TDA3663 Просмотр технического описания (PDF) - Philips Electronics
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TDA3663 Datasheet PDF : 16 Pages
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Philips Semiconductors
Very low dropout voltage/quiescent current
3.3 V voltage regulator
TEST AND APPLICATION INFORMATION
Preliminary specification
TDA3663
ndbook, halfpage
VP C1(1)
1 µF
1
3
TDA3663
VREG = 3.3 V
C2
10 µF
2, 4
MGS586
(1) C1 is optional (to minimize supply noise only).
Fig.4 Test circuit (SO4).
102
handbook, halfpage
ESR
(Ω)
10
1
MDA961
(1)
stable region
10−1
10−1
(2)
1
10 C2 (µF) 102
(1) Maximum ESR at 200 µA ≤ IREG ≤ 100 mA.
(2) Minimum ESR only when IREG ≤ 200 µA.
Fig.5 Graph for selecting the value of the output
capacitor.
Noise
The output noise is determined by the value of the output
capacitor The noise figure is measured at a bandwidth of
10 Hz to 100 kHz (see Table 1).
Table 1 Noise figures
OUTPUT
CURRENT
IREG (mA)
0.5
50
NOISE FIGURE (µV)
C2 = 10 µF C2 = 47 µF C2 = 100 µF
550
320
300
650
400
400
Stability
The regulator is stabilized with an external capacitor
connected to the output. The value of this capacitor can be
selected using the diagrams shown in Figs 5 and 6.
The following four examples show the effects of the
stabilization circuit using different values for the output
capacitor.
handbook1, 0h3alfpage
ESR
(Ω)
102
22
10
1
10−1
1
stable region
10
MDA962
102
103
IREG (mA)
Fig.6 ESR as a function of IREG for selecting the
value of the output capacitor.
2000 Feb 01
7
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