Requirements For Voltage Stability - Quectel EC200A Series Hardware Design

DC_IN
470 µF 100 nF
⚫
NOTE
1. If you use the module that does not support the GSM band, a power supply capable of providing at
least 2 A can be used in the design.
2. It is recommended to design switch control for power supply.

3.4.3. Requirements for Voltage Stability

The power supply range of the module is from 3.4 V to 4.5 V. Please make sure the input voltage will
never drop below 3.4 V.
VBAT
Figure 7: Power Supply Limits during Burst Transmission
To decrease voltage drop, a bypass capacitor of about 100 µF with low ESR (ESR = 0.7 Ω) should be
used, and a multi-layer ceramic chip (MLCC) capacitor array should also be reserved due to its ultra-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 the VBAT_BB and VBAT_RF 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
MIC29302WU
2
IN
51K
4.7K
VBAT_EN
47K
Figure 6: Reference Design of Power Supply
Burst
Transmission
4
OUT
100K
1%
47K
1%
Burst
Transmission
Drop
LTE Standard Module Series
VBAT
330R
470 µF 100 nF
Ripple