Datasheet

LT3959
5
3959fa
For more information www.linear.com/LT3959
Typical perForMance characTerisTics
Dynamic Quiescent Current
vs Switching Frequency R
T
vs Switching Frequency
Normalized Switching Frequency
vs FBX Voltage
Switching Frequency
vs Temperature SW Current Limit vs Temperature SW Current Limit vs Duty Cycle
FBX Positive Regulation Voltage
vs Temperature
FBX Negative Regulation Voltage
vs Temperature
Quiescent Current
vs Temperature
SWITCHING FREQUENCY (kHz)
0
I
Q
(mA)
15
20
25
600 1000
3959 G04
10
200 400
800
5
0
I
Q
(V
IN
)
I
Q
(DRIVE)
DRIVE = 6V
SWITCHING FREQUENCY (kHz)
0
R
T
(k)
60
50
80
70
100
90
600 1000
3959 G05
40
30
200100 400
800
700
300 500
900
20
10
0
FBX VOLTAGE (V)
–0.8
NORMALIZED FREQUENCY (%)
80
60
120
100
1.6
3959 G06
40
–0.4
0.8
0 0.4
1.2
20
0
TEMPERATURE (°C)
–50
FBX REGULATION VOLTAGE (V)
1.61
1.62
0 125
3959 G01
1.60
–25
25 50 75 100
1.59
1.58
TEMPERATURE (°C)
–50
FBX REGULATION VOLTAGE (V)
–0.79
–0.78
0 125
3959 G02
–0.80
–25
25 50 75 100
–0.81
–0.82
TEMPERATURE (°C)
–50
I
Q
(mA)
2.4
2.0
1.6
1.2
0.4
0.8
0.0
0 125
3959 G03
–25
25 50 75 100
I
Q
(V
IN
)
V
IN
= 12V
DRIVE = 6V
I
Q
(DRIVE)
TEMPERATURE (°C)
–50
SW CURRENT LIMIT (A)
7.6
7.4
7.2
7.0
6.8
6.6
6.4
0 125
3959 G08
–25 25 50 75 100
DUTY CYCLE (%)
0
SW CURRENT LIMIT (A)
6.5
5.5
7.0
8.0
7.5
100
3959 G09
6.0
20
60
40
80
5.0
TEMPERATURE (°C)
–50
SWITCHING FREQUENCY (kHz)
350
325
300
275
250
0 125
3959 G07
–25
25 50 75 100
T
A
= 25°C, unless otherwise noted.