Rainbow Electronics MAX1873 - Manual (Page 6)

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 1.5 0.5 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 + 0.068 Ω
0
1.0
0.5
2.5
2.0
1.5
4.0
3.5
3.0
4.5
0 100 50 150 200 250
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
0 2 1 3 4 5
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
0 0.4 0.3 0.1 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
8 16 12 20 24 28
MAX1873R (2-CELL)
EFFICIENCY vs. INPUT VOLTAGE
MAX1873 toc06
INPUT VOLTAGE (V)
EFFICIENCY (%)
V BATT = 7V
I CHG = 3A