Datasheet

-50 -20 10 40 70 100 130
TEMPERATURE (ºC)
V
OUT
= 3.3V
R
ON
= 50 k:
L = 4.7 PH
I
LOAD
= 0.4A
V
IN
= 36V
V
IN
= 18V
V
IN
= 4.5V
0.75
0.775
0.8
0.825
0.85
V
FB
(V)
0 10 20 30 40
0
200
400
600
800
1000
SWITCHING FREQUENCY, F
SW
(kHz)
V
IN
(V)
I
LOAD
= 0.5A
I
LOAD
= 0.5A
I
LOAD
= 0.5A
I
LOAD
= 1.5A
I
LOAD
= 1.5A
I
LOAD
= 1.5A
V
OUT
= 3.3A
R
ON
= 25 k:
L = 3.8 PH
R
ON
= 50 k:
L = 8.2 PH
R
ON
= 100 k:
L = 14 PH
0
5 10 15 20 25 30 35 40
V
IN
(V)
T
ON
(ns)
0
1000
2000
3000
4000
R
ON
= 10 k:
R
ON
= 25 k:
R
ON
= 50 k:
R
ON
= 100 k:
4.5 6 7.5 9 10.5
V
IN
(V)
4
4.5
5
5.5
6
6.5
7
V
CC
(V)
V
CC
not loaded externally
I
LOAD
= 700 mA
R
ON
= 100 k:
R
ON
= 50 k:
R
ON
= 20 k:
0 20 40 60 80
V
CC
(V)
I
CC
(mA)
0
1
2
3
4
5
6
7
V
IN
= 7V
V
IN
= 36V
V
IN
= 18V
V
CC
Externally Loaded
C
VCC
= 680 nF
V
FB
= 1V, no switching
0 10 20 30 40
0
200
400
600
800
1000
I
IN
(PA)
V
IN
(V)
V
EN
= 2V ; V
FB
= 1V
Active mode, no switching
V
EN
= 0V
Shut-down mode
-40
o
C
25
o
C
125
o
C
125
o
C
25
o
C
-40
o
C
LM3100
www.ti.com SNVS421G –JANUARY 2006–REVISED APRIL 2013
Typical Performance Characteristics
All curves taken at V
IN
= 18V with configuration in typical application circuit for V
OUT
= 3.3V shown in this datasheet. T
A
=
25°C, unless otherwise specified.
Quiescent Current, I
IN
vs V
IN
V
CC
vs I
CC
Figure 2. Figure 3.
V
CC
vs V
IN
T
ON
vs V
IN
Figure 4. Figure 5.
Switching Frequency, F
SW
vs V
IN
V
FB
vs Temperature
Figure 6. Figure 7.
Copyright © 2006–2013, Texas Instruments Incorporated Submit Documentation Feedback 5
Product Folder Links: LM3100