Max8730 low-cost battery charger, Typical operating characteristics – Rainbow Electronics MAX8730 User Manual
Page 10
MAX8730
Low-Cost Battery Charger
10
______________________________________________________________________________________
Typical Operating Characteristics
(Circuit of Figure 1, adapter = 19.5V, V
BATT
= 12V, V
ICTL
= 2.4V, MODE > 1.8V, REFON = INPON = LDO, V
RELTH
= V
REF
/2, T
A
=
+25°C, unless otherwise noted.)
TRICKLE-CHARGE CURRENT
vs. BATTERY VOLTAGE
BATTERY VOLTAGE (V)
TRICKLE-CHARGE-CURRENT ERROR (%)
MAX8730 toc07
0
3
6
9
12
15
18
-25
-20
-15
-10
-5
0
5
10
15
20
25
CHARGE CURRENT = 150mA
BATTERY-VOLTAGE ERROR
vs. CHARGE CURRENT
CHARGE CURRENT (A)
BATTERY-VOLTAGE ERROR (%)
MAX8730 toc08
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
-0.25
-0.20
-0.15
-0.10
-0.05
0
4 CELLS
3 CELLS
BATTERY-VOLTAGE ERROR vs. VCTL
VCTL (V)
CHARGE-VOLTAGE ERROR (%)
MAX8730 toc09
0
1.5
0.5
1.0
2.0
2.5
3.0
3.5
-1.0
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1.0
INPUT CURRENT-LIMIT ERROR vs. CLS
V
CLS
(V)
INPUT CURRENT-LIMIT ERROR (%)
MAX8730 toc01
1.1
1.6
2.1
2.6
3.1
3.6
4.1
-15
-10
-5
0
5
10
15
TYPICAL UNIT
MINIMUM
MAXIMUM
INPUT CURRENT-LIMIT ERROR
vs. SYSTEM CURRENT
SYSTEM CURRENT (A)
INPUT CURRENT-LIMIT ERROR (%)
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
V
IN
= 17V
V
IN
= 19V
V
IN
= 24V
V
CLS
= V
REF
x 0.7
INPUT CURRENT-LIMIT ERROR
vs. SYSTEM CURRENT
SYSTEM CURRENT (A)
INPUT CURRENT-LIMIT ERROR (%)
MAX8730 toc03
0
1
2
3
4
5
0
1
2
3
4
5
6
7
V
CLS
= V
REF
/ 2
V
CLS
= V
REF
x 0.7
V
CLS
= V
REF
IINP ERROR vs. V
CSSP
-
V
CSSN
MAX8730 toc04
V
CSSP
- V
CSSN
IINP ERROR (%)
90
80
70
60
50
40
30
20
10
-10
-5
0
5
10
15
-15
0
100
MINIMUM
MAXIMUM
CHARGE-CURRENT ERROR
vs. CHARGE-CURRENT SETTING
V
ICTL
(V)
CHARGE-CURRENT ERROR (%)
MAX8730 toc05
0
0.6
1.2
1.8
2.4
3.0
3.6
-20
-15
-10
-5
0
5
10
15
20
TYPICAL UNIT
MINIMUM ERROR
MAXIMUM ERROR
CHARGE-CURRENT ERROR
vs. BATTERY VOLTAGE
BATTERY VOLTAGE (V)
CHARGE-CURRENT ERROR (%)
MAX8730 toc06
0
5
10
15
20
-0.5
-0.2
0.1
0.4
0.7
1.0
1.3
1.6
V
ICTL
= 2V
V
ICTL
= 3.6V