Electrical characteristics (continued) – Rainbow Electronics MAX1873 User Manual
Page 3
MAX1873
Simple Current-Limited Switch-Mode
Li+ Charger Controller
_______________________________________________________________________________________
3
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V
DCIN
= V
CSSP
= V
CSSN
= 18V, V
ICHG/EN
= V
REF
, V
VADJ
= V
REF
/2. MAX1873R: V
BATT
= V
CSB
= 8.4V;
MAX1873S: V
BATT
= V
CSB
= 12.6V; MAX1873T: V
BATT
= V
CSB
= 16.8V; T
A
= 0°C to +85°C. Typical values are at T
A
= +25°C, unless
otherwise noted.)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
2-cell version MAX1873R
10.45
11
11.55
3-cell version MAX1873S
15.675
16.5
17.325
BATT Overvoltage Cutoff Threshold
4-cell version MAX1873T (Note 1)
17.575
18.5
19.425
V
V
VADJ
= 0
7.898
7.958
8.018
V
VADJ
= V
REF
/2
8.337
8.4
8.463
MAX1873R
(2 Li+ cells)
V
VADJ
= V
REF
(Note 1)
8.775
8.842
8.909
V
VADJ
= 0
11.847
11.937
12.027
V
VADJ
= V
REF
/2
12.505
12.6
12.695
MAX1873S
(3 Li+ cells)
V
VADJ
= V
REF
(Note 1)
13.163
13.263
13.363
V
VADJ
= 0
15.796
15.916
16.036
V
VADJ
= V
REF
/2
16.674
16.8
16.926
Battery Regulation Voltage
MAX1873T
(4 Li+ cells)
V
VADJ
= V
REF
(Note 1)
17.551
17.684
17.817
V
MAX1873R
4.8
5.0
5.2
MAX1873S
7.2
7.5
7.8
BATT Undervoltage Threshold
For I
CHG
/20 trickle
charge
MAX1873T
9.6
10
10.4
V
CURRENT SENSE
V
ICHG/EN
= V
REF
190
200
210
CSB to BATT Battery Current-Sense
Voltage
V
ICHG/EN
= V
REF
/4
40
50
60
mV
CSB to BATT Current-Sense Voltage
when V
BATT
< 2.5V per Cell
5
10
15
mV
CSSP to CSSN Current-Sense Voltage
6V < V
CSSP
< 28V
90
100
110
mV
CONTROL INPUTS/OUTPUTS
ICHG/EN Input Threshold
Includes 50mV of hysteresis
500
600
700
mV
ICHG/EN Input Voltage Range For
Charge Current Adjustment
700
V
REF
mV
VADJ Input Current
V
VADJ
= V
REF
/2
-100
100
nA
ICHG/EN Input Current
V
ICHG/EN
= V
REF
-100
100
nA
VADJ Input Voltage Range
0
V
REF
V
Full scale
V
CSB
- V
BATT
= 200mV,
0 < I
OUT
< 500µA
3.6
4.0
4.4
25% scale
V
CSB
- V
BATT
= 50mV,
0 < I
OUT
< 500µA
0.9
1.0
1.1
V
Trickle charge
V
CSB
- V
BATT
= 10mV
75
200
325
IOUT Voltage
No charge
current
V
CSB
- V
BATT
= 0,
I
IOUT
= sinking 20µA
40
70
90
mV