SARA-R4 series - System integration manual
UBX-16029218 - R20 Design-in Page 46 of 128
C1-Public
Figure 22 and the components listed in Table 12 show an example of a low cost power supply circuit
suitable for all the SARA-R4 series modules, where the module VCC is supplied by a step-down
switching regulator capable of delivering the highest peak / pulse current specified for the 2G
use-case, transforming a 12 V supply input.
SARA-R4 series
12V
R5
C2C1
VCC
INH
FSW
SYNC
OUT
GND
2
6
3
1
7
8
C3
D1
R1
R2
L1
U1
GND
FB
COMP
5
4
R3
C4
R4
C5
52
VCC
53
VCC
51
VCC
C6
C7 C8 C9 C10
Figure 22: Example of low cost VCC supply circuit for SARA-R4 series modules, using a step-down regulator
Part Number - Manufacturer
22 µF Capacitor Ceramic X5R 1210 10% 25 V
220 nF Capacitor Ceramic X7R 0603 10% 25 V
5.6 nF Capacitor Ceramic X7R 0402 10% 50 V
6.8 nF Capacitor Ceramic X7R 0402 10% 50 V
56 pF Capacitor Ceramic C0G 0402 5% 50 V
100 µF Capacitor Tantalum B_SIZE 20% 6.3V 15m
T520B107M006ATE015 – Kemet
100 nF Capacitor Ceramic X7R 16 V
GRM155R71C104KA01 - Murata
10 nF Capacitor Ceramic X7R 16 V
GRM155R71C103KA01 - Murata
68 pF Capacitor Ceramic C0G 0402 5% 50 V
GRM1555C1E680JA01 - Murata
15 pF Capacitor Ceramic C0G 0402 5% 50 V
GRM1555C1E150JA01 - Murata
STPS2L25 – STMicroelectronics
5.2 µH Inductor 30% 5.28A 22 m
MSS1038-522NL – Coilcraft
4.7 k Resistor 0402 1% 0.063 W
910 Resistor 0402 1% 0.063 W
82 Resistor 0402 5% 0.063 W
8.2 k Resistor 0402 5% 0.063 W
39 k Resistor 0402 5% 0.063 W
Step-Down Regulator 8-VFQFPN 3 A 1 MHz
L5987TR – ST Microelectronics
Table 12: Suggested components for low cost VCC circuit for SARA-R4 series modules, using a step-down regulator
☞ See the section 2.2.1.10, and in particular Figure 31 / Table 20, for the parts recommended to be
provided if the application device integrates an internal antenna.
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