Application Interface Specification; Power Supply - SimCom SIM5215 Hardware Design

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Figure 7: Bottom dimensions (Unit: mm)
3

Application Interface Specification

3.1

Power Supply

The power supply pins of SIM5215&SIM5216 include six VBAT pins. VBAT directly supplies the power
to RF PA and baseband system. For the VBAT, the ripple due to GSM/GPRS emission burst (every
4.615ms） may cause voltage drop, and the current consumption rises typically to peak of 2A. So the power
supply must be able to provide sufficient current up to more than 2A. The following figure is the VBAT
voltage ripple wave at the maximum power transmit phase.
The test condition: VBAT =4.0V, VBAT maximum output current =2A, C =100 µF tantalum capacitor
A
(ESR=0.7Ω) and C =1µF(Please refer to Figure 9—Application circuit).
B
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SIM5215&SIM5216_Hardware Design_V2.02 2012-08-31