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参数资料
| 型号： | TK11231CMCL |
| 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： | 3.1 V FIXED POSITIVE LDO REGULATOR, 0.37 V DROPOUT, PDSO6 |
| 封装： | SOT-23, 6 PIN |
| 文件页数： | 20/22页 |
| 文件大小： | 542K |
| 代理商： | TK11231CMCL |
TOKO Inc.
IC Data Sheet
TK112xxC
GC3-H026
GC3-H026B
B
BPage
Page
Page 7
Input
Input /Output Capacitors
/Output Capacitors
Linear regulators require input and output capacitors in order to maintain the regulator's loop stability. If a 0.1
F
capacitor is connected to the output side, the IC provides stable operation at any voltage in the practical current
region. However, increase the CL capacitance when using the IC in the low current region and low voltage.
Otherwise, the IC oscillates.
The equivalent series resistance (ESR) of the output capacitor must be in the stable operation area. However, it is
recommended to use as large a value of capacitance as is practical. The output noise and the ripple noise decrease
as the capacitance value increases. ESR values vary widely between ceramic and tantalum capacitors. However,
tantalum capacitors are assumed to provide more ESR damping resistance, which provides greater circuit stability.
This implies that a higher level of circuit stability can be obtained by using tantalum capacitors when compared to
ceramic capacitors with similar values.
The input capacitor is necessary when the battery is discharged, the power
supply impedance increases, or the line distance to the power supply is long.
This capacitor might be necessary on each individual IC even if two or more regulator ICs are used. It is not
possible to determine this indiscriminately. Please confirm the stability while mounted. The IC provides stable
operation with an output side capacitor of 0.1
F (Vout ≥ 2.5V). If it is 0.1F or more over the full range of
temperature, either a ceramic capacitor or tantalum capacitor can be used without considering ESR. It is not
possible to say indiscriminately. Please confirm stability while mounted.
Output voltage, Output current vs. Stable Operation Area
The above graphs show stable operation with a ceramic capacitor of 0.1uF (excluding the low current region). If the
capacitance is not increased in the low voltage, low current area, stable operation may not be achieved. Please select
the best output capacitor according to the voltage and current used. The stability of the regulator improves if a big
output side capacitor is used (the stable operation area extends.) Please use as large a capacitance as is practical.
Although operation above 150 mA has not been described, stability is equal to or better than operation at 150 mA.
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 recommend characteristics.
For evaluation
Kyocera
:CM05B104K10AB , CM05B224K10AB , CM105B104K16A , CM105B224K16A , CM21B225K10A
Murata
:GRM36B104K10 , GRM42B104K10 , GRM39B104K25 , GRM39B224K10 , GRM39B105K6.3
Iout [mA]
CL
≥0.33F All Stable
Iout [mA]
CL
≥0.33F All Stable
Iout [mA]
CL
≥0.68F All Stable
Iout [mA]
CL
≥1.0F All Stable
Iout [mA]
CL
≥2.2F All Stable
0.01
0.1
1
10
100
0.5
50
100
150
ES
R[
]
Vout=5.0V
0.01
0.1
1
10
100
150
0.5
50
100
ES
R
[
]
Vout=4.0V
Stable
Stable Area
Area
CL=0.068
F
Vout=
Vout=2.5V,
2.5V,
2.5V, 3.0V
3.0V
0.01
0.1
1
10
100
0.5
50
100
150
ES
R[
]
Stable
Stable Area
Area
CL=0.
CL=0.068
068
F
Vout=
Vout=1.8
1.8
1.8V
V
V , 2.2
, 2.2
, 2.2V
V
0.01
0.1
1
10
100
2.0
50
100
150
ES
R[
]
Vout=1.5V
0.01
0.1
1
10
100
4.0
50
100
150
ES
R
[
]
Stable
Stable Area
Area
CL=
CL=0.1
0.1
F
Stable
Stable Area
Area
CL=0.068
F
Stable
Stable Area
Area
CL=0.
CL=0.068
068
F
The recommended value : Cin=CL=0.22
F(MLCC) Iout ≥ 0.5mA.
Cin=0.22
F
0.1F
Vout
CL=0.22
F
0.1F
% Capacitance vs. Voltage
0
Bias voltage(V)
CAP
24
6
8
10
50
60
70
80
90
100
B Curve
F Curve
Capacitance vs. Temperature
%
60
50
80
90
100
70
CAP
-50 -25
0
25
50
75 100
Ta(
°C)
B Curve
F Curve
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