MAX8903CETI+ Maxim Integrated Products, MAX8903CETI+ Datasheet - Page 20

• Manufacturer Part Number: MAX8903CETI+
• Description: IC DC/DC CHARGER LI+ 2A 28-TQFN
• Manufacturer: Maxim Integrated Products
• Series: Smart Power Selector™r

Specifications of MAX8903CETI+

• Function: Charge Management
• Battery Type: Lithium-Ion (Li-Ion)
• Voltage - Supply: 4.1 V ~ 16 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 28-TQFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

2A 1-Cell Li+ DC-DC Chargers for USB
and Adapter Power
Figure 6. MAX8903A Charger State Flow Chart
20
t
t
t
t
PREQUAL
FST CHG
TOP OFF
T T OP OFF
TIMER RESUME
______________________________________________________________________________________
−
−
−
V
THM OK
BAT
UOK OR DOK PREVIOUS STATE
TEMPERATURE SUSPEND
< V
CHG = HIGH IMPEDANCE
FLT = HIGH IMPEDANCE
=
=
=
=
BATPQ
RESET TIMER
ANY CHARGING
15
132
33
660
I
CHG
- 180mV
s MAX
STATE
min
min
min
= 0mA
(
MAX
×
×
×
0 15
THM NOT OK
TIMER SUSPEND
8903
0 15
C
.
0 0 15
8903
.
C
.
CT
C
CT
μ
CT
A MAX
μ
μF
F
D MAX
F
(
MAX
8903
MAX
8903
8903
V
BAT
C
8903
Y
< V
RESET TIMER = 0
)
B MAX
BATPQ
RESET TIMER
G
I
CHG
)
UOK AND DOK = HIGH IMPEDANCE
V
BATREG
- 180mV
> I
CHG = HIGH IMPEDANCE
UOK AND/OR DOK = LOW
UOK AND/OR DOK = LOW
CHG = HIGH IMPEDANCE
FLT = HIGH IMPEDANCE
V
TERM
890
FLT = HIGH IMPEDANCE
FLT = HIGH IMPEDANCE
UOK AND/OR DOK = LOW
FLT = HIGH IMPEDANCE
CHG = HIGH IMPEDANCE
FLT = HIGH IMPEDANCE
PREQUALIFICATION
UOK AND/OR DOK = 0
BATPQ
I
0 < V
CHG
+ V
FAST-CHARGE
I
CHG
V
NOT READY
3 3 E
CHG = LOW
CHG = LOW
BAT
RSTRT
I
I
I
CHG
CHG
CHG
< V
≤ I
TOP-OFF
BAT
DONE
≤ I
= V
CHGMAX
BAT
= 0mA
= 0mA
= I
< V
CHGMAX
< V
TIMER > t
BATREG
TERM
< V
BATPQ
BAT
BATREG
/10
UOK AND/OR DOK = LOW
CEN = 0
RESET TIMER
< V
V
RESET TIMER
BAT
TOP-OFF
While in fast-charge mode, a large system load or device
self-heating may cause the MAX8903_ to reduce charge
current. Under these circumstances, the fast-charge
timer is slowed by 2x if the charge current drops below
50% of the programmed fast-charge level, and suspend-
ed if the charge current drops below 20% of the pro-
grammed level. The fast-charge timer is not affected at
any current if the charger is regulating the BAT voltage
at V
BATREG
> V
I
AND V
AND THERMAL
OR INPUT LIMIT
NOT EXCEEDED;
RESET TIMER
CHG
BATPQ
BATREG
< I
BAT
TERM
= V
CEN = HI OR
REMOVE AND RECONNECT
THE INPUT SOURCE(S)
BATREG
TIMER > t
V
(i.e., the charger is in voltage mode).
BAT
< V
RESET TIMER
BATREG
PREQUAL
+ V
RSTRT
TIMER > t
(TIMER SLOWED BY 2x IF
I
PAUSED IF I
CHG
REMOVE AND RECONNECT
THE INPUT SOURCE(S)
< I
UOK AND/OR DOK = LOW
CHG = HIGH IMPEDANCE
TOGGLE CEN OR
CHGMAX
ANY STATE
FSTCHG
CHG
FLT = LOW
I
CHG
FAULT
/2, AND
< I
= 0mA
CHGMAX
/5 WHILE V
BAT
< V
BATREG
)