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MS2131
Hardware Design Guide
MS2131 Power Design Guide
Issue 02 (2017-1-13)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
29
Figure 7-4
3G network transmission
7.5 MS2131 Power Consumption Features
The maximum transmission power capacity for a wireless terminal in a 3G network is 24 dBm
while the maximum transient power supply current is about 2 A. Therefore, a minimum
current output capacity of 800 mA at average is required to satisfy the load requirements. The
following specifications are for reference only:
Power consumption in a 3G network with a 7.2 Mbps download speed and an RF power
capacity of 10 dB: 5 V and less than 250 mA
Power consumption in a 3G network with a 2 Mbps download speed and an RF power
capacity of 22 dB: 5 V and less than 500 mA
Power consumption in standby mode with a 3G network connected: 5 V and less than 100 mA
7.6 Peripheral Power Design Requirements
Power supplied to the MS2131 must have a minimum general current of 800 mA and a
minimum transient current of 2 A. The peripheral power design must be dedicated to these
requirements, to help the MS2131 bear the power supply voltage drop for transmission in
GSM mode.
To address the voltage drop, the following requirements must be met for peripheral power
design:
Reducing the peripheral power impedance (including the power cable routing to the
MS2131)
Adding energy storage capacitors
Using the dynamic response function of power module chips
7.6.1 Recommended Power Supply Structure
A power structure of a DC-DC output, power supply over a switching diode, and a current
limiting circuit is recommended. The host can then be enabled to control the MS2131 power
time
Power
Max 24dBm