TK11250CM Toko America, TK11250CM Datasheet - Page 20

• Manufacturer Part Number: TK11250CM
• Description: (TK112xxCM) Voltage Regulator
• Manufacturer: Toko America

INPUT-OUTPUT CAPACITORS
Linear regulators require input and output capacitors in order to maintain the regulator’s loop stability. 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.
The IC is never damaged by enlarging the capacitance.
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 IC provides
stable operation with an output side capacitor of 0.22 mF (V
of temperature, either a ceramic capacitor or tantalum capacitor can be used without considering ESR (V
For output voltage device ³ 2.0 V applications, the recommended value of CL ³ 0.22 mF.
For output voltage device ³ 1.5 V applications, the recommended value of CL ³ 0.47 mF.
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.
Please increase the output capacitor value when the load current is 0.5 mA or less. The stability of the regulator improves
if a big output side capacitor is used (the stable operation area extends).
For evalutaion
TK112xxCM
Page 20
0 .01
100
0.1
10
1
4.0
V OUT = 1.5 V
50
CL
STABLE AREA
I OUT (mA)
All Stable
CL = 0.1
2.2
For load current £ 0.5 mA, increase the output capacitor to 1 mF.
100
F
F
Kyocera: CM05B104K10AB, CM05B224K10AB, CM105B104K161, CM105B224K16A, CM21B225K10A
Murata:
150
0 .01
100
GRM36B104K10, G4M42B104K10,
0.1
10
1
2.0
V OUT = 1.8 V, 2.2 V
CL
50
I OUT (mA)
STABLE AREA
All Stable
CL = 0.068
APPLICATION INFORMATION
1.0
100
F
F
150
0 .01
100
0.1
10
1
2.0
V OUT = 2.5 V, 3.0 V
CL
50
OUT
I OUT (mA)
STABLE AREA
All Stable
GRM39B014K25, GRM39B224K10, GRM39B105K6.3
CL = 0.1
0.68
³ 2.0 V). If the capacitor is 0.1 mF or more over its full range
100
F
F
150
0 .01
100
0.1
10
C IN = 0.22 F
1
5.0
~ 0.1 F
V OUT = 4.0 V
CL
50
STABLE AREA
I OUT (mA)
All Stable
CL = 0.1
0.33
100
F
F
150
January 2002 TOKO, Inc.
0 .01
100
0.1
10
1
5.0
C L = 0.22 F
~ 0.1 F
CL
V OUT = 5.0 V
50
I OUT (mA)
STABLE AREA
All Stable
CL = 0.1
OUT
0.33
100
³ 2.0 V).
F
F
150