SMBus Level 2 Battery Charger
with Remote Sense
Typical Operating Characteristics (continued)
(Circuit of Figure 1, adapter = 19.5V, ChargeVoltage() = 16.8V, ChargeCurrent() = 3.854A, InputCurrent() = 3.584A, T = +25°C,
A
unless otherwise noted.)
LDO LINE REGULATION
REF LOAD REGULATION
REF ERROR vs. TEMPERATURE
0
-1
-2
-3
-4
-5
-6
0.20
0.15
0.10
0.05
0
0.3
0.2
0.1
0
NOT SWITCHING
-0.05
-0.10
-0.15
-0.20
-0.1
-0.2
-0.3
NOT SWITCHING
8
13
18
23
0
0.2
0.4
I
0.6
(mA)
0.8
1.0
-40
-20
0
20
40
60
80
V
(V)
TEMPERATURE (°C)
DCIN
REF
BATTERY-CHARGE CURVE
SWITCHING FREQUENCY
MAX8731A toc20
5
4
3
2
1
0
13.0
12.5
12.0
11.5
11.0
10.5
10.0
450
2.8Ah x 3S3P BATTERY
400
350
300
250
200
150
BATTERY VOLTAGE
CHARGE CURRENT
0
1
2
3
4
5
6
0
5
10
- V
15
(V)
20
TIME (h)
V
ADAPTER
BATTERY
ADAPTER CURRENT
vs. ADAPTER VOLTAGE
BATTERY-LEAKAGE CURRENT
vs. BATTERY VOLTAGE
3.0
2.5
2.0
1.5
1.0
0.5
0
2.5
2.0
1.5
1.0
0.5
0
ADAPTER PRESENT OR ABSENT
SWITCHING, NO LOAD
ChargeVoltage( ) = 4.192V
NOT SWITCHING
0
5
10
15
20
25
30
0
5
10
15
20
ADAPTER VOLTAGE (V)
BATTERY VOLTAGE (V)
12 ______________________________________________________________________________________
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
