Product Info

LPWA Module Series
BG600L-M3 Hardware Design
BG600L-M3_Hardware_Design 32 / 83
2.5.2 Decrease Voltage Drop
The power supply range of the BG600L-M3 is 3.3–4.3 V. Please make sure that the input voltage will
never drop below 3.3 V.
The following figure shows the voltage drop during burst transmission in 2G network of BG600L-M3
module. The voltage drop will be less in LTE Cat M1 and/or LTE Cat NB2 networks.
Figure 4: Power Supply Limits during Burst Transmission
To decrease voltage drop, a bypass capacitor of about 100 µF with low ESR should be used, and a
multi-layer ceramic chip capacitor (MLCC) array should also be reserved due to its low ESR. It is
recommended to use three ceramic capacitors (100 nF, 33 pF, 10 pF) for composing the MLCC array,
and place these capacitors close to VBAT pins. The main power supply from an external application has
to be a single voltage source and can be expanded to two sub paths with star structure. The width of
VBAT_BB trace should be no less than 0.5 mm, and the width of VBAT_RF trace should be no less than
2 mm. In principle, the longer the VBAT trace is, the wider it will be.
In addition, in order to get a stable power source, it is suggested to use a TVS with low leakage current
and suitable reverse stand-off voltage, and also it is recommended to place it as close to the VBAT pins as
possible. The following figure shows the star structure of the power supply.
GND
14, 16, 27, 31, 40, 42,
44, 45, 48, 49
Ground - - - -