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TDA3663 Folha de dados(PDF) 7 Page - NXP Semiconductors

Nome de Peças TDA3663
Descrição Electrónicos  Very low dropout voltage/quiescent current 3.3 V voltage regulator
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Fabricante Electrônico  NXP [NXP Semiconductors]
Página de início  http://www.nxp.com
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TDA3663 Folha de dados(HTML) 7 Page - NXP Semiconductors

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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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