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TDA3663 Folha de dados(PDF) 6 Page - NXP Semiconductors |
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TDA3663 Folha de dados(HTML) 6 Page - NXP Semiconductors |
6 / 17 page 9397 750 15047 © Koninklijke Philips Electronics N.V. 2005. All rights reserved. Product data sheet Rev. 05 — 13 June 2005 6 of 17 Philips Semiconductors TDA3663 Very low dropout voltage/quiescent current 3.3 V voltage regulator 11.3.1 Application circuit with backup function Sometimes a backup function is needed to supply, for example, a microcontroller for a short period of time when the supply voltage spikes to 0 V (or even −1 V). This function can easily be built with the TDA3663 by using an output capacitor with a large value. When the supply voltage is 0 V (or −1 V), only a small current will flow into pin REG from this output capacitor (a few µA). The application circuit is given in Figure 4. (1) C1 is optional (to minimize supply noise only). (2) C2 ≤ 4700 µF. Fig 4. Application circuit with backup function (SO4 version) mgs587 VP 13 2, 4 TDA3663 C1(1) C2(2) 1 µF VREG = 3.3 V |
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