LT3592
TYPICAL PERFORMANCE CHARACTERISTICS
Undervoltage Lockout
vs Temperature
3.4
2300
2100
UNDERVOLTAGE LOCKOUT (V)
1900
3.3
f
SW
(kHz)
1700
1500
1300
1100
900
700
500
3.1
–50
0
50
100
TEMPERATURE (°C)
150
3592 G10
(T
A
= 25°C, unless otherwise noted)
Switching Frequency
vs Temperature
1400
R
T
= 48.7k
SWITCH CURRENT LIMIT (mA)
1200
1000
800
600
400
200
Current Limit During Soft Start
3.2
R
T
= 140k
R
T
= 357k
300
–50 –30 –10 10 30 50 70 90 110 130
TEMPERATURE (°C)
3592 G11
0
0.5
1
1.5
V
SHDN
(V)
2
2.5
3592 G12
Frequency Foldback
2500
R
T
= 48.7k
SWITCH CURRENT LIMIT (A)
1.4
1.3
1.2
1.1
1
0.9
0.8
0.7
0.6
0
600 800 1000 1200 1400 1600 1800 2000 2200
SHDN
VOLTAGE (mV)
3592 G13
Switch Current Limit
1.50
1.45
SWITCH CURRENT LIMIT (A)
1.40
1.35
1.30
1.25
1.20
1.15
1.10
1.05
0
20
40
60
DUTY CYCLE (%)
80
100
3592 G14
Switch Current Limit
2000
FREQUENCY (kHz)
1500
TYPICAL
1000
500
0.5
1.00
–50 –30 –10 10 30 50 70 90 110 130
TEMPERATURE (°C)
3592 G15
Operating Waveforms
Operating Waveforms,
Discontinuous Mode
V
SW
5V/DIV
V
CAP
10mV/DIV
AC COUPLED
I
L
500mA/DIV
500ns/DIV
3592 G16
V
SW
5V/DIV
V
CAP
10mV/DIV
AC COUPLED
I
L
500mA/DIV
500ns/DIV
3592 G17
3592fa
5
LINER [ LINEAR TECHNOLOGY ]
