MAX8731 Maxim Integrated Products, MAX8731 Datasheet - Page 12

• Manufacturer Part Number: MAX8731
• Description: SMBus Level 2 Battery Charger
• Manufacturer: Maxim Integrated Products

SMBus Level 2 Battery Charger with
Remote Sense
(Circuit of Figure 1, adapter = 19.5V, ChargeVoltage() = 16.8V, ChargeCurrent() = 3.854A, InputCurrent() = 3.584A, T
unless otherwise noted.)
12
-1
-2
-3
-4
-5
-6
0
______________________________________________________________________________________
8
LDO LINE REGULATION
13
450
400
350
300
250
200
150
3.0
2.5
2.0
1.5
1.0
0.5
0
V
DCIN
0
0
SWITCHING, NO LOAD
18
(V)
NOT SWITCHING
5
SWITCHING FREQUENCY
vs. ADAPTER VOLTAGE
5
ADAPTER CURRENT
V
ADAPTER VOLTAGE (V)
ADAPTER
10
ChargeVoltage( ) = 4.192V
23
- V
10
15
BATTERY
NOT SWITCHING
20
(V)
15
-0.05
-0.10
-0.15
-0.20
0.20
0.15
0.10
0.05
Typical Operating Characteristics (continued)
25
0
0
20
30
0.2
REF LOAD REGULATION
0.4
I
REF
(mA)
0.6
NOT SWITCHING
2.5
2.0
1.5
1.0
0.5
5
4
3
2
1
0
0
0.8
0
0
2.8Ah x 3S3P BATTERY
ADAPTER PRESENT OR ABSENT
BATTERY-LEAKAGE CURRENT
1
BATTERY-CHARGE CURVE
1.0
vs. BATTERY VOLTAGE
5
BATTERY VOLTAGE (V)
2
TIME (h)
-0.1
-0.2
-0.3
0.3
0.2
0.1
0.0
3
10
BATTERY VOLTAGE
CHARGE CURRENT
-40
4
REF ERROR vs. TEMPERATURE
-20
15
MAX8731 toc20
5
TEMPERATURE (°C)
0
6
20
20
13.0
12.5
12.0
11.5
11.0
10.5
10.0
40
A
60
= +25°C,
80