データシートサーチシステム |
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LM2623 データシート(PDF) 9 Page - Texas Instruments |
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LM2623 データシート(HTML) 9 Page - Texas Instruments |
9 / 22 page LM2623 www.ti.com SNVS188H – MAY 2004 – REVISED NOVEMBER 2014 Device Functional Modes (continued) and smaller inductors reduce the ripple in these situations. The frequency being filtered, however, is not the basic switching frequency. It is a lower frequency determined by the load, the input/output voltage and the circuit parameters. This mode of operation is useful in situations where the load variation is significant. Power managed computer systems, for instance, may vary from zero to full load while the system is on and this is usually the preferred regulation mode for such systems. 7.4.2 Low Voltage Start-Up The LM2623 can start up from voltages as low as 1.1 V. On start-up, the control circuitry switches the N-channel MOSFET continuously until the output reaches 3 V. After this output voltage is reached, the normal step-up regulator feedback and gated oscillator control scheme take over. Once the device is in regulation, it can operate down to below 0.8 V input, since the internal power for the IC can be boot-strapped from the output using the VDD pin. Copyright © 2004–2014, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: LM2623 |
同様の部品番号 - LM2623_15 |
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同様の説明 - LM2623_15 |
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