Datasheet
5Maxim Integrated
1.2A Switch-Mode Li+ Chargers with ±22V Input
Rating and JEITA Battery Temperature Monitoring
MAX8900A/MAX8900B/MAX8900C
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= 6V, V
BAT
= 4V, R
SETI
= 2.87kI, R
DNI
= 3.57kI, V
THM
= V
AVL/2
, circuit of Figure 1, T
A
= -40NC to +85NC, unless otherwise
noted. Typical values are at T
A
= +25NC.) (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Minimum On-Time t
ON-MIN
90 ns
Maximum On-Time t
ON-MAX
9
Fs
Minimum Off-Time t
OFF
75 ns
BAT Regulation Voltage (Note 3) V
BATREG
I
BAT
= 0mA,
MAX8900A/
MAX8900B/
MAX8900C
(Figure 10)
T
A
= +25NC, V
THM
between
T1 and T3
4.179 4.200 4.221
V
T
A
= -40NC to +85NC, V
THM
between T1 and T3
4.158 4.200 4.242
T
A
= +25NC, V
THM
between
T3 and T4 (Note 5)
4.055 4.075 4.095
T
A
= -40NC to +85NC, V
THM
between T3 and T4 (Note 5)
4.034 4.075 4.100
Charger Restart Threshold
(Note 6)
V
RSTRT
V
THM
between T1 and T3 -70 -100 -125
mV
V
THM
between T3 and T4 -75
BAT Prequalification Lower
Threshold (Figure 6)
V
PQLTH
V
BAT
rising,180mV hysteresis 2.1 V
BAT Prequalification Upper
Threshold (Figure 6) (Note 3)
V
PQUTH
V
BAT
rising, 180mV
typical hysteresis
MAX8900A/MAX8900B 2.7 2.8 2.9
V
MAX8900C 2.9 3.0 3.1
Fast-Charge Current I
FC
V
THM
between T2
and T4 (Figure 10)
R
SETI
= 2.87kI
1166 1190 1214
mA
R
SETI
= 6.81kI
490 500 510
R
SETI
= 34.0kI
99 101 103
V
THM
between T1 and T2 (Figure 10); the
fast-charge current is reduced to 50% the
value programmed by R
SETI
50 %
Fast-Charge Current Set Range (Figure 5)
Minimum 50
mA
Maximum 1200
Fast-Charge Setting Resistor
Range
R
SETI
(Figure 5)
Minimum 2.87
kI
Maximum 68.1
Done Current I
DN
V
THM
between T2
and T4 (Figure 10)
R
DNI
= 3.83kI (Note 5)
93 99 105
mA
R
DNI
= 7.68kI (Note 5)
47 50 53
R
DNI
= 38.3kI
9.5 10.5 11.5
V
THM
between T1 and T2 (Figure 10); the
done current threshold is reduced to 50%
the value programmed by R
DNI
50 %
Prequalification Current I
PQ
V
THM
between T2
and T4 (Figure 10),
V
BAT
= 2.6V
R
DNI
= 3.83kI (Note 5)
95 105 115
mA
R
DNI
= 7.68kI (Note 5)
49 54 59
R
DNI
= 38.3kI (Note 5)
10 11.5 13
V
THM
between T1 and T2 (Figure 10); the
prequalification current is reduced to 50%
the value programmed by R
DNI
50 %