SARA-R4 series - System integration manual
UBX-16029218 - R20 Design-in Page 45 of 128
C1-Public
Figure 21 and the components listed in Table 11 show an example of a high reliability power supply
circuit for SARA-R410M modules, which do not support the 2G radio access technology. In this
example, the module VCC is supplied by a step-down switching regulator capable of delivering the
maximum peak / pulse current specified for the LTE use-case, with low output ripple and with fixed
switching frequency in PWM mode operation greater than 1 MHz.
SARA-R410M
12V
C2C1
VCC
EN
PG
VSW
GND
8
9
1
4
2
D1
L1
U1
BST
FB
5
R1
R2
52 VCC
53
VCC
51
VCC
GND
3V8
C6 C7 C8
PGND
C4
C3
C5
11
10
C9
Figure 21: Example of high reliability VCC supply circuit for SARA-R410M, using a step-down regulator
Part Number - Manufacturer
10 µF Capacitor Ceramic X7R 50 V
10 nF Capacitor Ceramic X7R 16 V
22 nF Capacitor Ceramic X7R 16 V
22 µF Capacitor Ceramic X5R 25 V
22 µF Capacitor Ceramic X5R 25 V
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
MBR230LSFT1G - ON Semiconductor
SLF7045T-4R7M2R0-PF - TDK
Step-Down Regulator 1 A 1 MHz
Table 11: High reliability VCC supply circuit components for SARA-R410M, 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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