MDT763320 Step-up DC/DC Converter with Voltage Detector 4. Pin Function Description 1.General Description MDT763320 MDT763320 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 (2.0v). VSS 1 8 LX CP 2 7 ETR VDET 3 VIN 4 Pin Name 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.) ● ● ● ● ● Cellular phones, pagers, mcu Power failure detection Portable / Battery-Powered Equipment Palmtops RF Keyboard / Mouse External capacitor for adjusting VDET output delay time VDET Open Supply voltage Drain detector. Output low if Vin < 2.0V. VIN Input Supply voltage input Open Switching pin Drain Output External switch transistor drive LX 3. Applications Function ETR CE Input Chip enable pin, high active VOUT Input Output voltage monitor, IC internal power supply ORDERING INFORMATION Device Package MDT763320P DIP MDT763320S SOP 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 MDT763320 Step-up DC/DC Converter with Voltage Detector 5. Electrical Characteristics 0.75 1 Max. 3.375 ±3 6 0.8 1.2 20 45 25 52 Unit V % V V V V V uA uA 8 12 uA 200 0.5 1 230 uA uA kHz 75 80 % 1.9 2.0 2.1 Low Battery Detect Voltage (LBDV) 0.1 LBDV hysteresis -----------------Width 85 Efficiency L , SD , CL etc. connected +3.3V Output Type VIN=VOUT×0.6 ; IOUT=30mA ; Ta=25℃ (Unless otherwise specified) V 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 ---------------------------------------------Iout=1mA Iout=30mA Iout=1mA Iout=30mA Without loading VIN=VOUT × 0.95 Measured at VOUT pin without external component VIN=VOUT+0.5V Measured at VOUT pin without external component VCE=0 , VIN=VOUT×0.95 VIN=6V VIN=VOUT0.95 Measured at ETR pin VIN=VOUT_0.95 Measured at ETR pin VIN: HI to LOW Min. 3.225 Typ. 3.3 ±2.5 0.7 0.9 70 V % 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 MDT763320 Step-up DC/DC Converter with Voltage Detector 6.Application Circuit & Block Diagram 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 MDT763320 Step-up DC/DC Converter with Voltage Detector 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) This specification are subject to be changed without notice. Any latest information please preview P.4 2006/11 http;//www.mdtic.com.tw Ver 1.1 MDT763320 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 V LOADING v.s OUTPUT VLOTAGE 3.5 3.25 3 2.75 2.5 2.25 2 1.75 1.5 1.25 1 2.0V 1.8V 1.5 1.2 0.9V 10 20 30 40 50 60 70 80 90 100 mA This specification are subject to be changed without notice. Any latest information please preview P.5 2006/11 http;//www.mdtic.com.tw Ver 1.1