ZXSC100X8 Obsolete Closest Alternative is ZXSC100N8 ZXSC100 SINGLE CELL DC-DC CONVERTER SOLUTION Description Pin Assignments SO-8 The ZXSC100 series is designed for DC-DC applications where step-up voltage conversion from very low input voltages is required. These applications mainly operate from single nickel cadmium or nickel metal hydride battery cells. The circuit can start up under full load with regulation maintained down to an input voltage of only 0.926 volts. The solution configuration ensures optimum efficiency over a wide range of load currents. Several circuit configurations are possible with loads up to 2W. The step up output voltage is easily programmed with external resistors. With its non- synchronous architecture an output voltage down to the input voltage level can be achieved. For best performance the ZXSC100 quiescent current is a small 150 A ensuring minimum battery drain in no load conditions. The IC and discrete combination offers the ultimate cost vs. performance solution for single cell DC-DC conversion. Features Applications Efficiency maintained over a wide range of input Cordless telephones voltages and load currents 82% efficiency V = 1V MP3 players BATT Startup under full load PDA Pagers Minimum operating input voltage V = 0.926V BATT Battery backup supplies Adjustable output voltage down to V BATT Electronic toothbrush Quiescent current typically 150A referred to input GPS receivers voltage Digital camera SO-8 package in Green Molding Compound (No Br, Sb) with lead Free Finish/RoHS Compliant (Note 1) Palmtop computers Notes: 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS Hand held instruments exemptions applied. Please visit our website at: Portable medical equipment ZXSC100X8 Obsolete Closest Alternative is ZXSC100N8 ZXSC100 SINGLE CELL DC-DC CONVERTER SOLUTION Pin Descriptions Pin No. Name Description Emitter of internal drive transistor. Connect to RE in lower power applications. Must be 1 EM unconnected in higher power applications. Only used if increased drive current to the main external NPN switching transistor is required. 2 BAS (See Note 2). Drive current sense input. Internal threshold voltage set 25mV below V . Connected external CC 3 RE sense resistor. (Note 2) 4 V Supply voltage, generally NiMH, NiCd single cell. CC Inductor current sense input. Internal threshold voltage set to 25mV. Connect external sense 5 I SENSE resistor. Feedback sense. Internal threshold set to 730mV. Connect external resistive divider to output 6 FB voltage. 7 GND Ground Drive output for external switching transistor. 8 V DRIVE Connect to base of external bipolar transistor. For increased drive current see Note 2 Note: 2. In higher load current applications an additional PNP can be used to increase the drive current of the main external NPN switching transistor. The PNP base should be connected to BAS pin, its emitter to the RE pin and its collector connected to V pin. DRIVE Functional Block Diagram Absolute Maximum Ratings Description Rating Unit Supply Voltage 0.3 to 3.5 V Maximum Voltage Other Pins 0.3 to V +0.3 V CC Power Dissipation (25C) SO-8 780 mW Operating Temperature 0 to 70 C Storage Temperature -55 to +150 C Junction Temperature 150 C 2 of 13 January 2012 ZXSC100 www.diodes.com Diodes Incorporated Document number: DS33613 Rev. 6 - 2