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TDA3673 Datasheet(PDF) 6 Page - NXP Semiconductors

Part No. TDA3673
Description  Very low dropout voltage/quiescent current 3.3 V voltage regulator with enable
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Maker  PHILIPS [NXP Semiconductors]
Homepage  http://www.nxp.com
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TDA3673 Datasheet(HTML) 6 Page - NXP Semiconductors

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2000 Feb 01
6
Philips Semiconductors
Preliminary specification
Very low dropout voltage/quiescent current
3.3 V voltage regulator with enable
TDA3673
TEST AND APPLICATION INFORMATION
andbook, halfpage
MGS595
VP
81
2, 3, 6, 7
C2
VI(EN)
5
TDA3673
10
µF
C1(1)
1
µF
VREG = 3.3 V
Fig.3 Test circuit.
VI(EN) =5V.
(1) C1 is optional (to minimize supply noise only).
handbook, halfpage
MDA961
ESR
(
Ω)
C2 (
µF)
102
10
1
10−1
10−1
110
102
stable region
(2)
(1)
Fig.4
Graph for selecting the value of the output
capacitor.
(1) Maximum ESR at 200
µA ≤ IREG ≤ 100 mA.
(2) Minimum ESR only when IREG ≤ 200 µA.
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
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 4 and 5.
The following four examples show the effects of the
stabilization circuit using different values for the output
capacitor.
OUTPUT
CURRENT
IREG (mA)
NOISE FIGURE (
µV)
C2 = 10
µFC2 = 47 µF C2 = 100 µF
0.5
550
320
300
50
650
400
400
handbook, halfpage
MDA962
ESR
(
Ω)
IREG (mA)
103
102
10
22
1
10−1
110
103
102
stable region
Fig.5
ESR as a function of IREG for selecting the
value of the output capacitor.


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