LT1373
TYPICAL PERFOR A CE CHARACTERISTICS
U W
Shutdown Delay and Threshold
vs Temperature
Minimum Synchronization
Voltage vs Temperature
Error Amplifier Output Current
vs Feedback Pin Voltage
20
18
16
14
12
10
8
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
100
75
3.0
2.5
2.0
1.5
1.0
0.5
0
f
= 330kHz
SYNC
25°C
–55°C
SHUTDOWN
THRESHOLD
50
125°C
25
SHUTDOWN
DELAY
0
6
–25
–50
–75
4
2
0
–50
50
100 125
150
–50 –25
0
25 50 75 100 125 150
TEMPERATURE (°C)
–0.3
–0.2
–0.1
V
0.1
–25
0
25
75
REF
TEMPERATURE (°C)
FEEDBACK PIN VOLTAGE (V)
LT1373 • G04
LT1373 • G05
LT1373 • G06
S/S Pin Input Current
vs Voltage
Switching Frequency
Error Amplifier Transconductance
vs Temperature
vs Feedback Pin Voltage
500
400
300
200
100
0
5
4
110
100
90
80
70
60
50
40
30
20
10
V
= 5V
∆I (V )
∆V (FB)
IN
C
g
=
m
3
2
1
0
–1
–2
–3
–4
–5
–50
50
100 125
150
–25
0
25
75
–1
0
1
2
3
4
5
6
7
8
9
0
0.1 0.2 0.3
0.6 0.7 0.8 0.9 1.0
0.4 0.5
TEMPERATURE (°C)
S/S PIN VOLTAGE (V)
FEEDBACK PIN VOLTAGE (V)
LT1373 • G09
LT1373 • G07
LT1373 • G08
VC Pin Threshold and High
Clamp Voltage vs Temperature
Feedback Input Current
vs Temperature
Negative Feedback Input
Current vs Temperature
2.4
2.2
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0
–2
400
350
300
250
200
150
100
50
V
NFB
= V
NFR
V
FB
= V
REF
V
C
HIGH CLAMP
–4
–6
–8
–10
–12
–14
–16
–18
–20
V
C
THRESHOLD
0
–50
50
100 125
–50
50
100 125
150
–25
0
25
75
150
–25
0
25
75
50 75
25
TEMPERATURE (°C)
–50 –25
0
100 125 150
TEMPERATURE (°C)
TEMPERATURE (°C)
LT1373 • G10
LT1373 • G12
LT1373 • G11
4
Linear [ Linear ]
