[AP1153ADSXX]
015000869-E-00 - 21 - 2015/01
11.8 Stability
Linear regulators require input and output capacitors in order to maintain the regulator's loop stability. If
0.22μF or larger capacitor is connected to the output pin, the IC provides stable operation at any voltage
(1.3V≤VoutTYP≤5.0V). (The capacitor must be larger than 0.22μF at all temperature and voltage range.)
If the capacitor with high Equivalent Series Resistance (ESR) is used, such as tantalum capacitor etc., the
regulator may oscillate. Please select parts with low ESR. Due to the parts are uneven, please enlarge the
capacitance as much as possible. With larger capacity, the output noise decreases more. In addition, the
response to the load change, etc. can be improved. The IC won’t be damaged by enlarging the capacity.
A recommended value of the application is Cin=Cout≥0.47μF Ceramic Capacitance.
Figure 2. Recommended value
Cout=0.1F Cout=0.22F
0.01
0.1
1
10
100
0 20 40 60 80 100
1.5V Vout
TYP
5.0V
Figure 3. Stable operation area, Output current and ESR
Figure 3 shows stable operation with a ceramic capacitor of 0.22F. Since it may oscillate if ESR is large, we
recommend using ceramic capacitor. The stability of the regulator improves with larger output capacitor (the
stable operation area extends.) Please use the capacitor with larger capacitance as possible.
For evaluation
Kyocera: CM05B104K10AB, CM05B224K10AB, CM105B104K16A, CM105B224K16A, CM21B225K10A
Murata: GRM36B104K10, GRM42B104K10, GRM39B104K25, GRM39B224K10, GRM39B105K6.3
