Datasheet

LT3481
6
3481fc
TEMPERATURE (°C)
–50
THRESHOLD VOLTAGE (V)
1.50
2.00
2.50
25 75 125 150
3481 G22
1.00
0.50
0
–25 0 50 100
CURRENT LIMIT CLAMP
SWITCHING THRESHOLD
V
C
Voltages
3481 G24
I
L
0.5A/DIV
V
SW
5V/DIV
V
OUT
10mV/DIV
5μs/DIV
V
IN
= 12V; FRONT PAGE APPLICATION
I
LOAD
= 10mA
FB PIN VOLTAGE (V)
1.065
–80
V
C
PIN CURRENT (μA)
–60
–20
0
20
1?.265 1.465
100
3481 G19
–40
1.165 1.365
40
60
80
LOAD CURRENT (A)
0.001
INPUT VOLTAGE (V)
3.0
3.5
10
3481 G20
2.5
2.0
0.01
0.1
1
4.5
4.0
V
OUT
= 3.3V
T
A
= 25°C
L = 4.7μH
f = 800kHz
LOAD CURRENT (A)
0.001
INPUT VOLTAGE (V)
5.0
5.5
10
3481 G21
4.5
4.0
0.01
0.1
1
6.5
6.0
V
OUT
= 5.0V
T
A
= 25°C
L = 4.7μH
f = 800kHz
TEMPERATURE (°C)
–50
THRESHOLD VOLTAGE (V)
1.160
1.180
1.200
25 75 150
3481 G23
1.140
1.120
1.100
–25 0 50 100 125
PG RISING
3481 G25
I
L
0.5A/DIV
V
RUN/SS
5V/DIV
V
OUT
10mV/DIV
V
IN
= 12V; FRONT PAGE APPLICATION
I
LOAD
= 140mA
1μs/DIV
3481 G26
I
L
0.5A/DIV
V
RUN/SS
5V/DIV
V
OUT
10mV/DIV
V
IN
= 12V; FRONT PAGE APPLICATION
I
LOAD
= 1A
1μs/DIV
Error Amp Output Current
Minimum Input Voltage
Minimum Input Voltage
Power Good Threshold
Switching Waveforms; Transition
from Burst Mode Operation to
Full Frequency
Switching Waveforms; Full
Frequency Continuous Operation
Switching Waveforms;
Burst Mode Operation
TYPICAL PERFORMANCE CHARACTERISTICS