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