Datasheet

LTC1960
6
1960fb
TYPICAL PERFORMANCE CHARACTERISTICS
Charger Efficiency Charger Start-Up Charger Load Dump
Charger Load Regulation Charging Current Accuracy
IDAC Low Current Mode
vs Normal Mode
Battery Drain Current
(BAT1 Selected) PowerPath Switching
PowerPath Autonomous
Switching
BAT1 VOLTAGE (V)
6
BAT1 CURRENT (µA)
30
1960 G01
12
18
24
250
240
230
220
210
200
190
180
170
160
150
T
A
= 25°C
TIME (µs)
16
15
14
13
12
11
10
9
8
7
6
LOAD VOLTAGE (V)
1960 G02
–50 –40 –30
–10
0
10 20 30 40 50
–20
C
LOAD
= 20µF
I
LOAD
= 0.8A
T
A
= 25°C
LOPWR
THRESHOLD
TIME (SEC)
–1
LOAD VOLTAGE (V)
0
1
2 3
1960 G03
4
16
15
14
13
12
11
10
9
8
7
6
5
BAT1
REMOVED
NOTE: LIGHT LOAD TO
EXAGGERATE SWITCHING EVENT
I
OUT
(A)
0
0
EFFICIENCY (%)
10
30
40
50
100
70
0.025
0.10
1960 G04
20
80
90
60
0.50
2.5 4.0
TIME (SEC)
–0.05
CHARGER OUTPUT (V)
0.05
0.15
0.20 0.40
1960 G05
0 0.10
0.25
0.30
0.35
12
10
8
6
4
2
0
TIME (ms)
–4 –2
BAT1 VOLTAGE (V)
14
12
10
8
6
4
2
0
1960 G06
42
10 12 14 16
0
6 8
V
IN
= 20V
VDAC = 12.29V
IDAC = 3000mA
LOAD CURRENT = 1A
T
A
= 25°C
BAT1
OUTPUT
LOAD
CONNECTED
LOAD
DISCONNECTED
CHARGE CURRENT (mA)
0
BAT1 VOLTAGE (V)
4000
1960 G07
1000 2000 3000
12.4
12.3
12.2
12.1
12.0
11.9
11.8
11.7
11.6
V
IN
= 20V
VDAC = 12.288V
IDAC = 4000mA
T
A
= 25°C
IDAC VALUE
0 200
OUTPUT CURRENT ERROR (mA)
400 800600
1000
1200
1960 G08
120
100
80
60
40
20
0
–20
–40
V
DCIN
= 20V
V
BAT1
= 12V
R
SNS
= 0.025Ω
T
A
= 25°C
PROGRAMMED CURRENT (mA)
0
CHARGING CURRENT (mA)
500
450
400
350
300
250
200
150
100
50
0
160
320
400
1960 G09
80
240
480
560
LOW CURRENT
MODE
NORMAL
MODE
V
IN
= 20V
V
BAT1
= 12V
R
SNS
= 0.025Ω
T
A
= 25°C