ML865G1 HW Design Guide
1VV0301632 Rev. 4 Page 24 of 86 2020-09-23
4. POWER SUPPLY
The power supply circuitry and board layout are a very important part in
the full product design and they strongly reflect on the product overall
performance, hence read the requirements carefully and the guidelines
that will follow for a proper design.
Power Supply Requirements
The external power supply must be connected to VBATT & VBATT_PA
signals and must fulfill the following requirements:
Power Supply
Nominal Supply Voltage 3.8V
Operating Voltage Range 3.20 V - 4.20 V
Extended Voltange Range 2.60 V - 4.50 V
VBATT
min
2.7V
CAUTION:
The range 2.60V - 3.20V can be used only if both USB and 2G are
disabled.
NOTE:
The Operating Voltage Range MUST never be exceeded; care must
be taken when designing the application’s power supply section to
avoid
having an excessive voltage drop. If the voltage drop is
exceeding the limits it could cause a Power Off of the module.
The voltage must be at least VBATT
min
to power on the module.
Overshoot voltage (regarding MAX Extended Operating Voltage) and
drop in voltage (regarding MIN Extended Operating Voltage) MUST
never be exceeded.
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