Datasheet

LT3478/LT3478-1
5
34781f
JUNCTION TEMPERATURE (°C)
–50
V
IN
CURRENT (mA)
–25 0 25
3478 G12
50 75 100 125
V
IN
= 2.8V
V
C
= 0V
14
12
10
8
6
4
2
0
V
IN
(V)
0
V
IN
CURRENT (mA)
14
12
10
8
6
4
2
0
36 12
3478 G11
18 272491521 303336
T
A
= 25°C
V
C
= 0V
JUNCTION TEMPERATURE (°C)
–50
V
IN
CURRENT (µA)
50
40
30
20
10
0
–25 0 25
3478 G10
50 75 100 125
V
IN
= 36V
V
IN
= 20V
V
IN
= 2.8V
SHDN = 0V
JUNCTION TEMPERATURE (°C)
–50
SHDN PIN CURRENT (µA)
15
10
5
0
–25 0 25
3478 G09
50 75 100 125
JUST BEFORE PART TURNS ON
AFTER PART TURNS ON
JUNCTION TEMPERATURE (°C)
–50
SHDN (V)
1.60
1.50
1.40
1.30
1.20
–25 0 25
3478 G08
50 75 100 125
JUNCTION TEMPERATURE (°C)
–50
V
REF
(V)
1.28
1.26
1.24
1.22
1.20
1.18
–25 0 25
3478 G07
50 75 100 125
V
REF
vs Temperature
⎯
S
⎯
H
⎯
D
⎯
N Threshold vs Temperature
⎯
S
⎯
H
⎯
D
⎯
N Pin (Hysteresis) Current vs
Temperature
V
IN
Shutdown Current vs
Temperature V
IN
Quiescent Current vs V
IN
V
IN
Quiescent Current vs
Temperature
TYPICAL PERFOR A CE CHARACTERISTICS
UW
DUTY CYCLE (%)
0
SWITCH PEAK CURRENT LIMIT (A)
7
6
5
4
3
2
1
0
20
3478 G19
40 60 80 100
T
A
= 25°C
JUNCTION TEMPERATURE (°C)
–50
PIN CURRENT (µA)
4
2
0
–25 0 25
3478 G18
50 75 100 125
I(SW PIN)
I(V
S
PIN) = I(L PIN)
SHDN = 0V
V
S
= L = SW = 36V
V
S
, L, SW Shutdown Currents vs
Temperature
Switch Peak Current Limit
vs Duty Cycle