Fibocom L610 Series User Manual

Reproduction forbidden without Fibocom Wireless Inc. written authorization - All Rights Reserved
FIBOCOM L610 Series Hardware Guide Page 28 of 59
Figure 3-2 Recommended power design
Note:
VBAT_RF and VBAT_BB are included in the subsequent documents.
Power filter capacitor design is shown in the following table:
Recommended
Capacitor
Application
Description
220uF x 2,10uF
Regulating capacitor
Reduce power fluctuations during
module operation, requiring low ESR
capacitor
 LDO or DCDC power requires not
less than 440uF capacitor
 Battery power can be properly
reduced to 100~220uF capacitor
1uF,100nF
Digital signal noise
Filter clock and digital signal
interference
33pF
700, 850/900 MHz band
Filter low band RF interference
8.2pF
1700/1800/1900, 2100/2300, 2500/2600
MHz band
Filter middle/high band RF
interference
The power stability ensures the normal operation of L610 modules. The design requires special attention
to the power ripple below 300mV (the circuit ESR < 150mΩ). When the module is operating in GSM mode
(Burst transmit), the maximum operating current can reach 2 A, and the power voltage needs to be at
least 3.4 V. Otherwise, the module may power off or restart. The power limit is shown in Figure 3-3:

Fibocom L610 Series Specifications

General

Brand	Fibocom
Model	L610 Series
Category	Control Unit
Language	English