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LM2767 Datasheet(PDF) 8 Page - Texas Instruments |
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LM2767 Datasheet(HTML) 8 Page - Texas Instruments |
8 / 21 page LM2767 V+ CAP+ OUT GND Oscillator Switch Array Switch Drivers CAP- LM2767 SNVS069D – FEBRUARY 2000 – REVISED AUGUST 2015 www.ti.com 8 Detailed Description 8.1 Overview The LM2767 CMOS charge-pump voltage converter operates as a voltage doubler for an input voltage in the range of 1.8 V to 5.5 V. Two low-cost capacitors and a diode (needed during start-up) are used in this circuit. 8.2 Functional Block Diagram 8.3 Feature Description The LM2767 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 capacitors. Figure 11 illustrates the voltage conversion scheme. When S2 and S4 are closed, C1 charges to the supply voltage V+. During this time interval, switches S1 and S3 are open. In the next time interval, S2 and S4 are open; at the same time, S1 and S3 are closed, the sum of the input voltage V+ and the voltage across C1 gives the 2V+ output voltage when there is no load. The output voltage drop when a load is added is determined by the parasitic resistance (Rds(on) of the MOSFET switches and the ESR of the capacitors) and the charge transfer loss between capacitors. Details are discussed in Application and Implementation. 8.4 Device Functional Modes The LM2767 is always enabled when power is applied to the V+ pin (1.8 V ≤ VIN ≤ 5.5 V). To disable the part, power must be removed. 8 Submit Documentation Feedback Copyright © 2000–2015, Texas Instruments Incorporated Product Folder Links: LM2767 |
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