Pin 55, pin 56 and pin 57 are VBAT power input.
On VBAT pads, the ripple current up to 0.6A typically due to LTE CAT-M1emission burst and up
to 2A typically due to GSM/GPRS emission burst (every 4.615ms). It may cause voltage drop. So
the power supply for these pads must be able to provide sufficient current up to more than 2A in
order to avoid the voltage drop is more than 300mV.
The following figure shows the VBAT voltage ripple wave at the maximum power transmit phase
in GSM emission mode.
Figure 5: VBAT voltage drop during burst emission (GSM/GPRS)
Note: The test condition: The voltage of power supply for VBAT is 3.8V, Cd=100 µF tantalum
capacitor (ESR=0.7Ω) and Cf =100nF (Please refer to Figure 6—Application circuit).
Table 6: VBAT pins electronic characteristic
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