User's Manual

SARA-G3 and SARA-U2 series - System Integration Manual
UBX-13000995 - R18 Advance Information Design-in
Page 96 of 206
5V
C1
IN OUT
ADJ
GND
1
2
4
5
3
C2R1
R2
U1
EN
SARA-G3 / SARA-U2
52
VCC
53
VCC
51
VCC
GND
Figure 43: Suggested low cost solution for the VCC voltage supply application circuit using an LDO linear regulator
Reference Description Part Number - Manufacturer
C1, C2
10 μF Capacitor Ceramic X5R 0603 20% 6.3 V
GRM188R60J106ME47 - Murata
R1
27 k: Resistor 0402 5% 0.1 W
RC0402JR-0727KL - Yageo Phycomp
R2
4.7 k: Resistor 0402 5% 0.1 W
RC0402JR-074K7L - Yageo Phycomp
U1
LDO Linear Regulator ADJ 3.0 A
LP38501ATJ-ADJ/NOPB - Texas Instrument
Table 26: Suggested components for low cost solution VCC voltage supply application circuit using an LDO linear regulator
2.2.1.4 Guidelines for VCC supply circuit design using a rechargeable Li-Ion or Li-Pol battery
Rechargeable Li-Ion or Li-Pol batteries connected to the VCC pins should meet the following prerequisites to
comply with the module VCC requirements summarized in Table 6:
x Maximum pulse and DC discharge current: the rechargeable Li-Ion battery with its output circuit must be
capable of delivering to VCC pins the specified maximum peak / pulse current with 1/8 duty cycle, and a DC
current greater than the module maximum average current consumption (refer to the SARA-G3 series Data
Sheet [1] or the SARA-U2 series Data Sheet [2]). The maximum pulse discharge current and the maximum
DC discharge current are not always reported in battery data sheets, but the maximum DC discharge current
is typically almost equal to the battery capacity in Amp-hours divided by 1 hour.
x DC series resistance: the rechargeable Li-Ion battery with its output circuit must be capable of avoiding a
VCC voltage drop greater than 400 mV during transmit bursts.
2.2.1.5 Guidelines for VCC supply circuit design using a primary (disposable) battery
The characteristics of a primary (non-rechargeable) battery connected to VCC pins should meet the following
prerequisites to comply with the module VCC requirements summarized in Table 6:
x Maximum pulse and DC discharge current: the non-rechargeable battery with its output circuit must be
capable of delivering to VCC pins the specified maximum peak / pulse current with 1/8 duty cycle, and a DC
current greater than the module maximum average current consumption (refer to the SARA-G3 series Data
Sheet [1] or the SARA-U2 series Data Sheet [2]). The maximum pulse and the maximum DC discharge
current is not always reported in battery data sheets, but the maximum DC discharge current is typically
almost equal to the battery capacity in Amp-hours divided by 1 hour.
x DC series resistance: the non-rechargeable battery with its output circuit must be capable of avoiding a
VCC voltage drop greater than 400 mV during transmit bursts.