Ublox SARA-G450 Series - Page 68

SARA-G450 - System integration manual
UBX-18046432 - R08 Design-in Page 68 of 143
C1-Public
Using a battery pack with an internal NTC resistor, the MP2617H can monitor the battery temperature
to protect the battery from operating under unsafe thermal conditions.
Several parameters, such as the charging current, the charging timings, the input current limit, the
input voltage limit, and the system output voltage, can be easily set according to the specific
application requirements, as the actual electrical characteristics of the battery and the external
supply / charging source: suitable resistors or capacitors must be accordingly connected to the
related pins of the IC.
C9 C12
GND
C11C10 C13
SARA-G450
52
VCC
53
VCC
51
VCC
+
Primary
source
R3
U1
EN
ILIM
ISET
TMR
AGND
VIN
C2C1
12V
NTC
PGND
SW
SYS
BAT
C4
R1
R2
D1
θ
Li-Ion/Li-Pol
battery pack
B1
C5
Li-Ion/Li-Polymer battery
charger / regulator with
power path managment
VCC
C3 C6
L1
BST
D2
VLIM
R4
R5
C7 C8
Ferrite bead
or 0Ω
R6
SYSFB
R7
D3
Figure 31: Li-Ion (or Li-Polymer) battery charging and power path management application circuit
Reference
Description
Part number - Manufacturer
B1
Li-Ion (or Li-Polymer) battery pack with 10 k NTC
Generic manufacturer
C1, C5, C6
22 µF capacitor ceramic X5R 1210 10% 25 V
GRM32ER61E226KE15 - Murata
C2, C4, C10
100 nF capacitor ceramic X7R 0402 10% 16 V
GRM155R61A104KA01 - Murata
C3
1 µF capacitor ceramic X7R 0603 10% 25 V
GRM188R71E105KA12 - Murata
C7, C12
56 pF capacitor ceramic C0G 0402 5% 25 V
GRM1555C1E560JA01 - Murata
C8, C13
15 pF capacitor ceramic C0G 0402 5% 25 V
GRM1555C1E150JA01 - Murata
C9
330 µF capacitor tantalum D_SIZE 6.3 V 45 m
T520D337M006ATE045 - KEMET
C11
10 nF capacitor ceramic X7R 0402 10% 16 V
GRM155R71C103KA01 - Murata
D1, D2
Low capacitance ESD protection
CG0402MLE-18G - Bourns
D3
Schottky diode 40 V 3 A
MBRA340T3G – ON Semiconductor
R1, R3, R5, R7
10 k resistor 0402 5% 1/16 W
Generic manufacturer
R2
1.0 k resistor 0402 5% 0.1 W
Generic manufacturer
R4
22 k resistor 0402 5% 1/16 W
Generic manufacturer
R6
26.5 k resistor 0402 1% 1/16 W
Generic manufacturer
L1
1.2 µH inductor 6 A 21 m 20%
7447745012 - Wurth
U1
Li-Ion/Li-Polymer battery DC-DC charger / regulator
with integrated power path management function
MP2617H - Monolithic Power Systems (MPS)
Table 20: Suggested components for Li-Ion (or Li-Polymer) battery charging and power path management application circuit