Users Manual Part 1

SIM8260A_Hardware Design_V1.05
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3 Interface Application
3.1 Power Supply
The recommended power supply for SIM8260A is 3.8V and the voltage range from 3.3V to 4.4V. It is
necessary to ensure that the voltage of VABT cannot be lower than 3.3V after the maximum voltage drop.
the module will be powered off automatically. The max voltage is not higher than 4.4V, otherwise the
module may be permanently damaged.
The module has 3 BB power pins, 7 RF power pins and 10 power ground pins, to ensure the module works
normally, all power and ground pins should be connected.
Table 8: VBAT pins electronic characteristics
Symbol
Description
Min.
Typ.
Max.
Unit
VBAT
1
Module power supply voltage
3.3
3.8
4.4
V
I
peak
Peak current
-
-
1.8
A
I
peak (QTM545)
Peak current at maximum power
-
-
1.0
A
I
peak (QTM547)
Peak current at maximum power
-
-
TBD
A
I
sleep
Current in sleep mode
-
4.5
-
mA
I
leakage
Current in power off mode
-
135
-
uA
1. The VBAT include VBAT_BB and VBAT_RF pins in this document.
2.If the customer uses the charging chip PM7250B and the software with charging function, when the
power supply voltage is lower than 3.3V, the module will not be powered on. If the customer wants o
power on the module, the charger must be plugged in.
3.1.1 Power Supply Design Guide
When B2(20MHz) and N79(100MHz) ENDC combination are connected under the instrument, the peak
current can reach to 1.8A at 3.8V power supply. In order to ensure that the VBAT voltage is no less than
required 3.3V when the module at maximum power radio transmission, and considering the voltage drop
and conversion efficiency, it is strongly recommended that the DC-DC or LDO output capacity should not be
less than 3A.
NOTE