LTC4012-3_15 Datasheet, PDF (6/28 Pages) Linear Technology – High Efficiency, Multi-Chemistry Battery Charger with PowerPath Control

LTC4012-3
Typical Performance Characteristics
(T_A = 25°C unless otherwise noted. L = IHLP-2525 6.8µH)
Charge Current Accuracy
2
1
0
–1
DCIN = 24V
R_PROG = 35.7k
–2
DCIN = 12V
R_PROG = 26.7k
–3
–4
–5
R_SENSE = 33mΩ
R_IN = 3.01k
–6
0 2 4 6 8 10 12 14 16 18 20 22 24
BAT (V)
4012-3 G07
Charge Current Line Regulation
0.5
BAT = 6V
0.4 _{RSENSE = 33mΩ}
0.3 ^{RIN = 3.01k}
0.2
I_CHG = 1A
0.1
0
I_CHG = 2A
–0.1
–0.2
I_CHG = 3A
–0.3
–0.4
–0.5
5
10
15
20
25
DCIN (V)
4012-3 G08
Charge Current Load Regulation
3.5
I_CHG = 3A
3.0
2.5
I_CHG = 2A
2.0
1.5
I_CHG = 1A
1.0
0.5
DCIN = 20V
0 _{RSENSE = 33mΩ}
–0.5 ^{RIN = 3.01k}
11.0 11.4 11.8 12.2
BAT (V)
12.6 13.0
4012-3 G09
Input Current Limit
3.0
2.5
I_IN
2.0
1.5
I_CHG
1.0
0.5 2.5A BULK CHARGE
2.1A INPUT CURRENT LIMIT
0
–0.5
–1.0
0
ICL STATE
0.5
1.0
1.5
2.0 2.5
SYSTEM LOAD (A)
4012-3 G10
PWM Soft-Start
I_CHG
2A/DIV
ITH
1V/DIV
PROG
1V/DIV
SHDN
5V/DIV
TIME (500µs/DIV)
4012-3 G11
Gate Drive Non-Overlap
BGATE
TGATE
TIME (80ns/DIV)
4012-3 G12
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