Power Supply Design Guide - Sunsea AIoT SIMCom SIM7600NA User Manual

3.1.1

Power Supply Design Guide

Make sure that the voltage on the VBAT pins will never drop below 3.4V, even during a transmit
burst, when current consumption may rise up to 2A. If the voltage drops below 3.4V, the RF
performance may be affected.
Note: If the power supply for VBAT pins can support up to 2A, more than 300uF capacitors are
recommended .Otherwise users must use a total of 1000uF capacitors typically, in order to avoid
of the voltage drop more than 300mV.
Some multi-layer ceramic chip (MLCC) capacitors (0.1/1uF) with low ESR in high frequency band
can be used for EMC.
These capacitors should be put as close as possible to VBAT pads. Also, users should keep VBAT
trace on circuit board wider than 2 mm to minimize PCB trace impedance. The following figure
shows the recommended circuit.
Recommend Bead for vbat filter is BLM21PG300SN1D and MPZ2012S221A。
In addition, in order to guard for over voltage protection, it is suggested to use TVS.
Note: user could only power pin 62, 63 or only power pin 38, 39, for these pins are connected
inside the MODULE.
Table 7: Recommended TVS list
No. Manufacturer
1 JCET
2 WAYON
3 WILLSEMI
4 WILLSEMI
5* PRISEMI
6*
WAYON
Note: If user chooses TVS, please pay attention to Clamping Voltage in your datasheet . For
example when the surge input is 100V,the Clamping Voltage is less than 10V.
* If vbat is higher than 3.8V, do not choose 5 and 6.
SIM7600NA_user manual _V1.00
Figure 6: Power supply application circuit
Part Number
ESDBW5V0A1
WS05DPF-B
ESD5611N
ESD56151W05
PESDHC2FD4V5BH
WS4.5DPV
24
Smart Machine Smart Decision
Power dissipation
5V
5V
5V
5V
4.5V
4.5V
2020-1-7
Package
DFN1006-2L
DFN1006-2L
DFN1006-2L
SOD-323
DFN1006-2L
DFN1610-2L