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參數(shù)資料
| 型號： | TK63022BCB-G |
| 廠商： | TOKO INC |
| 元件分類： | 固定正電壓單路輸出LDO穩(wěn)壓器 |
| 英文描述： | 2.2 V FIXED POSITIVE LDO REGULATOR, 0.262 V DROPOUT, PBGA4 |
| 封裝： | FC-4 |
| 文件頁數(shù)： | 17/29頁 |
| 文件大?。?/td> | 525K |
| 代理商： | TK63022BCB-G |
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TK630xxB
GC3-J013
Page 24
12. APPLICATIONS INFORMATION
12-1. Stability
Linear regulators require input and output capacitors in
order to maintain the regulator's loop stability.
An output capacitor of about 1F is required between the
output pin and ground. However, it is recommended to
use as large a value capacitor as is practical. The output
noise and the ripple noise decrease as the value of the
capacitor increases.
A recommended value of the application is as follows.
C
In=2.2F, COut=1.0F
Fig12-1: Capacitor in the application
TK63042B
V
Out
V
Cont
V
In
C
In>COut
C
Out≥1.0F
The stability of the regulator improves if the value of the
input side capacitor is lager than the value of the output
side capacitor.
An input and output capacitance of 1F can be used when
connected to a low impedance power source (like a Li
battery and so on).
It is not possible to determine this indiscriminately.
Please confirm the stability in your design.
Fig12-2: Output Current vs Stable Operation Area
V
Out=1.5V
0.01
0.1
1
10
100
0
50 100 150 200
I
Out (mA)
ESR
(
Ω
)
Stable area
C
Out
=1.0uF
Unstable area
V
Out=2.8V, 4.2V
0.01
0.1
1
10
100
0
50 100 150 200
I
Out (mA)
ESR
(
Ω
)
Stable area
C
Out=1.0uF
Unstable area
Fig.12-2 shows the stable operation area of output
current and the equivalent series resistance (ESR) with a
ceramic capacitor of 1.0F. ESR of the output capacitor
must be in the stable operation area. Please select the best
output capacitor according to the voltage and current
used. The stability of the regulator improves as the value
of the output side capacitor increases (the stable
operation area extends.) Please use as large a value
capacitor as is practical.
For evaluation
Kyocera :
CM05B104K10AB , CM05B224K10AB ,
CM105B104K16A , CM105B224K16A ,
CM21B225K10A
Murata :
GRM36B104K10 , GRM42B104K10 ,
GRM39B104K25 , GRM39B224K10 ,
GRM39B105K6.3
Fig12-3: ex. Ceramic Capacitance vs Voltage,
Temperature
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
Generally, a ceramic capacitor has both a temperature
characteristic and a voltage characteristic. Please consider
both characteristics when selecting the part. The B curves
are the recommended characteristics.
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