Datasheet

4
LT3420/LT3420-1
3420fb
Output Voltage in Refresh Mode,
LT3420-1
TEMPERATURE (°C)
–50
V
OUT
(V)
100
3420 G04
050
335
330
325
320
315
310
305
300
295
–25 25 75 125
FIGURE 2 CIRCUIT
V
CC
= 3.3V
V
BAT
= 3.3V
V
IN
(V)
2.5
V
OUT
(V)
5.5
3420 G05
5.03.0 4.03.5 4.5 6.0
FIGURE 2 CIRCUIT
V
CC
= V
IN
V
BAT
= V
IN
T
A
= 25°C
335
330
325
320
315
310
305
300
295
V
BAT
(V)
2
TIME (s)
6
3420 G06
3
4
5
10
8
6
4
2
0
FIGURE 2 CIRCUIT
V
OUT
CHARGED
FROM 50V TO 320V
T
A
= 25°C
C
OUT
= 100µF
C
OUT
= 40µF
Output Voltage in Refresh Mode,
LT3420-1
Charge Pin Input Current
Primary Current Limit, LT3420
Secondary Current Limit, LT3420
Charge Time, LT3420-1
CHARGE PIN VOLTAGE (V)
2
CURRENT (µA)
10
8
6
4
2
0
57 10
3420 G07
34
6
89
T
A
= 25°C
TEMPERATURE (°C)
–50
CURRENT (A)
3420 G08
0
50
100
1.7
1.5
1.3
1.1
0.9
–25 25 75
125
TEMPERATURE (°C)
–50
CURRENT (mA)
100
3420 G09
050
60
55
50
45
40
35
30
25
20
–25 25 75 125
Efficiency of Figure 1 Circuit,
LT3420
Primary Current Limit, LT3420-1
Secondary Current Limit, LT3420-1
EFFICIENCY (%)
3420 G10
90
80
70
60
50
40
V
OUT
(V)
100 200 300
50 150 350250
V
CC
= V
BAT
= V
IN
V
IN
= 3.3V
V
IN
= 5V
T
A
= 25°C
TEMPERATURE (°C)
–50
CURRENT (A)
3420 G11
0
50
100
1.2
1.1
1.0
0.9
0.8
–25 25 75
125
TEMPERATURE (°C)
–50
CURRENT (mA)
100
3420 G12
050
35
30
25
20
15
10
5
–25 25 75 125
Graphs apply to both the LT3420 and LT3420-1 unless otherwise noted.
TYPICAL PERFOR A CE CHARACTERISTICS
UW