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ZXSC300 Datasheet(PDF) 1 Page - Zetex Semiconductors |
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ZXSC300 Datasheet(HTML) 1 Page - Zetex Semiconductors |
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1 / 12 page  1 ZXSC300 DESCRIPTION The ZXSC300 is a single or multi cell LED driver designed for applications where step-up voltage conversion from very low input voltages is required. These applications mainly operate from single 1.5V or 1.2V battery cells. The circuit generates constant current pulses that are ideal for driving single or multiple LED’s over a wide range of operating voltages. The ZXSC300 is a PFM controller IC that drives an external Zetex switching transistor with a very low saturation resistance. These transistors are the best switching devices available for this type of switching conversion enabling high efficiency conversion with input voltages below 1 volt. The drive output of the ZXSC controller generates a dynamic drive signal for the switching transistor. The circuit can start up under full load and operates down to an input voltage of 0.8 volts. The solution configuration ensures optimum efficiency over a wide range of load currents, several circuit configurations are possible depending on battery life versus brightness considerations. The ZXSC300 is offered in the SOT23-5 package which, when combined with a SOT23 switching transistor, generates a high efficiency small size circuit solution. The IC and discrete combination offers the ultimate cost vs performance solution for single cell LED driving applications. SINGLE OR MULTI CELL LED DRIVER SOLUTION FEATURES • 94% efficiency • Minimum operating input voltage 0.8V • Fixed output current • Low saturation voltage switching transistor • SOT23-5 package Q1 FMMT617 R1 0.33R L1 100µH VBATT LED1 WHITE LED Vcc Gnd Isense Vdrive U1 ZXSC300 TYPICAL APPLICATION CIRCUIT ISSUE 1 - JUNE 2001 ORDERING INFORMATION DEVICE Package Partmarking ZXSC300E5 SOT23-5 C300 |
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Similar Description - ZXSC300 |
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