User's Manual

EHS5-E/EHS5-US Hardware Interface Overview
3.2 Power Supply
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EHS5_HIO_v01.000 Page 20 of 35 2012-11-14
Confidential / Preliminary
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3.2 Power Supply
EHS5-E/EHS5-US needs to be connected to a power supply at the SMT application interface
(2 lines each BATT+ and GND).
The power supply of EHS5-E/EHS5-US 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.