Datasheet

LT3694/LT3694-1
5
36941fb
TEMPERATURE (°C)
–50
–5
NORMALIZED FREQUENCY SHIFT (%)
–3
–1
1
0
50
100
3
5
–4
–2
0
2
4
150
36941 G09
R
T
= 200k
R
T
=
40.2k
R
T
= 10.7k
SWITCH CURRENT (A)
0
0
BOOST PIN CURRENT (mA)
20
40
60
1 2
10
30
50
70
3
36941 G03
TEMPERATURE (°C)
–50
3.0
SWITCH I
LIM
(A)
3.5
4.5
0
50
100
5.0
4.0
150
36941 G04
TEMPERATURE (°C)
–50
0
TIME (ns)
40
80
120
0
50
100
160
20
60
100
140
150
36941 G06
I
SW
= 1A
MINIMUM
ON-TIME
MINIMUM
OFF-TIME
TEMPERATURE (°C)
–50
740
V
FB
(mV)
748
756
0
50
100
760
744
752
746
754
758
742
750
150
36941 G07
R
T
(k)
0 50 100
2.0
FREQUENCY (MHz)
2.5
150 200
1.5
1.0
0.5
0
3.0
36941 G08
SWITCH CURRENT (A)
0
SWITCH V
CESAT
(V)
0.4
0.5
0.3
0.2
2
1
3
0.1
0
0.6
36941 G02
0.8
0.7
TYPICAL PERFORMANCE CHARACTERISTICS
Switch Current Limit
vs Temperature
Switch Minimum On-Time and
Off-Time vs Temperature
V
FB
vs Temperature Frequency vs R
T
Frequency Shift vs Temperature
BST Pin Current
vs Switch Current
Efficiency at V
OUT
= 5V
Switch V
CESAT
vs Switch Current
Switch Current Limit
vs Duty Cycle
V
IN
= 12V, T
A
= 25°C, unless otherwise noted.
0 60
100
4020
80
SWITCH DUTY CYCLE (%)
SWITCH I
LIM
(A)
4.5
4.0
3.5
3.0
5.0
36941 G05
–45°C
150°C
25°C
I
OUT
(A)
0
EFFICIENCY (%)
90
80
70
2
1
3
60
50
100
36941 G01
V
IN
= 6.3V
V
IN
= 12V
V
IN
= 36V
f
SW
= 800kHz