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LM2660MX Datenblatt(PDF) 7 Page - Texas Instruments

Teilenummer LM2660MX
Bauteilbeschribung  LM2660 Switched Capacitor Voltage Converter
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LM2660MX Datenblatt(HTML) 7 Page - Texas Instruments

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LM2660
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SNVS135D – SEPTEMBER 1999 – REVISED MAY 2013
Circuit Description
The LM2660 contains four large CMOS switches which are switched in a sequence to invert the input supply
voltage. Energy transfer and storage are provided by external capacitors. Figure 16 illustrates the voltage
conversion scheme. When S1 and S3 are closed, C1 charges to the supply voltage V+. During this time interval
switches S2 and S4 are open. In the second time interval, S1 and S3 are open and S2 and S4 are closed, C1 is
charging C2. After a number of cycles, the voltage across C2 will be pumped to V+. Since the anode of C2 is
connected to ground, the output at the cathode of C2 equals −(V+) assuming no load on C2, no loss in the
switches, and no ESR in the capacitors. In reality, the charge transfer efficiency depends on the switching
frequency, the on-resistance of the switches, and the ESR of the capacitors.
Figure 16. Voltage Inverting Principle
Copyright © 1999–2013, Texas Instruments Incorporated
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