Datasheet

LT3759
5
3759fc
For more information www.linear.com/3759
TYPICAL PERFORMANCE CHARACTERISTICS
Dynamic Quiescent Current
vs Switching Frequency R
T
vs Switching Frequency
Normalized Switching Frequency
vs FBX Voltage
Switching Frequency
vs Temperature
SENSE Current Limit Threshold
vs Temperature
SENSE Current Limit Threshold
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
3759 G04
10
200 400
800
5
0
I
Q
(V
IN
)
I
Q
(DRIVE)
C
L
= 3300pF, DRIVE = 6V
SWITCHING FREQUENCY (kHz)
0
R
T
(k)
60
50
80
70
100
90
600 1000
3759 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
3759 G06
40
–0.4
0.8
0 0.4
1.2
20
0
TEMPERATURE (°C)
–75
FBX REGULATION VOLTAGE (V)
1.61
1.62
0 150
3759 G01
1.60
–50 –25
25 50 75 100 125
1.59
1.58
TEMPERATURE (°C)
–75
FBX REGULATION VOLTAGE (V)
–0.79
–0.78
0 150
3759 G02
–0.80
–50 –25
25 50 75 100 125
–0.81
–0.82
TEMPERATURE (°C)
–75
I
Q
(mA)
2.2
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
0 150
3759 G03
–50 –25
25 50 75 100 125
I
Q
(DRIVE)
I
Q
(V
IN
)
V
IN
= 12V
DRIVE = 6V
TEMPERATURE (°C)
–75
SENSE THRESHOLD (mV)
53
52
51
50
49
48
47
0 150
3759 G08
–50 –25
25 50 75 100 125
DUTY CYCLE (%)
0
SENSE THRESHOLD (mV)
50
48
51
53
52
100
3759 G09
49
20
60
40
80
47
TEMPERATURE (°C)
–75
SWITCHING FREQUENCY (kHz)
350
325
300
275
250
0 150
3759 G07
–50 –25
25 50 75 100 125
R
T
= 27.4k
T
A
= 25°C, unless otherwise noted.
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