MT3620
Hardware User Guide
MediaTek Confidential
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2020 MediaTek Inc.
Page 27 of 40
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VOUT_1V15 and SENSE_1V15 share a single 2.2uF decoupling capacitor.
The trace width between 2.2uF and VOUT_1V15 pins (84,85) should be ≥ 0.64mm.
Total recommend capacitance is 2.2uF~6.5uF (near PMU=2.2uF, near point of use=0~4.3uF)
while using internal 1.15V VCORE PMU.
PCB trace parasitic inductance and resistance arerecommended as follows:
Trace define from VOUT_1V15 to C55.
Trace Resistence <20 mohm .
Trace Inductance <2nH.
Figure 8-9 VOUT_1V15 LDO Output Circuit
A 0.1uF capacitor should be fitted close to each DVDD_3V3 power pin
A 0.47uF capacitor should be fitted close to each DVDD_1V15 power pin. In the case of pins 77
and 78, a single 0.1uF capacitor may be used instead of two 0.47uF capacitors. A maximum of
4.3uF closely-located decoupling is recommended for DVDD_1V15.
Decoupling capacitors can be conneted with a return path through the e-pad if that is more
convenient than using GND pins.
