Datasheet

LT3572
4
3572fa
TYPICAL PERFORMANCE CHARACTERISTICS
Feedback Pin Voltage vs
Temperature
Oscillator Frequency vs
Temperature
SS Pin Current vs Temperature
Quiescent Current vs Temperature SHDN Pin Current vs Temperature
SW Current Limit vs Temperature
SW Saturation Voltage vs
Temperature
Start-Up
TEMPERATURE (°C)
–50
FEEDBACK VOLTAGE (V)
1.23
1.24
1.25
25 75 150
3572 G01
1.22
1.21
1.20
–25 0
50
100 125
TEMPERATURE (°C)
–50
FREQUENCY (MHz)
1.5
2.0
2.5
25 75 150
3572 G02
1.0
0.5
0
–25 0
50
100 125
RT = 13k
RT = 35k
TEMPERATURE (°C)
–50
SS PIN CURRENT (μA)
4
6
150
3572 G03
2
0
0
50
100
–25
25
75
125
8
3
5
1
7
TEMPERATURE (°C)
–50
QUIESCENT CURRENT (mA)
2.0
3.0
150
3572 G04
1.0
0
0
50
100
–25
25
75
125
4.0
1.5
2.5
0.5
3.5
TEMPERATURE (°C)
–50
0
SHDN PIN CURRENT (μA)
1
3
4
5
10
7
0
50
75
3572 G05
2
8
9
6
–25 25
100
125
150
V
SHDN
= 5V
V
SHDN
= 2.5V
TEMPERATURE (°C)
–50
PEAK CURRENT (A)
0.8
1.2
150
3572 G06
0.4
0
0
50
100
–25
25
75
125
1.6
0.6
1.0
0.2
1.4
TEMPERATURE (°C)
–50
0
SWITCH SATURATION VOLTAGE (V)
0.05
0.15
0.20
0.25
0.50
0.35
0
50
75
3572 G07
0.10
0.40
0.45
0.30
–25 25
100
125
150
I
SW
= 800mA
I
SW
= 400mA
I
IN
200mA/DIV
V
OUT
20V/DIV
V
OUTA
20V/DIV
PGOOD
5V/DIV
200μs/DIV
3572 G08