Ublox SARA-R4 Series, System Integration Manual

Page: 45 / 128

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
C2 C1
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
Reference Description Part Number - Manufacturer
C1 10
µ
F Capacitor Ceramic X7R 50 V Generic manufacturer
C2 10 nF Capacitor Ceramic X7R 16 V Generic manufacturer
C3 22 nF Capacitor Ceramic X7R 16 V Generic manufacturer
C4 22
µ
F Capacitor Ceramic X5R 25 V Generic manufacturer
C5 22
µ
F Capacitor Ceramic X5R 25 V Generic manufacturer
C6 100 nF Capacitor Ceramic X7R 16 V GRM155R71C104KA01 - Murata
C7 10 nF Capacitor Ceramic X7R 16 V GRM155R71C103KA01 - Murata
C8 68 pF Capacitor Ceramic C0G 0402 5% 50 V GRM1555C1E680JA01 - Murata
C9 15 pF Capacitor Ceramic C0G 0402 5% 50 V GRM1555C1E150JA01 - Murata
D1 Schottky Diode 30 V 2 A MBR230LSFT1G - ON Semiconductor
L1 4.7
µ
H Inductor 20% 2 A SLF7045T-4R7M2R0-PF - TDK
R1 470 k  Resistor 0.1 W Generic manufacturer
R2 150 k  Resistor 0.1 W Generic manufacturer
U1 Step-Down Regulator 1 A 1 MHz TS30041 - Semtech
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.