Ublox SARA-G450 Series User Manual

SARA-G450 - System integration manual
UBX-18046432 - R08 Design-in Page 60 of 143
C1-Public
Figure 24 and the components listed in Table 14 show an example of a low cost power supply circuit,
where the VCC module supply is provided by a step-down switching regulator capable of delivering to
VCC pins the specified maximum peak / pulse current, transforming a 12 V supply input.
SARA-G450
12V
R5
C6C1
VCC
INH
FSW
SYNC
OUT
GND
2
6
3
1
7
8
C3
C2
D1
R1
R2
L1
U1
GND
FB
COMP
5
4
R3
C4
R4
C5
52
VCC
53
VCC
51
VCC
Figure 24: Suggested low cost solution for the VCC voltage supply application circuit using step-down regulator
Reference
Description
Part number - Manufacturer
C1
22 µF capacitor ceramic X5R 1210 10% 25 V
GRM32ER61E226KE15 – Murata
C2
100 µF capacitor tantalum B_SIZE 20% 6.3V 15m
T520B107M006ATE015 – Kemet
C3
5.6 nF capacitor ceramic X7R 0402 10% 50 V
GRM155R71H562KA88 – Murata
C4
6.8 nF capacitor ceramic X7R 0402 10% 50 V
GRM155R71H682KA88 – Murata
C5
56 pF capacitor ceramic C0G 0402 5% 50 V
GRM1555C1H560JA01 – Murata
C6
220 nF capacitor ceramic X7R 0603 10% 25 V
GRM188R71E224KA88 – Murata
D1
Schottky diode 25V 2 A
STPS2L25 – STMicroelectronics
L1
5.2 µH inductor 30% 5.28A 22 m
MSS1038-522NL – Coilcraft
R1
4.7 k resistor 0402 1% 0.063 W
RC0402FR-074K7L – Yageo
R2
910  resistor 0402 1% 0.063 W
RC0402FR-07910RL – Yageo
R3
82  resistor 0402 5% 0.063 W
RC0402JR-0782RL – Yageo
R4
8.2 k resistor 0402 5% 0.063 W
RC0402JR-078K2L – Yageo
R5
39 k resistor 0402 5% 0.063 W
RC0402JR-0739KL – Yageo
U1
Step-down regulator 8-VFQFPN 3 A 1 MHz
L5987TR – ST Microelectronics
Table 14: Suggested components for the low cost solution VCC voltage supply application circuit using a step-down
regulator

Ublox SARA-G450 Series Specifications

General

Brand	Ublox
Model	SARA-G450 Series
Category	GSM/GPRS Modules
Language	English