To stabilize the LDO output voltage in a chip, an external capacitor needs to be connected to the LDO output pin LDO_CAP. The capacitor needs to be close to the LDO_CAP pin. If the chip series has multiple LDO output pins, each LDO output pin requires an external capacitor.

According to different NuMicro® Family series, the value of an external capacitor for LDO_CAP may be different. Please refer to the following table:

NuMicro® Family Series	Minimum Value of an External Capacitor
Mini51 Series	Do not need an external capacitor.
Mini58 Series	Do not need an external capacitor.
M051 Series	1 uF
M0518 Series	1 uF
NUC029xAN Series	1 uF
NUC029FAE Series	Do not need an external capacitor.
NUC100/120 Series	1 uF
NUC130/140 Series	1 uF
NUC122 Series	10 uF
NUC123 Series	1 uF
NUC131 Series	1 uF
NUC200/220 Series	1 uF
NUC230/240 Series	1 uF
Nano100 Series	10 uF
Nano1x2 Series	1 uF
NUC442/472 Series	1 uF
M451 Series	1 uF
NUC505 Series	4.7 uF

In addition, LDO_CAP can be connected to a 0.1uF bypass capacitor to filter high frequency noise.

Products:	Microcontrollers ,Arm Cortex-M0 MCUs ,M051 Base Series ,M0518 Series ,M0519 Series ,Mini51 Base Series ,Nano100/102 Base Series ,Nano110/112 LCD Series ,Nano120 USB Series ,Nano130 Advanced Series ,NUC029 Series ,NUC100/200 Advanced Series ,NUC120/122/123/220 USB Series ,NUC130/230 CAN Series ,NUC131/NUC1311 CAN Series ,NUC140/240 Connectivity Series ,Arm Cortex-M4 MCUs ,M451 Base Series ,M451M Series ,M452 USB Series ,M453 CAN Series ,NUC442/472 Series ,NUC505 Series
Applications:
Function:	Peripherals,Power Detection,LDO

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Does the LDO (Low Dropout Regulator) in the NuMicro® Family need to connect to an external capacitor? Issue Date：2015-09-25

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