Datasheet

6
LTC1698
1698f
TYPICAL PERFOR A CE CHARACTERISTICS
UW
I
VDD
vs SYNC Frequency
f
SYNC
(kHz)
50
I
VDD
(mA)
30
40
50
450
1698 G19
20
10
25
35
45
15
5
0
150100
250200
350 400
300
500
V
DD
= 8V
T
A
= 25°C
C
FG
= C
CG
= 4700pF
C
FG
= C
CG
= 3300pF
C
FG
= C
CG
= 2200pF
C
FG
= C
CG
= 1000pF
TEMPERATURE (°C)
–50
SYNC POSITIVE THRESHOLD (V)
2.00
2.25
25 75 150
1698 G20
1.75
1.50
1.25
1.00
–25 0
50
100 125
V
DD
= 8V
V
DD
(V)
5
1.00
SYNC POSITIVE THRESHOLD (V)
1.24
1.72
1.96
2.20
7
9
10 14
1698 G21
1.48
68
11
12
13
T
A
= 25°C
SYNC Positive Threshold
vs Temperature
SYNC Positive Threshold
vs V
DD
Undervoltage Lockout Threshold
vs Temperature
TEMPERATURE (°C)
–50
V
UVLO
(V)
3
4
5
25 75 150
1698 G24
2
1
0
–25 0
50
100 125
I
VDD
vs V
DD
Opto Driver Short-Circuit Current
vs V
DD
V
DD
(V)
5
OPTO DRIVER SHORT-CIRCUIT CURRENT (mA)
–20
–10
0
810 14
1698 G17
–30
–40
–50
67
9
11 12 13
T
A
= 25°C
V
OPTODRV
= 1.233V
V
DD
(V)
5
I
VDD
(mA)
12
16
20
13
1698 G18
8
4
10
14
18
6
2
0
76
98
11 12
10
14
T
A
= 25°C
f
SYNC
= 100kHz
C
FG
= C
CG
= 4700pF
C
FG
= C
CG
= 3300pF
C
FG
= C
CG
= 2200pF
C
FG
= C
CG
= 1000pF
DRIVER LOAD (pF)
0
TIME (ns)
4000
8000
10000
90
80
70
60
50
40
30
20
10
0
1698 G25
2000 6000
V
DD
= 8V
T
A
= 25°C
CG, FG t
PHL
t
f
t
r
CG, FG t
PLH
TEMPERATURE (°C)
–50 –25 0 25 50 75 100 125 150
t
d
(ns)
90
80
70
60
50
40
30
20
10
0
1698 G26
V
DD
= 8V
C
CG
= C
FG
= 1000pF
f
SYNC
= 100kHz
CG, FG t
PLH
CG, FG t
PHL
f
SYNC
(kHz)
50
DRIVER DISABLE TIME-OUT t
DISS
(µs)
150
250
300 500
1698 G27
100 200
350
400
450
30
25
20
15
10
5
0
NORMALIZED DRIVER DISABLE TIME-OUT
t
DISS
× f
SYNC
2.2
2.0
1.8
1.6
1.4
1.2
1.0
V
DD
= 8V
T
A
= 25°C
t
DISS
× f
SYNC
t
DISS
Driver Rise, Fall and Propagation
Delay vs Driver Load
SYNC Input to Driver Output Delay
vs Temperature
Driver Disable Time-Out vs SYNC
Frequency