Integration Manual
TSD-19090601 - R15 Contents Page 70 of 143
Pre-charge constant current (active when the battery is deeply discharged): the battery is charged with
a low current, set to 10% of the fast-charge current.
Fast-charge constant current: the battery is charged with the maximum current, configured by the value
of an external resistor to a value suitable for the application.
Constant voltage: when the battery voltage reaches the regulated output voltage (4.2 V), the current is
progressively reduced until the charge termination is done. The charging process ends when the charging
current reaches 10% of the fast-charge current or when the charging timer reaches the value configured
by an external capacitor.
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 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
to 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.
C10 C13
GND
C12C11
TOBY-L3 series
71
VCC
72
VCC
70
VCC
+
Primary
Source
R3
U
1
ENn
ILIM
ISET
TMR
AGND
VIN
C2
C
1
12V
NTC
PGND
SW
SYS
BAT
C4
R
1
R2
D
1
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
D3
R6
SYSFB
R7
Figure 16: 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
Various manufacturer
C1, 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
C5
330 µF Capacitor Tantalum D_SIZE 6.3 V 45 m
T520D337M006ATE045 - KEMET
C7, C12
68 pF Capacitor Ceramic C0G 0402 5% 50 V
GRM1555C1H680JA01 - Murata
C8, C13
15 pF Capacitor Ceramic C0G 0402 5% 25 V
GRM1555C1E150JA01 - Murata
C11
10 nF Capacitor Ceramic X7R 0402 10% 16 V
GRM155R71C103KA01 - Murata