User's Manual

Cinterion
®
ELS61-AUS Hardware Interface Description
3.4 Power Supply
73

ELS61-AUS_HID_v00.031 2016-06-03
Confidential / Preliminary
Page 66 of 102
3.4 Power Supply
ELS61-AUS 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-AUS 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.
3.4.1 Power Supply Ratings
Table 12 and Table 18 assemble various voltage supply and current consumption ratings of the
module.
Table 12: Voltage supply ratings
Description Conditions Min Typ Max Unit
BATT+ Supply voltage Directly measured at Module.
Voltage must stay within the min/max
values, including voltage drop, ripple,
spikes
3.0 4.5 V
Maximum allowed
voltage drop
during transmit
burst
Normal condition, power control level
for Pout max
400 mV
Voltage ripple Normal condition, power control level
for Pout max
@ f <= 250 kHz
@ f > 250 kHz
120
90
mV
pp
mV
pp