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LM2665M6 Datasheet(PDF) 5 Page - National Semiconductor (TI) |
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LM2665M6 Datasheet(HTML) 5 Page - National Semiconductor (TI) |
5 / 8 page Connection Diagram Ordering Information Order Number Package Number Package Marking Supplied as LM2665M6 MA06A SO4A (Note 9) Tape and Reel (1000 units/rail) LM2665M6X MA06A SO4A (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 Voltage Doubler Voltage Split 1 V+ Power supply positive voltage input. Positive voltage output. 2 GND Power supply ground input Same as doubler 3 CAP− Connect this pin to the negative terminal of the charge-pump capacitor Same as doubler. 4 SD Shutdown control pin, tie this pin to ground in normal operation. Same as doubler. 5 OUT Positive voltage output. Power supply positive voltage input 6 CAP+ Connect this pin to the positive terminal of the charge-pump capacitor. Same as doubler Circuit Description The LM2665 contains four large CMOS switches which are switched in a sequence to double the input supply voltage. Energy transfer and storage are provided by external capaci- tors. Figure 2 illustrates the voltage conversion scheme. When S 2 and S4 are closed, C1 charges to the supply volt- age V+. During this time interval, switches S 1 and S3 are open. In the next time interval, S 2 and S4 are open; at the same time, S 1 and S3 are closed, the sum of the input volt- age V+ and the voltage across C 1 gives the 2V+ output volt- age when there is no load. The output voltage drop when a load is added is determined by the parasitic resistance (R d- s(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 Positive Voltage Doubler The main application of the LM2665 is to double the input voltage. The range of the input supply voltage is 2.5V to 5.5V. The output characteristics of this circuit can be approximated by an ideal voltage source in series with a resistance. The 6-Lead SOT (M6) DS100049-13 Top View With Package Marking DS100049-22 Actual Size DS100049-14 FIGURE 2. Voltage Doubling Principle www.national.com 5 |
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