Datasheet

25Maxim Integrated
1.2A Switch-Mode Li+ Chargers with ±22V Input
Rating and JEITA Battery Temperature Monitoring
MAX8900A/MAX8900B/MAX8900C
Table 2. Trip Temperatures for Different Thermistors
Figure 10. JEITA Battery Safety Regions
THERMISTOR TEMPERATURE
R
THRM
at T
A
= +25NC
10,000 10,000 10,000 47,000 47,000 100,000 100,000
Thermistor Beta (ß[I])
3380 3940 3940 4050 4050 4250 4250
RTB (I)
10,000 10,000 10,000 47,000 47,000 100,000 100,000
RTP (I)
OPEN OPEN 301,000 OPEN 1,200,000 OPEN 1,800,000
RTS (I)
SHORT SHORT 499 SHORT 2,400 SHORT 6,800
Resistance at T1_n15 (I)
61,788 61,788 77,248 290,410 380,716 617,913 934,027
Resistance at T1_0 (I)
29,308 29,308 31,971 137,750 153,211 293,090 343,283
Resistance at T2 (I)
15,000 15,000 15,288 70,500 72,500 150,002 156,836
Resistance at T3 (I)
5,309 5,309 4,906 24,954 23,083 53,093 47,906
Resistance at T4 (I)
2,910 2,910 2,439 13,676 11,434 29,099 22,777
Temperature at T1_n15 (NC) [-15NC nom]
-16.2 -11.1 -14.9 -10.2 -14.8 -8.7 -15.4
Temperature at T1_0 (NC) [0NC nom]
-0.8 2.6 0.9 3.2 1.2 4.1 1.3
Temperature at T2 (NC) [+15NC nom]
14.7 16.1 15.7 16.4 15.8 16.8 15.9
Temperature at T3 (NC) [+45NC nom]
42.6 40.0 42.0 39.6 41.5 38.8 41.2
Temperature at T4 (NC) [+60NC nom]
61.4 55.7 60.6 54.8 59.6 53.2 59.2
BATTERY TEMPERATURE (°C)
2515 45 60 85
3405V
BATTERY TEMPERATURE (°C)
4.2V
4.1V*
BAT REGULATION VOLTAGE (V)
4.2
4.1
4.0
-40
-40
T4T3T2T1
2515 45 60 85
T4T3T2T1
4.075V
*CONTACT FACTORY FOR A 4.1V
OPTION FOR V
BATREG
.
I
FC
=
3405V
R
SETI
T1 = 0°C for MAX8900A/MAX8900C
T1 = -15°C for MAX8900B
CHARGE CURRENT (A)
I
FC
=
2 x R
SETI
I
PQ
=
415V
2 x R
DNI
415V
R
DNI
I
PQ
=
I
DBAT