Datasheet

LTC3775
6
3775fa
TYPICAL PERFORMANCE CHARACTERISTICS
Pulse-Skipping Mode Waveform
with 0.1A Load
Switching Frequency vs
Temperature
Duty Cycle vs V
COMP
I
LIMT
vs Temperature I
LIMT
vs Input Voltage
I
LIMB
vs Temperature
I
RUN
vs Temperature
Shutdown Current vs
Input Voltage
TEMPERATURE (°C)
–50
450
SWITCHING FREQUENCY (kHz)
460
480
490
500
550
520
0
50
75
3775 G11
470
530
540
510
–25
25
100
125
V
COMP
(V)
0.6
0
DUTY CYCLE (%)
10
30
40
50
100
70
1.0
1.4
1.6
3775 G12
20
80
90
60
0.8
1.2
1.8
2.0
V
IN
= 5V V
IN
= 12V V
IN
= 24V
V
IN
= 40V
TEMPERATURE (°C)
–50
90
I
LIMT
(µA)
92
96
98
100
110
104
0
50
75
3775 G13
94
106
108
102
–25
25
100
125
INPUT VOLTAGE (V)
4
90
I
LIMT
(µA)
92
96
98
100
110
104
12
20
24
3775 G14
94
106
108
102
816
28
32
4036
TEMPERATURE (°C)
–50
9.0
I
LIMB
(µA)
9.2
9.6
9.8
10.0
11.0
10.4
0
50
75
3775 G15
9.4
10.6
10.8
10.2
–25
25
100
125
TEMPERATURE (°C)
–50
–2.0
I
RUN
(µA)
–1.8
–1.4
–1.2
–1.0
0
–0.6
0
50
75
3775 G16
–1.6
–0.4
–0.2
–0.8
–25
25
100
125
INPUT VOLTAGE (V)
4
0
INPUT CURRENT (µA)
5
10
15
12 16 20 24 28 32 36
35
3775 G17
840
20
25
30
V
OUT(AC)
100mV/DIV
I
L
2A/DIV
V
SW
10V/DIV
5µs/DIV
3775 G10
V
IN
= 12V
V
OUT
= 1.2V
LOAD = 0.1A
MODE/SYNC = INTV
CC
SW FREQ = 500kHz
FIRST PAGE CIRCUIT
Output Short-Circuit Waveform
I
L
20A/DIV
V
SS
1V/DIV
20µs/DIV
3775 G25
V
IN
= 12V
V
OUT
= 1.2V
C
SS
= 0.01µF
FIRST PAGE CIRCUIT
0A LOAD