Datasheet

7
LT3437
3437fc
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Burst Mode Operation
Burst Mode Defeated
V
OUT
20mV/DIV
AC COUPLED
I
SW
100mA/DIV
V
IN
= 12V 10µs/DIV 3437 G23
V
OUT
= 3.3V
I
Q
= 100µA
V
OUT
20mV/DIV
AC COUPLED
I
SW
100mA/DIV
10µs/DIV
3437 G24
Step Response Step Response
V
OUT
50mV/DIV
I
OUT
100mA/DIV
1ms/DIV
3437 G25
LOAD STEP 0mA TO 200mA
V
OUT
50mV/DIV
I
OUT
100mA/DIV
1ms/DIV 3437 G26
LOAD STEP 100mA TO 300mA
Maximum Duty Cycle
vs Temperature
MAXIMUM DUTY CYCLE (%)
3437 G20
94.0
91.5
94.5
93.0
93.5
92.0
92.5
TEMPERATURE (°C)
I
LOAD
= 250mA
–50 0 50 75–25 25 100 150125
V
C
Switching Threshold
vs Temperature
Maximum Sync Frequency
vs Temperature
V
C
VOLTAGE (V)
3437 G21
0.5
0
0.6
0.3
0.4
0.1
0.2
TEMPERATURE (°C)
–50 0 50 75–25 25 100 150125
–50 0 50 75–25 25 100 150125
MAXIMUM SYNC FREQUENCY (kHz)
3437 G22
600
400
1600
900
1000
1200
1400
1100
1300
1500
700
800
500
TEMPERATURE (°C)
V
IN
= 12V
V
OUT
= 3.3V
I
OUT
= 100mA
Dropout Operation
INPUT VOLTAGE (V)
2.0
0
4
OUTPUT VOLTAGE (V)
1
2
3
4.0
6
3437 G19
3.0
2.5
3.5
5.0
4.5 6.05.5
5
V
OUT
= 5V
I
LOAD
= 250mA
BOOST DIODE = DIODES INC B1100
V
IN
= 12V
V
OUT
= 3.3V
I
Q
= 1.7mA
V
SYNC
= 3.3V