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TDA3663 Folha de dados(PDF) 7 Page - NXP Semiconductors |
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7 / 15 page TDA3663_6 © NXP B.V. 2007. All rights reserved. Product data sheet Rev. 06 — 26 June 2007 7 of 15 NXP 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. (3) For reliable operation, it is recommended to have a minimum ESR of 3 Ω of the output capacitor total and to have a stable application independent of load current, temperature or output capacitance. Fig 4. Application circuit with backup function (SO4 version) 014aaa088 VP 13 2, 4 TDA3663 C1(1) C2(2) 1 µF VREG = 3.3 V ESR > 3 Ω + + |
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