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参数资料
| 型号： | TK73425TCB-G |
| 厂商： | TOKO INC |
| 元件分类： | 固定正电压单路输出LDO稳压器 |
| 英文描述： | 2.5 V FIXED POSITIVE LDO REGULATOR, 0.48 V DROPOUT, PDSO6 |
| 封装： | SOT89L-5, 6 PIN |
| 文件页数： | 9/22页 |
| 文件大小： | 296K |
| 代理商： | TK73425TCB-G |
TK734xxT
GC3-M001
Page 17
12. APPLICATIONS INFORMATION
12-1.Stability
The standard capacitor recommended for use on the
output side is a ceramic capacitor equal to or greater than
1.0
F. For operations at 2.4V or less, use at least a 2.2F
capacitor.
!
Stable operation area (COut≥0.47F)
0.01
0.1
1
10
100
0
200
400
600
800
1000
Iout(mA)
ES
R
(
)
安定動作領域
The above graph indicates that operation is stable in the
entire current range with a resistance of 1
or less
(equivalent series resistance or ‘ESR’) connected in series
to the output capacitor.
Generally, the ESR of a ceramic capacitor is very low
(several tens of m
), and no problems should arise in
actual use.
If an application requires use of a large ESR capacitor,
connecting a ceramic capacitor with low ESR in parallel
will enable operations at this level.
When parallel output capacitors are used, be sure to
position the ceramic capacitor as close to the IC as
possible. The other capacitor connected in parallel may
be located away from the IC. The IC will not be damaged
by the increased capacitance.
Input capacitors are necessary when the power supply
impedance increases due to battery depletion or when the
line to the power supply is particularly long. There is no
general rule that can be used to determine the required
number of capacitors used for such purposes. In some
cases, only one capacitor is necessary for several
regulator ICs. In some cases, one capacitor is required for
each IC. To determine the required number of capacitors
in a specific application, be sure to verify operation with
all parts in the installed configuration.
!
General characteristics of ceramic capacitors
CAP
(%)
12
50
Bias Voltage(V)
CAP
(%)
100
Ta(°C)
Capacitance vs Voltage
Capacitance vs Temperature
B Curve
F Curve
10
8
6
4
2
0
60
70
80
90
100
B Curve
F Curve
75
50
25
0
-25
-50
50
60
70
80
90
100
Ceramic capacitors normally have specific temperature
and voltage characteristics. Be sure to take the operating
voltage and temperature into consideration when
selecting parts for use. We recommend parts featuring B
characteristics.
For evaluation
Kyocera : CM05B104K10AB , CM05B224K10AB ,
CM105B104K16A , CM105B224K16A ,
CM21B225K10A
Murata :
GRM36B104K10 , GRM42B104K10 ,
GRM39B104K25 , GRM39B224K10 ,
GRM39B105K6.3
Stable Area
Unstable Area
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