MAX1873 Maxim, MAX1873 Datasheet - Page 7

• Manufacturer Part Number: MAX1873
• Description: Simple Current-Limited Switch-Mode Li Charger Controller
• Manufacturer: Maxim

(Circuit of Figure 1, V
MAX1873S: V
BATT
100
90
80
70
60
50
18
16
14
12
10
8
6
4
= V
12
0
_______________________________________________________________________________________
DCIN
V
I
CSB
CHG
EFFICIENCY vs. INPUT VOLTAGE
BATT
4-CELL BATTERY VOLTAGE AND
CHARGING CURRENT vs. TIME
25
= 3A
= V
= 12.6V; MAX1873T: V
= 10.5V
16
MAX1873S (3-CELL)
CSSP
INPUT VOLTAGE (V)
50
Simple Current-Limited Switch-Mode
TIME (MINUTES)
BATTERY VOLTAGE
= V
20
CHARGING CURRENT
75
CSSN
100
24
= 18V, V
125
Typical Operating Characteristics (continued)
BATT
150
28
ICHG/EN
= V
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
CSB
= V
= 16.8V; T
REF
, V
Li+ Charger Controller
VADJ
A
= +25°C, unless otherwise noted).
100
3.0
2.5
2.0
1.5
1.0
0.5
= V
90
80
70
60
50
0
16
0
REF
V
I
CHG
BATT
EFFICIENCY vs. INPUT VOLTAGE
/2. MAX1873R: V
0.5
vs. SYSTEM LOAD CURRENT
18
+ 3A
= 14V
SYSTEM LOAD CURRENT (A)
CHARGING CURRENT
MAX1873T (4-CELL)
1.0
INPUT VOLTAGE (V)
20
1.5
22
BATT
2.0
24
= V
2.5
26
CSB
3.0
28
= 8.4V;
7