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LM2663 Datasheet(PDF) 10 Page - National Semiconductor (TI) |
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LM2663 Datasheet(HTML) 10 Page - National Semiconductor (TI) |
10 / 12 page Other Applications (Continued) REGULATING V out It is possible to regulate the output of the LM2662/LM2663 by use of a low dropout regulator (such as LP2986). The whole con- verter is depicted in Figure 8. This converter can give a regulated output from −1.5V to −5.5V by choosing the proper resistor ratio: where, Vref = 1.23V The error flag on pin 7 of the LP2986 goes low when the regulated output at pin 5 drops by about 5% below nominal. The LP2986 can be shutdown by taking pin 8 low. The less than 1 µA quiescent current in the shutdown mode is favorable for battery powered applications. DS100003-26 FIGURE 6. Generating −3V in from +Vin DS100003-27 FIGURE 7. Generating +3V in from +Vin DS100003-28 FIGURE 8. Combining LM2662/LM2663 with LP2986 to Make a Negative Adjustable Regulator www.national.com 10 |
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