Product Info

LPWA Module Series
BG95 Hardware Design
BG95_Hardware_Design 37 / 88
1)
For every VBAT transition/re-insertion from 0 V, the minimum power supply voltage should be higher
than 2.7 V. After the module starts up normally, the minimum safety voltage is 2.6 V. In order to ensure
full-function mode, the minimum power supply voltage should be higher than 2.8 V.
3.5.2. Decrease Voltage Drop
 BG95-M1/-M2/-N1: The power supply range of BG95-M1/-M2/-N1 is from 2.6 V to 4.8 V. For every
VBAT transition/re-insertion from 0 V, the minimum power supply voltage should be higher than 2.7 V.
After the module starts up normally, the minimum safety voltage is 2.6 V. In order to ensure
full-function mode, the minimum power supply voltage should be higher than 2.8 V. Please assure
the input voltage will never drop below 2.6 V.
 BG95-M3/-M5: The power supply range of the BG95-M3/-M5 is from 3.3 V to 4.3 V. Please assure
the input voltage will never drop below 3.3 V.
 BG95-M4: The typical power supply of BG95-M4 is 3.8 V.
The following figure shows the voltage drop during burst transmission in 2G network of BG95-M3/-M5.
The voltage drop will be less in LTE Cat M1 and/or LTE Cat NB2 networks.
VB AT
Burst
Transmission
Min.3.3V
Ripple
Drop
Burst
Transmission
Figure 4: Power Supply Limits during Burst Transmission (BG95-M3/-M5)
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 0.6 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
NOTE