User's Manual

6. 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 performances, hence read carefully the
requirements and the guidelines that will follow for a proper design.
6.1. 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
3.8 V
Normal Operating Voltage Range
3.4 V÷ 4.20 V
Extended Operating Voltage Range
3.22 V÷ 4.50 V
VOLTAGE RIPPLE
Normal conditions, Power control level for
Pout Max
Value
@ f <200KHz
50mV
@ f >200KHz
2m V
NOTE:
The Operating Voltage Range MUST never be exceeded; care must be taken in order to fulfil
min/max voltage requirement.
NOTE:
Overshoot voltage (regarding MAX Extended Operating Voltage) and drop in voltage
(regarding MIN Extended Operating Voltage) MUST never be exceeded;
The “Extended Operating Voltage Range” can be used only with completely assumption and
application of the HW User guide suggestions.
NOTE:
When the power supply voltage is lower than 3.4V, to turn ON the module, the pad ON# must
be tied low for at least 3 seconds. See para 5.1.