Datasheet

LT3479
4
3479fc
TYPICAL PERFORMANCE CHARACTERISTICS
SWITCH CURRENT (A)
0
0
V
CE(SAT)
(V)
0.1
0.2
0.3
125°C
–50°C
0.5
0.4
0.5 1 1.5 2
3479 G01
2.5 3
25°C
TEMPERATURE (°C)
–50
CURRENT (A)
4
5
6
25 75
3479 G02
3
2
–25 0
50 100 125
1
0
INDUCTOR CURRENT LIMIT
SWITCH CURRENT LIMIT
TEMPERATURE (°C)
–50
1.21
V
REF
(V)
1.22
1.23
1.24
1.26
1.25
1.27
–25 0 25 50
3479 G03
75 125100 150
V
IN
= 24V
V
IN
= 2.5V
TEMPERATURE (°C)
–50
1.250
SHDN THRESHOLD (V)
1.375
1.500
1.625
1.750
–25 0 25 50
3479 G04
75 100 125
V
SHDN
(V)
0
0
SHDN PIN CURRENT (μA)
10
20
30
40
50
4
81216
3479 G05
20 24
–50°C
25°C
125°C
TEMPERATURE (°C)
–50
2
V
IN
PIN CURRENT (mA)
3
4
5
6
–25 0 25 50
3479 G06
75 125100 150
V
C
= 0.3V
TEMPERATURE (°C)
–50
0
I
SS
(μA)
5
10
15
20
–25 0 25 50
3479 G07
75 125100 150
TEMPERATURE (°C)
–50
0
FREQUENCY (MHz)
0.4
0.8
1.2
1.6
2.0
–25 0 25 50
3479 G08
75 125100 150
R
T
= 10k
R
T
= 15k
R
T
= 20k
TEMPERATURE (oC)
–50
0
OFFSET VOLTAGE (mV)
1
2
3
4
5
–25
02550
3479 G09
75 100
V
C
= 0.5V
V
C
= 1V
SHDN Pin Turn-On Threshold SHDN Pin Current V
IN
Pin Current
Soft-Start Pin Current Oscillator Frequency Feedback Amplifi er Offset Voltage
Switch V
CE(SAT)
Inductor and Switch Current Limit V
REF