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SS6578 Datasheet(PDF) 1 Page - Silicon Standard Corp. |
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SS6578 Datasheet(HTML) 1 Page - Silicon Standard Corp. |
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1 / 11 page  www.SiliconStandard.com 1 of 11 SS6578 High-Efficiency, Step-Down DC/DC Controller FEATURES 4V to 18V input voltage operation. High-efficiency (up to 95%). Low quiescent current at 90 µA. Pulse-skipping and pulse-frequency modulation. Inputs-uncommitted current-sense comparator. Duty-cycle adjustable. 90KHz to 280KHz oscillator frequency. Power-saving shutdown mode (8 µA typical). Push-pull driver output. APPLICATIONS • Notebook 5V/3.3V Main Power • Step-Down DC/DC Controller Modules. • Constant-Current Source for Battery Chargers. DESCRIPTION The SS6578 is a high performance step-down DC/DC controller, designed to drive an external P-channel MOSFET to generate programmable output voltages. Two main schemes of Pulse-Skipping and Pulse-Frequency Modulation are employed to maintain low quiescent current and high conversion efficiency under wide ranges of input voltage and loading condition. The SS6578 delivers 10mA to 2A of output current with 87%~93% efficiency at VIN=9V, VOUT=5V condition. A current-sense comparator with both inverting and non-inverting inputs uncommitted is included to provide the crucial function of either current-limit protection or constant-output current control. When the SS6578 is used in a high-side current-sensing step-down constant-current source, the efficiency is typically greater than 90%. Duty-cycle can be adjusted to greater than 90% by connecting a resistor from DUTY pin to VIN. Quiescent current is about 90 µA and can be reduced to 8µA in shutdown mode. The switching frequency range of around 90 kHz to 280 kHz allows small size switching components, which are ideal for battery powered portable equipment. ORDERING INFORMATION PIN CONFIGURATION SO-8 TOP VIEW DRI CS+ DUTY FB CS- GND VIN SHDN 1 3 4 2 8 6 5 7 SS6578CXXX Packing TR: Tape and reel TB: Tubes Packaging S: SO-8 N: PDIP-8 Example: SS6578CSTR à in SO-8 package, shipped in tape and reel packing (PDIP-8 is only available in tubes) Rev.2.02 4/06/2004 |
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