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TDA3663 Fiches technique(PDF) 6 Page - NXP Semiconductors

No de pièce TDA3663
Description  Very low dropout voltage/quiescent current 3.3 V voltage regulator
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Fabricant  PHILIPS [NXP Semiconductors]
Site Internet  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

TDA3663 Fiches technique(HTML) 6 Page - NXP Semiconductors

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© 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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