Datasheet

LT3592
5
3592fc
Undervoltage Lockout
vs Temperature
Switching Frequency
vs Temperature
TYPICAL PERFORMANCE CHARACTERISTICS
Current Limit During Soft Start
Frequency Foldback
Switch Current Limit
Switch Current Limit
Operating Waveforms
Operating Waveforms,
Discontinuous Mode
(T
A
= 25°C, unless otherwise noted)
TEMPERATURE (°C)
–50
UNDERVOLTAGE LOCKOUT (V)
3.4
3.3
3.2
3.1
100
3592 G10
150050
TEMPERATURE (°C)
–50
f
SW
(kHz)
2300
1700
1900
2100
1500
1300
1100
900
700
500
300
110
3592 G11
130–30 –10 9070503010
R
T
= 357k
R
T
= 140k
R
T
= 48.7k
V
SHDN
(V)
0.5
SWITCH CURRENT LIMIT (mA)
1400
1200
1000
800
600
400
200
0
2
3592 G12
2.51.51
SHDN VOLTAGE (mV)
600
FREQUENCY (kHz)
2500
2000
1500
1000
500
0
2000
3592 G13
22001000 1200 1400 1600 1800800
R
T
= 48.7k
DUTY CYCLE (%)
0
SWITCH CURRENT LIMIT (A)
1.4
1.3
1.2
1.1
0.8
0.9
1
0.7
0.6
0.5
80
3592 G14
10040 6020
TEMPERATURE (°C)
–50
SWITCH CURRENT LIMIT (A)
1.50
1.40
1.45
1.35
1.30
1.15
1.20
1.25
1.10
1.05
1.00
90 110
3592 G15
1303010 7050–30 –10
TYPICAL
V
SW
5V/DIV
V
CAP
10mV/DIV
AC-COUPLED
I
L
500mA/DIV
3592 G16
500ns/DIV
V
SW
5V/DIV
V
CAP
10mV/DIV
AC-COUPLED
I
L
500mA/DIV
3592 G17
500ns/DIV