Figure 4a. Charging Behavior Using Thermistor Monitoring Mode
Figure 4b. Charging Behavior Using JEITA Monitoring 1 and 2 Modes
MAX20335
PMIC with Ultra-Low I
Q
Voltage Regulators and
Battery Chargers for Small Lithium Ion Systems
www.maximintegrated.com
Maxim Integrated
│
34
T
1
T
4
TEMPERATURE (°C)
CHARGING
NO CHARGING
NO CHARGING
T
2
T
3
I
PCHG
PREQUAL:
V
BAT
<
V
BAT_PCHG
T
1
T
4
TEMPERATURE (°C)
CHARGING
NO CHARGING
NO CHARGING
T
2
T
3
I
FCHG_T1-T2
FAST CHARGE CONSTANT CURRENT:
V
BAT_PCHG
< V
BAT
< V
BAT_REG
I
FCHG_T2-T3
T
1
T
4
TEMPERATURE (°C)
CHARGING
NO CHARGING
T
2
T
3
V
BATREG
REGULATED VOLTAGE
R
THM
R
PA
R
PU
CAP
NO CHARGING
T
1
T
4
TEMPERATURE (°C)
CHARGING
NO
CHARGING
NO
CHARGING
T
2
T
3
T
1
T
4
TEMPERATURE (°C)
CHARGING
NO
CHARGING
NO
CHARGING
T
2
T
3
I
PCHG
V
BATREG
-150mV
-150mV
PREQUAL:
V
BAT
<
V
BAT_PCHG
(BOTH MODES)
T
1
T
4
TEMPERATURE (°C)
CHARGING
NO
CHARGING
NO
CHARGING
T
2
T
3
I
FCHG_T1-T2
FAST-CHARGE CONSTANT-CURRENT:
V
BAT_PCHG
< V
BAT
< V
BAT_REG
(BOTH MODES)
I
FCHG_T2-T3
I
FCHG_T3-T4
T
1
T
4
TEMPERATURE (°C)
CHARGING
NO
CHARGING
NO
CHARGING
T
2
T
3
V
BATREG
REGULATED VOLTAGE
(JEITA MONITORING 2)
REGULATED VOLTAGE
(JEITA MONITORING 1)