Datasheet

6 Maxim 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
Done and Prequalification
Current Set Range
(Figure 5)
Minimum 9.8
mA
Maximum 200
Done and Prequalification
Setting Resistor Range
R
DNI
(Figure 5)
Minimum 1.91
kI
Maximum 39.2
Dead-Battery Charge Current I
DBAT
0V P V
BAT
P V
DBAT
45 mA
Dead-Battery Voltage Threshold
(Figure 6)
V
DBAT
2.5 V
BAT Leakage Current
V
IN
= 0V, V
BAT
= 4.2V,
includes LX leakage current
through the inductor
T
A
= +25NC
0.02 1
FA
T
A
= +85NC
0.05
Charger Soft-Start Time (Note 3) t
SS
1.5 ms
CHARGE TIMER
Prequalification/Dead-Battery
Time
t
PQ
C
CT
= 0.1FF
30 min
Fast-Charge Time t
FC
C
CT
= 0.1FF
180 min
Top-Off Time t
TO
16 s
Timer Accuracy -15 +15 %
THERMISTOR MONITOR
THM Hot Shutoff Threshold
(60NC)
T4
V
THM
/AVL falling, 1% hysteresis
(thermistor temperature rising)
21.24 22.54 23.84 %AVL
THM Hot Voltage Foldback
Threshold (45NC)
T3
V
THM
/AVL falling, 1% hysteresis
(thermistor temperature rising)
32.68 34.68 36.68 %AVL
THM Cold Current Foldback
Threshold (15NC)
T2
V
THM
/AVL rising, 1% hysteresis
(thermistor temperature falling)
57.00 60.00 63.00 %AVL
THM Cold Shutoff Threshold
(-15NC/0NC)
T1
V
THM
/AVL rising, 1%
hysteresis (thermistor
temperature falling)
0NC, MAX8900A/
MAX8900C
71.06 74.56 78.06
%AVL
-15NC, MAX8900B
81.43 86.07 90.98
THM Input Leakage THM = GND or AVL
T
A
= +25NC
-0.2 0.001 +0.2
FA
T
A
= +85NC
0.001
CHARGE ENABLE INPUT (CEN)
CEN Input Voltage Low
V
IL
0.6 V
CEN Input Voltage High
V
IH
1.4 V
CEN Internal Pulldown Resistance
R
CEN
100 200 400
kI