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