MDT763022 Step-up DC/DC Converter with Voltage Detector 1.General Description 4. Pin Function Description MDT763022 is a step-up DC/DC converter with supply voltage detector. It has low start-up voltage and a high output voltage accuracy with low ripple. The device generates a low level signal whenever the input voltage (supply voltage) falls below threshold voltage level (2.2v). MDT763022 VSS 1 8 LX CP 2 VDET 3 VIN 4 Pin Name 7 ETR 6 CE 5 VOUT I/O VSS Ground CP I/O 2. Features ● ● ● High output voltage accuracy：+/- 2.5% Low start-up voltage: 0.75V (Typ.) High efficiency: 85% (Typ.) ● Open Supply voltage Drain detector. Output low if Vin < 2.2V. VIN Input ● ● ● ● ETR Cellular phones, pagers, mcu Power failure detection Portable / Battery-Powered Equipment Palmtops RF Keyboard / Mouse External capacitor for adjusting VDET output delay time VDET LX 3. Applications Function Supply voltage input Open Switching pin Drain Output External switch transistor drive CE Input Chip enable pin, high active VOUT Input Output voltage monitor, IC internal power supply ORDERING INFORMATION Device 1 of 4 Package MDT763022P DIP MDT763022S SOP 2005/10/18 MDT763022 Step-up DC/DC Converter with Voltage Detector 5. Electrical Characteristics Test Conditions Min. ---------------2.925 ------------------------------Iout=1mA Iout=30mA Vhold Iout=1mA 0.7 Iout=30mA 0.9 Iin Without loading Supply Current IDD1 VIN=VOUT × 0.95 Measured at VOUT pin without external component Supply Current IDD2 VIN=VOUT+0.5V Measured at VOUT pin without external component Shutdown Current VCE=0 , VIN=VOUT×0.95 LX Leakage VIN=6V Current Maximum VIN=VOUT0.95 Oscillator Measured at ETR pin Frequency Oscillator Duty VIN=VOUT_0.95 70 Cycle Measured at ETR pin Parameter Output Voltage Output Ripple Vin Vstart Typ. 3 ±2.5 0.75 1 Max. 3.075 ±3 6 0.8 1.2 20 45 25 52 Unit V % V V V V V uA uA 8 12 uA 0.5 1 uA uA 200 230 kHz 75 80 % Low Battery VIN: HI to LOW 2.1 2.2 2.3 V Detect Voltage (LBDV) LBDV hysteresis -----------------0.1 V Width 85 % Efficiency L , SD , CL etc. connected +3.0V Output Type VIN=VOUT×0.6 ; 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 MDT763022 Step-up DC/DC Converter with Voltage Detector 6.Application Circuit EXTERNAL COMPONENT : CP=22uF ; CIN=100uF ; CL=100uF ; Cb=0.1uF L=100uH ; RPU=47K External Transistor application ------using N-Channel Power MOS FET(1A) 3 of 4 2005/10/18 MDT763022 Step-up DC/DC Converter with Voltage Detector 7.TYPICAL PERFOMACE OF EFFICIENCY % EFFICIENCY 100 90 80 70 60 50 40 30 20 10 0 2.0V 1.8V 1.5V 1.2V 0.9V 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 mA 8. OUTPUT VOLTAGE V.S LOADING OUTPUT VOLTAGE V.S OUTPUT CURRENT 3 2.0V 1.8V 1.5V 1.2V 0.9 V 2.5 2 1.5 1 10 20 30 40 50 60 70 80 90 100 mA 4 of 4 2005/10/18