Gemalto M2M GmbH ALS1-US Manual Do Utilizador

®

3.2 Power Supply



ALS1-US_HIO_v01.000

2013-08-14

Confidential / Preliminary

Page 19 of 34

ALS1-US needs to be connected to a power supply at the SMT application interface - 4 lines 

each BATT+ and GND. There are two separate voltage domains for BATT+:

• BATT+_RF with 2 lines for the RF power amplifier supply 

• BATT+ with 2 lines for the general power management. 

The main power supply from an external application has to be a single voltage source and has 

to be expanded to two sub paths (star structure). Each voltage domain must be decoupled by 

application with low ESR capacitors (

>

 47µF MLCC @ BATT+; 

>

 4x47µF MLCC @ BATT+_RF) 

as close as possible to LGA pads. 

 shows a sample circuit for decoupling capacitors 

for BATT+.

Decoupling capacitor(s) for BATT+

The power supply of ALS1-US must be able to provide the peak current during the uplink trans-

mission. 

All key functions for supplying power to the device are handled by the power management IC. 

It provides the following features:

• Stabilizes the supply voltages for the baseband using switching regulators and low drop lin-

ear voltage regulators.

• Switches the module's power voltages for the power-up and -down procedures.

• Delivers, across the VEXT line, a regulated voltage for an external application.

• LDO to provide SIM power supply.

BATT+

2
2

Decoupling capacitors

e.g. 47µF X5R MLCC

4x

GND

BATT+

BATT+_RF

Module

SMT interface

1x