u-blox SARA-G3 Series, System Integration Manual

Page: 97 / 218

SARA-G3 series - System Integration Manual
UBX-13000995 - R06 Objective Specification Design-in
Page 97 of 218
Reference Description Part Number - Manufacturer
C1, C2 10 µF Capacitor Ceramic X5R 0603 20% 6.3 V GRM188R60J106ME47 - Murata
R1 47 k
Ω
Resistor 0402 5% 0.1 W RC0402JR-0747KL - Yageo Phycomp
R2 9.1 k
Ω
Resistor 0402 5% 0.1 W RC0402JR-079K1L - Yageo Phycomp
R3 3.9 k
Ω
Resistor 0402 5% 0.1 W RC0402JR-073K9L - Yageo Phycomp
U1 LDO Linear Regulator ADJ 3.0 A LT1764AEQ#PBF - Linear Technology
Table 15: Suggested components for VCC voltage supply application circuit using an LDO linear regulator
2.1.1.4 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 6Table 6 :

Maximum pulse and DC discharge current : the rechargeable Li-Ion battery with its output circuit must be
capable of delivering 1.9 A current pulses with 1/8 duty-cycle to the VCC pins and must be capable
of delivering a DC current greater than the module maximum average current consumption to VCC
pins. 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

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
2.1.1.5 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 6Table 6 :

Maximum pulse and DC discharge current : the non-rechargeable battery with its output circuit must be
capable of delivering 1.9 A current pulses with 1/8 duty-cycle to the VCC pins and must be capable
of delivering a DC current greater than the module maximum average current consumption at the VCC
pins. 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
 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
2.1.1.6 Additional guidelines for VCC supply circuit design
To reduce voltage drops, use a low impedance power source. The resistance of the power supply lines
(connected to the
VCC and GND pins of the module) on the application board and battery pack should
also be considered and minimized: cabling and routing must be as short as possible to minimize power
losses.
Three pins are allocated for
VCC supply. Another twenty pins are designated for GND connection. Even if
all the VCC pins and all the GND pins are internally connected within the module, it is recommended to
properly connect all of them to supply the module to minimize series resistance losses.