AP1156ADSXX Datasheet, PDF (18/25 Pages) HuaXinAn Electronics CO.,LTD – Negative Input / Output Voltage LDO Regulator

[AP1156ADSXX]
11.7 ESR Stability
IC does operate with 1.0uF Cout. If it is 1.0uF or larger, the capacitor of any type can be used in all range
without considering ESR. But 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.
The input capacitor is necessary in case the battery voltage drops, the power supply impedance increases, or
the distance to the power supply is far. 1 input capacitor might be necessary for each 1 IC or for several ICs. It
depends on circuit condition. Please confirm the stability by each circuit.
Generally, Multi-layer ceramic capacitor (MLCC) has the temperature characteristic and the voltage
characteristic. Please select parts in consideration of the voltage and the temperature used.
100
Unstable area
10
1
0.1
0.01
0
Stable area
50
100
150
Iout (mA)
Figure 2. Stability area graph
Condition:Vin=Vout(typ)-1.5V Cin=0.1μF, Cout=1.0μF (MLCC)
The output can be seen as oscillated when the overheating protection or the overcurrent protection start
operation, or the input voltage is low. In this case, please lower the power consumption, decrease the load
current or make the input voltage higher.
Generally, a ceramic capacitor has the temperature characteristic and the voltage characteristic. Please select
parts in consideration of the voltage and the temperature used. ASAHI KASEI TOKO POWER DEVICES
recommend B characteristic type.
Figure 3. (Left) Capacitance vs. Voltage; (Right) Capacitance vs. Temperature
014011333-E-00
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2014/10