iin Supply Current IDD1 Test Conditions Min. ---------------3.225 ------------------------------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. 3.3 2.5 0.75 1.1 Max. 3.375 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 0.5 1 230 80 uA uA kHz % % 85 Efficiency +3.3V 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 |
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