Datasheet

MAX1873
Simple Current-Limited Switch-Mode
Li+ Charger Controller
6 _______________________________________________________________________________________
Typical Operating Characteristics
(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
= +25°C, unless otherwise noted).
0
5.0
2.5
10.0
7.5
15.0
12.5
17.5
0 1.0 1.50.5 2.0 2.5 3.0 3.5
MAX1873T (4-CELL)
BATTERY VOLTAGE vs. CHARGING CURRENT
MAX1873 toc01
CHARGING CURRENT (A)
BATTERY VOLTAGE (V)
R
CSB
+ 0.068Ω
0
1.0
0.5
2.5
2.0
1.5
4.0
3.5
3.0
4.5
0 10050 150 200 250
IOUT VOLTAGE
vs. CSB-BATT VOLTAGE
MAX1873 toc02
CSB-BATT VOLTAGE (mV)
IOUT VOLTAGE (V)
4.180
4.190
4.185
4.200
4.195
4.205
4.210
RECENT VOLTAGE VS. TEMPERATURE
MAX1873 toc04
TEMPERATURE (°C)
REFERENCE VOLTAGE (V)
-50 0 25-25 50 75 100
MAX1873T
15.5
16.0
17.0
16.5
17.5
18.0
021345
MAX1873T (4-CELL)
BATTERY REGULATION VOLTAGE
vs. VADJ VOLTAGE
MAX1873 toc03
VADJ VOLTAGE (V)
BATTERY REGULATION VOLTAGE (V)
4.180
4.195
4.190
4.185
4.200
4.205
4.210
00.40.30.1 0.2 0.5 0.6 0.7 0.8 0.9 1.0
RECENT VOLTAGE
VS. REFERENCE CURRENT
MAX1873 toc05
REFERENCE VOLTAGE (mA)
REFERENCE VOLTAGE (V)
MAX1873T
50
60
80
70
90
100
81612 20 24 28
MAX1873R (2-CELL)
EFFICIENCY vs. INPUT VOLTAGE
MAX1873 toc06
INPUT VOLTAGE (V)
EFFICIENCY (%)
V
BATT
= 7V
I
CHG
= 3A