LTC4015_15 Datasheet, PDF (10/76 Pages) Linear Technology – Multichemistry Buck Battery Charger Controller with Digital Telemetry System

LTC4015
Typical Performance Characteristics T_A = 25°C, application circuit 1 unless
otherwise noted.
Lead-Acid Charging Profile
Voltage, Current vs Time
15.0
CHARGE VOLTAGE ^3.5
14.5
CHARGE CURRENT
3.0
14.0
13.5
13.0
12.5
CELLCOUNT = 6
12.0 R_SNSI = 0.007Ω
R_SNSB = 0.010Ω
11.5 _{VABSORB = 2.4V/CELL}
11.0 ^{VCHARGE = 2.2V/CELL}
0
50
100 150
TIME (MINUTES)
2.5
2.0
1.5
1.0
0.5
0
200 250
4015 G01
Li-Ion Charging Profile
Voltage, Current vs Time
8.6
8
V_CHARGE = 4.2V/CELL
8.4
7
CELLCOUNT = 2
8.2
6
5
8.0
4
7.8
3
7.6
2
7.4
CHARGE VOLTAGE
1
7.2
CHARGE CURRENT
0
0 15 30 45 60 75 90 105 120 135
TIME (MINUTES)
4015 G02
LiFePO₄ Charging Profile
Voltage, Current vs Time
15.0
8
V_CHARGE = 3.6V/CELL
14.5 CELLCOUNT = 4
7
14.0
6
13.5
5
13.0
4
12.5
3
12.0
2
11.5
11.0
0
CHARGE VOLTAGE
1
CHARGE CURRENT
0
15 30 45 60 75 90 105 120 135
TIME (MINUTES)
4015 G03
V_IN (Resistive), MPPT Enabled
Charger On/Off
30
V_IN RESISTANCE 4.5Ω
25
V_IN, MPPT ENABLED
V_IN/2, CHARGER OFF
V_BAT + 1V
20
V_CHARGE = 4.2V/CELL
V_BAT HELD AT 6.6V
15
10
5
0
10
15
20
25
30
35
V_IN, CHARGER OFF (V)
4015 G04
Li-Ion Charging Efficiency vs V_IN
96
94
92
90
88
86
V_BAT HELD AT 7.4V
84 CELLCOUNT = 2
I_CHARGE = 0.75A
82
I_CHARGE = 4A
I_CHARGE = 8A
80
10
15
20
V_IN (V)
25
30
4015 G05
Lead-Acid Charging Efficiency
vs I_CHARGE
100
95
I_CHARGE
90
85
80
75
V_IN = 24V
V_BAT HELD AT 12.2V
CELLCOUNT = 6
70
01 2345678
I_CHARGE (A)
4015 G06
LiFePO₄ Charging Efficiency
vs I_CHARGE
98
96
I_CHARGE
94
92
90
88
86
V_IN = 30V
V_BAT HELD AT 23.5V
CELLCOUNT = 7
84
0 1 23 45 67 8
I_CHARGE (A)
4015 G07
Charge Voltage (CV Mode)
vs Junction Temperature
8.405
8.400
8.395
8.390
8.385
8.380
I_CHARGE = 0
I_CHARGE = 100mA
8.375
Li-Ion 4.2V/CELL CHARGE VOLTAGE
V_IN = 12V
CELLCOUNT = 2
8.370
–50 –30 –10 10 30 50 70 90 110 130
JUNCTION TEMPERATURE (°C)
4015 G08
V_RSNSB Current (CC Mode)
vs Junction Temperature
32.02
0.25
32.00
0.00
31.98
–0.25
31.96
–0.50
31.94
–0.75
31.92
31.90
FULL-SCALE V_RSNSB
ERROR FROM 25°C
–1.00
–1.25
Li-Ion 4.2V/CELL CHARGE VOLTAGE
31.88 _{VIN = 12.V, VBAT = 8V}
–1.50
31.86 ^{CELLCOUNT = 2}
–1.75
–50 –30 –10 10 30 50 70 90 110 130
JUNCTION TEMPERATURE (°C)
4015 G09
4015f
10
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