User's Manual

Cinterion
®
ELS61-US Hardware Interface Overview
3.2 Power Supply
23
 ELS61-US_HIO_v00.281 2016-02-11
Confidential / Preliminary
Page 23 of 40
3.2 Power Supply
ELS61-US needs to be connected to a power supply at the SMT application interface - 2 lines
BATT+, and GND. There are two separate voltage domains for BATT+:
•BATT+
BB
with a line mainly for the baseband power supply.
•BATT+
RF
with a line for the UMTS/LTE 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 ELS61-US has to be a single voltage source at BATT+
BB
and BATT+
RF
. 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.