LTC4015_15 Datasheet, PDF (11/76 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.
V_RSNSI Charging (ICL Mode) vs
Junction Temperature
32.02
0.25
32.00
0.00
31.98
–0.25
31.96
–0.50
31.94
31.92
V_RSNSI
ERROR FROM 25°C
–0.75
–1.00
31.90 _{Li-Ion 4.2V/CELL VCHARGE}
31.88
V_IN = 12V, V_BAT = 7.4V
SYSTEM LOAD = 7A
–1.25
–1.50
CELLCOUNT = 2
31.86
–1.75
–50 –30 –10 10 30 50 70 90 110 130
JUNCTION TEMPERATURE (°C)
4015 G10
UVCLFB Voltage (UVCL Mode) vs
Junction Temperature
1.2005
1.1999
UVCLFB, FULL-SCALE
1.1994
1.1988
1.1982
1.1976 _{Li-Ion 4.2V/CELL VCHARGE}
1.1971
V_IN = 12V, V_BAT = 7.4V
V_IN RESISTANCE 2Ω
CELLCOUNT = 2
1.1965
–50 –30 –10 10 30 50 70 90 110 130
JUNCTION TEMPERATURE (°C)
4015 G11
Input Current Limiting I_IN and
I_CHARGE vs System Load
20
I_IN, V_IN = 12V
I_CHARGE, V_IN = 12V
16
I_IN, V_IN = 24V
I_CHARGE, V_IN = 24V
I_IN, V_IN = 35V
12
I_CHARGE, V_IN = 35V
8
4
0
0
2
4
6
8 10 12
SYSTEM LOAD (A)
4015 G12
RT Oscillator Frequency vs
Junction Temperature
503
R_T = 95.3k
502
501
500
499
498
497
496
495
–50 –30 –10 10 30 50 70 90 110 130
JUNCTION TEMPERATURE (°C)
4015 G13
Battery Discharge Current vs
Battery Voltage
300
T = 125°C
250
Battery Charger Soft-Start
(I_CHARGE vs Time)
200
I_CHARGE
T = 60°C
2A/DIV
150
T = 25°C
100
T = –45°C
50
V_IN = 0
COULOMB COUNTER OFF
0
0 5 10 15 20 25
BATTERY VOLTAGE (V)
30 35
4015 G14
2ms/DIV
I_CHARGE MAX = 8A
R_SNSB = 0.004Ω
4015 G15
Gate Drive Non-Overlap
(Transient)
V_SW
2V/DIV
TG, BG NON OVERLAP
V_IN = 12V
V_BAT = 7.4V
200ns/DIV
V_IN Hot Plug, 0 to 24V, 4-Cell
LiFePO₄
Battery Hot Plug, 0 to 11V, 4-Cell
LiFePO₄
IIN
20A/DIV
IBAT
20A/DIV
VBAT
5V/DIV
VIN
5V/DIV
IIN
VIN
IBAT = GREEN
VBAT
500µs/DIV
IBAT
20A/DIV
IBAT
VBAT
5V/DIV
VSYS
5V/DIV
4015 G17
VBAT = BLUE
VSYS = RED
200µs/DIV
4015 G18
4015 G16
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4015f
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