User's Manual


PDS8
_
HIO_v02.800
Confidential / Preliminary
2014-10-27
Cinterion
®
PDS8 Hardware Interface Overview
3.2 Power Supply
Page 19 of 35
3.2 Power Supply
PDS8 needs to be connected to a power supply at the SMT application interface
- 6 lines BATT+, and GND. There are two separate voltage domains for BATT+:
• BATT+
BB
with a line for the general power management.
• BATT+
RF
with a line for the GSM power amplifier supply.
Please note that throughout the document BATT+ refers to both voltage domains and power
supply lines - BATT+
BB
and BATT+
RF
.
The power supply of PDS8 has to be a single voltage source at BATT+. It must be
able to
provide the peak current during the uplink transmission.
All the key functions for supplying power to the device are handled by the power management
section of the analog controller. This IC provides the following features:
• Stabilizes the supply voltages for the baseband using low drop linear voltage regulators and
a DC-DC step down switching regulator.
• Switches the module's power voltages for the power-up and -down procedures.
• SIM switch to provide SIM power supply.