SARA-G3 and SARA-U2 series - System Integration Manual
UBX-13000995 - R26 Design-in
Page 101 of 217
Figure 41 and the components listed in Table 24 show an example of a high reliability power supply circuit,
where the module VCC is supplied by a step-down switching regulator capable of delivering to VCC pins the
specified maximum peak / pulse current, with low output ripple and with fixed switching frequency in PWM
mode operation greater than 1 MHz.
SARA-G3 / SARA-U2
12V
C5
R3
C4
R2
C2C1
R1
VIN
RUN
VC
RT
PG
SYNC
BD
BOOST
SW
FB
GND
6
7
10
9
5
C6
1
2
3
8
11
4
C7 C8
D1
R4
R5
L1
C3
U1
52
VCC
53
VCC
51
VCC
GND
Figure 41: Suggested schematic design for the VCC voltage supply application circuit using a step-down regulator
Part Number - Manufacturer
10 µF Capacitor Ceramic X7R 5750 15% 50 V
10 nF Capacitor Ceramic X7R 0402 10% 16 V
GRM155R71C103KA01 - Murata
680 pF Capacitor Ceramic X7R 0402 10% 16 V
GRM155R71H681KA01 - Murata
22 pF Capacitor Ceramic C0G 0402 5% 25 V
GRM1555C1H220JZ01 - Murata
10 nF Capacitor Ceramic X7R 0402 10% 16 V
GRM155R71C103KA01 - Murata
470 nF Capacitor Ceramic X7R 0603 10% 25 V
GRM188R71E474KA12 - Murata
22 µF Capacitor Ceramic X5R 1210 10% 25 V
GRM32ER61E226KE15 - Murata
330 µF Capacitor Tantalum D_SIZE 6.3 V 45 m
T520D337M006ATE045 - KEMET
MBRA340T3G - ON Semiconductor
10 µH Inductor 744066100 30% 3.6 A
744066100 - Wurth Electronics
470 k Resistor 0402 5% 0.1 W
15 k Resistor 0402 5% 0.1 W
22 k Resistor 0402 5% 0.1 W
390 k Resistor 0402 1% 0.063 W
100 k Resistor 0402 5% 0.1 W
Step-Down Regulator MSOP10 3.5 A 2.4 MHz
LT3972IMSE#PBF - Linear Technology
Table 24: Suggested components for the VCC voltage supply application circuit using a step-down regulator
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