MAX1645 Datasheet, PDF (9/32 Pages) Maxim Integrated Products – Advanced Chemistry-Independent, Level 2 Battery Chargers with Input Current Limiting

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