Datasheet
LT3509
5
3509fd
For more information www.linear.com/LT3509
FB Pin Voltage vs Temperature
f
SW
vs Temperature
(Measured at 1MHz)
Typical perForMance characTerisTics
I
LOAD
(A)
0
MAXIMUM V
IN
(V)
0.60.4 0.8
3509 G10
5
10
15
20
25
0
0.2
30
T
A
= 25ºC
T
A
= 85ºC
I
LOAD
(A)
0
MAXIMUM V
IN
(V)
3509 G11
5
10
15
20
25
0
45
30
35
40
T
A
= 25ºC
T
A
= 85ºC
0.60.4 0.8
0.2
Max V
IN
for Constant Frequency
V
OUT
= 3.3V, f
SW
= 2MHz
Max V
IN
for Constant Frequency
V
OUT
= 5V, f
SW
= 2MHz
Minimum On-Time vs
Temperature, I
LOAD
= 0.3A
DUTY CYCLE (%)
0 10
I
LIM
(A)
100
3509 G14
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
0
20 30
40 50 60
70 80 90
1.8
T
A
= 25ºC
I
LIM
vs Temperature
I
LIM
vs Duty Cycle
TEMPERATURE (°C)
–50
0.790
FEEDBACK PIN VOLTAGE (V)
0.795
0.800
0.805
0.810
–25 0 25 50
3509 G08
75 100 125 150
TEMPERATURE (˚C)
–50
NORMALIZED (f
SW
)
1.01
1.02
1.03
25 50 75 100 125
3509 G09
1.00
0.99
–25 0 150
0.98
0.97
1.04
TEMPERATURE (°C)
–50
MINIMUM ON-TIME (ns)
80
120
150
3509 G12
40
0
0
50
100
–25
25
75
125
160
60
100
20
140
TEMPERATURE (°C)
–50
I
LIM
(A)
1.0
1.3
1.5
25 75 150
3509 G13
0.9
0.7
0.5
–25 0
50
100 125
SWITCH
DA
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