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LM2664M6X Datasheet(PDF) 5 Page - National Semiconductor (TI) |
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LM2664M6X Datasheet(HTML) 5 Page - National Semiconductor (TI) |
5 / 9 page Connection Diagram Ordering Information Order Number Package Number Package Marking Supplied as LM2664M6 MA06A SO3A (Note 9) Tape and Reel (1000 units/rail) LM2664M6X MA06A SO3A (Note 9) Tape and Reel (3000 units/rail) Note 9: The first letter ″S″ identifies the part as a switched capacitor converter. The next two numbers are the device number. The fourth letter ″A″ indicates the grade. Only one grade is available. Larger quantity reels are available upon request. Pin Description Pin Name Function 1 GND Power supply ground input. 2 OUT Negative voltage output. 3 CAP− Connect this pin to the negative terminal of the charge-pump capacitor. 4SD Shutdown control pin, tie this pin to V+ in normal operation, and to GND for shutdown. 5 V+ Power supply positive voltage input. 6 CAP+ Connect this pin to the positive terminal of the charge-pump capacitor. Circuit Description The LM2664 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 capaci- tors. Figure 2 illustrates the voltage conversion scheme. When S 1 and S3 are closed, C1 charges to the supply volt- age V+. During this time interval, switches S 2 and S4 are open. In the second time interval, S 1 and S3 are open; at the same time, S 2 and S4 are closed, C1 is charging C2. After a number of cycles, the voltage across C 2 will be pumped to V+. Since the anode of C 2 is connected to ground, the output at the cathode of C 2 equals −(V+) when there is no load cur- rent. The output voltage drop when a load is added is deter- mined by the parasitic resistance (R ds(on) of the MOSFET switches and the ESR of the capacitors) and the charge transfer loss between capacitors. Details will be discussed in the following application information section. Application Information Simple Negative Voltage Converter The main application of LM2664 is to generate a negative supply voltage. The voltage inverter circuit uses only two ex- ternal capacitors as shown in the Basic Application Circuits. The range of the input supply voltage is 1.8V to 5.5V. The output characteristics of this circuit can be approximated by an ideal voltage source in series with a resistance. The voltage source equals −(V+). The output resistance R out is a function of the ON resistance of the internal MOSFET switches, the oscillator frequency, the capacitance and ESR of C 1 and C2. Since the switching current charging and dis- charging C 1 is approximately twice as the output current, the 6-Lead Small Outline Package (M6) DS100031-4 Top View With Package Marking DS100031-22 Actual Size DS100031-5 FIGURE 2. Voltage Inverting Principle www.national.com 5 |
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