Datasheet

LT3971A/LT3971A-5
7
3971af
TYPICAL PERFORMANCE CHARACTERISTICS
Switching Waveforms; Full
Frequency Continuous Operation
Switching Waveforms;
Burst Mode Operation
T
A
= 25°C, unless otherwise noted.
5µs/DIV
3971A G28
V
SW
5V/DIV
V
OUT
20mV/DIV
I
L
500mA/DIV
V
IN
= 12V, V
OUT
= 3.3V
I
LOAD
= 10mA
C
OUT
= 22µF
1µs/DIV
3971A G29
V
SW
5V/DIV
V
OUT
20mV/DIV
I
L
500mA/DIV
V
IN
= 12V, V
OUT
= 3.3V
I
LOAD
= 1A
C
OUT
= 22µF
TEMPERATURE (°C)
INPUT VOLTAGE (V)
3971A G35
5
1
2
3
4
–55 65 95 125 155355–25
3.3V Start-Up and Dropout
3.3V Start-Up and Dropout 5V Start-Up and Dropout
5V Start-Up and Dropout
Feedback Regulation Voltage
Minimum Input Voltage to Switch
INPUT VOLTAGE (V)
FEEDBACK VOLTAGE (V)
3971A G34
1.6
0
0.4
0.8
1.2
2 4 4.5 53.532.5
0.5s/DIV
3971A G30
1V/DIV
V
IN
V
OUT
800kHz
3k LOAD
0.5s/DIV
3971A G31
1V/DIV
V
IN
V
OUT
800kHz
6.7k LOAD
0.5s/DIV
3971A G32
1V/DIV
V
IN
V
OUT
800kHz
5k LOAD
0.5s/DIV
3971A G33
1V/DIV
V
IN
V
OUT
800kHz
10 LOAD