LT3694/LT3694-1
VIN = 12V, TA = 25°C, unless otherwise noted.
BST Pin Current
TYPICAL PERFORMANCE CHARACTERISTICS
Efficiency at VOUT = 5V
Switch VCESAT vs Switch Current
vs Switch Current
100
90
80
70
60
50
70
60
50
40
30
20
10
0
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
f
= 800kHz
SW
V
= 6.3V
IN
V
= 12V
IN
V
= 36V
IN
2
3
0
1
2
3
0
1
0
1
2
3
I
(A)
OUT
36941 G01
SWITCH CURRENT (A)
SWITCH CURRENT (A)
36941 G02
36941 G03
Switch Current Limit
vs Duty Cycle
Switch Minimum On-Time and
Off-Time vs Temperature
Switch Current Limit
vs Temperature
5.0
4.5
4.0
3.5
3.0
5.0
4.5
4.0
3.5
3.0
160
140
120
100
80
I
= 1A
SW
25°C
–45°C
MINIMUM
ON-TIME
150°C
MINIMUM
OFF-TIME
60
40
20
0
–50
0
100
150
0
20
40
60
80
100
50
–50
0
100
TEMPERATURE (°C)
150
50
TEMPERATURE (°C)
SWITCH DUTY CYCLE (%)
36941 G04
36941 G06
36941 G05
Frequency Shift vs Temperature
VFB vs Temperature
Frequency vs RT
3.0
2.5
2.0
1.5
1.0
0.5
0
760
758
756
754
752
750
748
746
744
742
740
5
4
R
T
= 200k
R
=
T
3
40.2k
2
1
R
T
= 10.7k
0
–1
–2
–3
–4
–5
0
50
100
(k)
150
200
–50
0
100
150
50
–50
0
100
150
50
R
TEMPERATURE (°C)
TEMPERATURE (°C)
T
36941 G07
36941 G08
36941 G09
36941fb
5
Linear [ Linear ]
