MAX1645-MAX1645A Maxim, MAX1645-MAX1645A Datasheet - Page 9

• Manufacturer Part Number: MAX1645-MAX1645A
• Description: Advanced Chemistry-Independent / Level 2 Battery Chargers with Input Current Limiting
• Manufacturer: Maxim

(Circuit of Figure 1, V
100
95
90
85
80
75
70
65
60
55
50
0
A: V
B: V
Battery Chargers with Input Current Limiting
EFFICIENCY vs. BATTERY CURRENT
DCIN
DCIN
500
(VOLTAGE-CONTROL LOOP)
= 20V, ChargingVoltage() = 16.8V
= 16V, ChargingVoltage() = 8.4V
Advanced Chemistry-Independent, Level 2
BATTERY CURRENT (mA)
1000
_______________________________________________________________________________________
DCIN
1500
-0.1
-0.2
-0.3
0.3
0.2
0.1
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
0
SOURCE/BATT CURRENT vs. LOAD CURRENT
0000
= 20V, T
0
I
MEASURED AT AVAILABLE CODES
V
R
V
SOURCE CURRENT LIMIT = 2.5A
ChargingCurrent() = 3008mA
ChargingVoltage() = 18,432mV
2000
BATT
CLS
CSS
BATT
WITH SOURCE CURRENT LIMIT
vs. ChargingVoltage() CODE
= 0
= 2V
= 40mΩ
4000
= 16.8V
0.5
2500
BATT VOLTAGE ERROR
ChargingVoltage() (CODE)
A
= +25°C, unless otherwise noted.)
LOAD CURRENT (A)
8000
3000
A
B
1.0
12000
I
1.5
IN
100
95
90
85
80
75
70
65
60
55
50
Typical Operating Characteristics (continued)
16000
0
A: V
B: V
2.0
I
EFFICIENCY vs. BATTERY CURRENT
BATT
DCIN
DCIN
500
(CURRENT-CONTROL LOOP)
20000
= 20V, V
= 16V, V
2.5
ChargingCurrent() (CODE)
1000
BATT
BATT
1500
= 16.8V
= 8.4V
3.5
3.0
2.5
2.0
1.5
1.0
0.5
-1
-2
-3
-4
-5
2000
5
4
3
2
1
0
0
0
0
I
V
R
ChargingVoltage() = 18,432mV
ChargingCurrent() = 3008mA
SOURCE CURRENT LIMIT = 2.5A
LOAD
CLS
CSS
SOURCE/BATT CURRENT vs. V
V
MEASURED AT AVAILABLE CODES
2500
2
BATT
WITH SOURCE CURRENT LIMIT
500
= 2V
vs. ChargingCurrent() CODE
= 40mΩ
= 2A
CURRENT-SETTING ERROR
4
= 12.6V
A
B
ChargingCurrent() (CODE)
3000
1000
6
8
V
BATT
1500
10 12 14 16 18 20
0.001
(V)
0.01
0.1
1.0
10
2000
I
IN
0
ChargingVoltage() = 16,800mV
ChargingCurrent() = 3008mA
2500
I
BATT
OUTPUT VI CHARACTERISTICS
500 1000
BATT
3000
LOAD CURRENT (mA)
1500 2000
2500 3000 3500
9