LT3505
TYPICAL PERFORMANCE CHARACTERISTICS
Switch Current Limit
Switch Current Limit, RT = 75.0k
Typical Minimum On Time
2.0
1.9
1.8
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1.0
1.8
1.7
160
140
120
100
80
T
= 25°C
A
1.6
1.5
60
1.4
1.3
1.2
40
20
0
50
75
–50 –25
0
25
100 125
0
10 20 30 40 50 60 70 80 90 100
DUTY CYCLE (%)
–50 –25
0
25
50
75 100 125
TEMPERATURE (°C)
TEMPERATURE (°C)
3505 G20
RT Pin Bias Voltage
Switching Frequency
Switching Frequency
505
500
495
490
485
480
3.0
2.5
2.0
1.5
1.0
0.5
0
V
= 0.78V
T
A
= 25°C
FB
T
= 25°C
A
1
0.1
50
TEMPERATURE(°C)
–50 –25
0
25
75 100 125
10
100
PIN RESISTANCE (kΩ)
0
5
35
10
15
20
25
30
R
R
T
PIN BIAS CURRENT (µA)
T
3505 G24
Operating Waveforms,
Discontinuous Mode
Operating Waveforms
V
V
SW
5V/DIV
SW
5V/DIV
I
L
I
L
0.5A/DIV
0.5A/DIV
0
0
V
V
OUT
OUT
20mV/DIV
20mV/DIV
3505 G18
3505 F26
V
V
= 12V
1µs/DIV
V
V
= 12V
IN
1µs/DIV
IN
= 3.3V
OUT
= 0.5A
OUT
= 3.3V
OUT
OUT
I
I
= 50mA
L = 10µH
C
R
L = 10µH
= 10µF
C
= 10µF
OUT
OUT
= 75.0k
R = 75.0k
T
T
3505fc
6
Linear [ Linear ]
