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TCM680 Datasheet(PDF) 9 Page - Microchip Technology |
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TCM680 Datasheet(HTML) 9 Page - Microchip Technology |
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9 / 18 page  © 2005 Microchip Technology Inc. DS21486C-page 9 TCM680 5.3 Paralleling Devices To reduce the value of ROUT - and R OUT +, multiple TCM680 voltage converters can be connected in paral- lel (Figure 5-2). The output resistance of both outputs will be reduced, approximately, by a factor of n, where n is the number of devices connected in parallel. EQUATION EQUATION Each device requires its own pump capacitors, but all devices may share the same reservoir capacitors. To preserve ripple performance, the value of the reservoir capacitors should be scaled according to the number of devices connected in parallel. 5.4 Output Voltage Regulation The outputs of the TCM680 can be regulated to provide +5V from a 3V input source (Figure 5-3). The TCM680 performs voltage multiplication and inversion produc- ing output voltages of, approximately, +6V. The TCM680 outputs are regulated to +5V with the linear regulators TC55 and TC59. The TC54 is a voltage detector providing an indication that the input source is low and that the outputs may fall out of regulation. The input source to the TCM680 can vary from 2.8V to 5.5V without adversely affecting the output regulation mak- ing this application well suited for use with single cell Li-Ion batteries or three alkaline or nickel based batteries connected in series. FIGURE 5-2: Paralleling TCM680 for Lower Output Source Resistance. ROUT - = R OUT - (of TCM680) n (number of devices) ROUT + = R OUT + (of TCM680) n (number of devices) 10 µF 10 µF 22 µF VIN GND GND Supply TCM680 TCM680 + – + – + – + – + – VIN C1 + C2 + C1 - C2 - VOUT - VOUT - 10 µF 10 µF VIN GND C1 + C2 + C1 - C2 - Negative Supply Positive 22 µF + – VOUT + VOUT + |
Similar Part No. - TCM680 |
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Similar Description - TCM680 |
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