TDA3681ATH/N1S,518 NXP Semiconductors, TDA3681ATH/N1S,518 Datasheet - Page 17
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TDA3681ATH/N1S,518
Manufacturer Part Number
TDA3681ATH/N1S,518
Description
IC REG MULTIPLE VOLTAGE 20HSOP
Manufacturer
NXP Semiconductors
Datasheet
1.TDA3681ATHN1S518.pdf
(22 pages)
Specifications of TDA3681ATH/N1S,518
Package / Case
*
Applications
Ignition Buffer, Regulator
Current - Supply
110µA
Voltage - Supply
9.5 V ~ 18 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Number Of Outputs
4
Polarity
Positive
Output Voltage
8.5 V or 5 V or 5 V or 3.3 V
Output Type
Fixed
Dropout Voltage (max)
0.7 V @ 550 mA or 0.6 V @ 100 mA
Line Regulation
75 mV
Load Regulation
150 mV
Maximum Power Dissipation
62000 mW
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Minimum Operating Temperature
- 40 C
Lead Free Status / RoHS Status
Lead free by exemption / RoHS compliant by exemption
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Lead free by exemption / RoHS compliant by exemption
Other names
935289136518
Philips Semiconductors
Application information
N
Table 1 Noise figures
Note
1. Measured at a bandwidth of 30 kHz.
The noise on the supply line depends on the value of the
supply capacitor and is caused by a current noise (the
output noise of the regulators is translated to a current
noise by the output capacitors). The noise is minimal when
a high frequency capacitor of 220 nF in parallel with an
electrolytic capacitor of 100 F is connected directly to the
supply pins V
S
The regulators are stabilized by the externally connected
output capacitors.
2003 Aug 29
handbook, halfpage
REGULATOR
TABILITY
OISE
Multiple voltage regulator with
switch and ignition buffer
Fig.9
1
2
3
4
ESR
( )
Curve for selecting the value of the output
capacitor for regulators 1, 3 and 4.
20
15
10
5
0
P1
0.1
, V
C
P2
o
and GND.
= 10 F C
170
440
120
85
stable region
1
NOISE FIGURE ( V)
maximum ESR
o
10
= 47 F C
110
240
100
70
C ( F)
MGL912
100
o
(1)
= 100 F
110
190
80
55
17
The output capacitors can be selected by using the graphs
given in Figs 9 and 10. When an electrolytic capacitor is
used, its temperature behaviour can cause oscillations at
a low temperature. The two examples below show how an
output capacitor value is selected.
Example 1
Regulators 1, 3 and 4 are stabilized with an electrolytic
output capacitor of 220 F (ESR = 0.15 ).
At T
73 F and the ESR is increased to 1.1 . The regulator
remains stable at T
Example 2
Regulator 2 is stabilized with a 10 F electrolytic capacitor
(ESR = 3 ). At T
decreased to 3 F and the ESR is increased to 23.1 .
As can be seen from Fig.10, the regulator will be unstable
at T
Solution
To avoid problems with stability at low temperatures, the
use of tantalum capacitors is recommended. Use a
tantalum capacitor of 10 F or a larger electrolytic
capacitor.
handbook, halfpage
Fig.10 Curve for selecting the value of the output
amb
amb
= 30 C.
ESR
= 30 C, the capacitor value is decreased to
( )
capacitor for regulator 2.
14
12
10
8
6
4
2
0
2
0.22
amb
amb
= 30 C, the capacitor value is
= 30 C (see Fig.9).
1
maximum ESR
minimum ESR
stable region
10
Product specification
C ( F)
TDA3681A
MGL913
100