Integration Manual

SARA-R4/N4 series - System Integration Manual
UBX-16029218 - R13 Design-in Page 43 of 119
Figure 18 and the components listed in Table 11 show an example of a low cost power supply circuit suitable for all the
SARA-R4/N4 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/ N4
12V
R5
C2C1
VCC
INH
FSW
SYNC
OUT
GND
2
6
3
1
7
8
C3
D1
R1
R2
L1
U1
GND
FB
COM P
5
4
R3
C4
R4
C5
52
VCC
53
VCC
51
VCC
C6
C7 C8 C9 C10
Figure 18: Example of low cost VCC supply circuit for SARA-R4/N4 series modules, using a step-down regulator
Reference Description Part Number - Manufacturer
C1 22 µF Capacitor Ceramic X5R 1210 10% 25 V Generic manufacturer
C2 220 nF Capacitor Ceramic X7R 0603 10% 25 V Generic manufacturer
C3 5.6 nF Capacitor Ceramic X7R 0402 10% 50 V Generic manufacturer
C4 6.8 nF Capacitor Ceramic X7R 0402 10% 50 V Generic manufacturer
C5 56 pF Capacitor Ceramic C0G 0402 5% 50 V Generic manufacturer
C6
100 µF Capacitor Tantalum B_SIZE 20% 6.3V 15mΩ
T520B107M006ATE015 – Kemet
C7 100 nF Capacitor Ceramic X7R 16 V GRM155R71C104KA01 - Murata
C8 10 nF Capacitor Ceramic X7R 16 V GRM155R71C103KA01 - Murata
C9 68 pF Capacitor Ceramic C0G 0402 5% 50 V GRM1555C1E680JA01 - Murata
C10 15 pF Capacitor Ceramic C0G 0402 5% 50 V GRM1555C1E150JA01 - Murata
D1 Schottky Diode 25V 2 A STPS2L25 – STMicroelectronics
L1
5.2 µH Inductor 30% 5.28A 22 mΩ
MSS1038-522NL – Coilcraft
R1
4.7 kΩ Resistor 0402 1% 0.063 W
Generic manufacturer
R2
910 Ω Resistor 0402 1% 0.063 W
Generic manufacturer
R3
82 Ω Resistor 0402 5% 0.063 W
Generic manufacturer
R4
8.2 kΩ Resistor 0402 5% 0.063 W
Generic manufacturer
R5
39 kΩ Resistor 0402 5% 0.063 W
Generic manufacturer
U1 Step-Down Regulator 8-VFQFPN 3 A 1 MHz L5987TR – ST Microelectronics
Table 11: Suggested components for low cost VCC circuit for SARA-R4/N4 series modules, using a step-down regulator
☞
☞☞
☞ See the section 2.2.1.10, and in particular Figure 27 / Table 19, for the parts recommended to be provided if the
application device integrates an internal antenna.