MAX8731 Maxim Integrated Products, MAX8731 Datasheet - Page 10

• 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.)
10
-0.2
-0.4
-0.6
-0.8
-1.0
1.0
0.8
0.6
0.4
0.2
-10
-2
-4
-6
10
-2
-4
-6
-8
6
4
2
0
0
______________________________________________________________________________________
8
6
4
2
0
0
0
0
INPUT CURRENT LIMIT = 2.048A
OPERATING AT INPUT CURRENT LIMIT
vs. INPUT CURRENT-LIMIT SETTING
IINP ERROR vs. SYSTEM CURRENT
CHARGE CURRENT-LIMIT SETTING
0.5
TYPICAL
INPUT CURRENT-LIMIT ERROR
CHARGE-CURRENT ERROR vs.
INPUT CURRENT-LIMIT SETTING (A)
2
CHARGE-CURRENT SETTING (A)
TYPICAL
1.0
2
INPUT CURRENT LIMIT = 3.584A
SYSTEM CURRENT (A)
INPUT CURRENT LIMIT = 4.096A
1.5
4
2.0
4
MAXIMUM
6
MINIMUM
2.5
MINIMUM
MAXIMUM
8
3.0
6
3.5
10
4.0
8
-0.2
-0.4
0.4
0.2
2.5
2.0
1.5
1.0
0.5
-2
-4
4
2
0
0
0
3
0
0
INPUT CURRENT LIMIT = 3.584A
V
IINP ERROR vs. SYSTEM CURRENT
BATT
INPUT CURRENT-LIMIT ERROR
INPUT CURRENT LIMIT = 2.048A
V
CHARGE-CURRENT ERROR
= 8.4V
3.072A
BATT
6
vs. BATTERY VOLTAGE
vs. SYSTEM CURRENT
1
1
BATTERY VOLTAGE (V)
SYSTEM CURRENT (A)
= 12.6V
INPUT CURRENT LIMIT = 3.584A
SYSTEM CURRENT (A)
V
BATT
9
3.968A
= 16.8V
2
2
Typical Operating Characteristics
12
INPUT CURRENT
LIMIT = 4.096A
8.064A
3
3
15
18
4
4
-0.2
-0.4
-0.6
-0.8
-1.0
1.0
0.8
0.6
0.4
0.2
-10
-10
-15
-20
-25
-30
10
-2
-4
-6
-8
-5
0
8
6
4
2
0
0
0
0
0
INPUT CURRENT LIMIT = 3.584A
TRICKLE-CHARGE CURRENT ERROR
NOT SWITCHING
IINP ERROR vs. INPUT CURRENT
V
INPUT CURRENT-LIMIT ERROR
BATT
TYPICAL
1
3
vs. SYSTEM CURRENT
vs. BATTERY VOLTAGE
= 12.6V
1
SYSTEM CURRENT (A)
BATTERY VOLTAGE (V)
INPUT CURRENT (A)
2
6
ChargeCurrent( ) = 128mA
V
2
9
3
BATT
V
BATT
= 16.8V
MAXIMUM
MINIMUM
12
4
= 8.4V
A
3
= +25°C,
15
5
18
4
6