Quectel EG915U-EU Manual page 33

LTE Standard Module Series
voltage source and can be expanded to two sub paths with the star structure. The width of VBAT_BB
trace should be no less than 2.0 mm. The width of VBAT_RF trace should be no less than 2.5 mm. In
principle, the longer the VBAT trace is, the wider it will be.
In addition, in order to ensure the stability of power source, it is suggested that a TVS diode of which
reverse stand-off voltage is 4.7 V and peak pulse power is up to 2550 W should be used. The following
figure shows the reference circuit with and without charging function.
VBAT
VBAT_RF
VBAT_BB
C1 + C5 +
C4 C6 C7 C8
D1 C2 C3
Module
100 nF 33 pF 10 pF 100 µ F 100 nF 33 pF 10 pF
100 µF
WS4.5D3HV
Figure 8: Star Structure of the Power Supply
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