Datasheet
LT3505
6
3505fc
TYPICAL PERFORMANCE CHARACTERISTICS
Switch Current Limit
Typical Minimum On Time
R
T
Pin Bias Voltage
Operating Waveforms
Operating Waveforms,
Discontinuous Mode
TEMPERATURE (°C)
–50
1.0
SWITCH CURRENT LIMIT (A)
1.1
1.3
1.4
1.5
2.0
1.7
0 25 100 125
1.2
1.8
1.9
1.6
–25 50 75
Switch Current Limit, R
T
= 75.0k
TEMPERATURE (°C)
–50
MINIMUM ON TIME (ns)
80
120
125
40
0
0
50
100
–25
25
75
160
60
100
20
140
Switching Frequency Switching Frequency
TEMPERATURE(°C)
–50
BIAS VOLTAGE (mV)
495
500
505
25 75 125
490
485
480
–25 0
50
100
V
FB
= 0.78V
R
T
PIN BIAS CURRENT (µA)
0
0
SWITCHING FREQUENCY (MHz)
0.5
1.5
2.0
2.5
20
35
3.0
1.0
10 30
5
25
15
T
A
= 25°C
R
T
PIN RESISTANCE (kΩ)
10
0.1
SWITCHING FREQUENCY (MHz)
1
100
3505 G24
T
A
= 25°C
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
V
SW
5V/DIV
I
L
0.5A/DIV
0
V
OUT
20mV/DIV
1µs/DIV
3505 F26
V
IN
= 12V
V
OUT
= 3.3V
I
OUT
= 50mA
L = 10µH
C
OUT
= 10µF
R
T
= 75.0k
DUTY CYCLE (%)
1.2
SWITCH CURRENT LIMIT (A)
1.4
1.6
1.8
1.3
1.5
1.7
20 40 60 80
3505 G20
1000 30 50 70 9010
T
A
= 25°C
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