Datasheet

4
LT1373
Shutdown Delay and Threshold
vs Temperature
Error Amplifier Output Current
vs Feedback Pin Voltage
TEMPERATURE (°C)
–50
0
SHUTDOWN DELAY (µs)
SHUTDOWN THRESHOLD (V)
2
6
8
10
20
14
0
50
75
LT1373 • G04
4
16
18
12
0
0.2
0.6
0.8
1.0
2.0
1.4
0.4
1.6
1.8
1.2
–25 25
100
125
150
SHUTDOWN
THRESHOLD
SHUTDOWN
DELAY
TEMPERATURE (°C)
–50
0
MINIMUM SYNCHRONIZATION VOLTAGE (V
P-P
)
0.5
1.0
1.5
2.0
050
100
150
LT1373 • G05
2.5
3.0
–25 25
75
125
f
SYNC
= 330kHz
Minimum Synchronization
Voltage vs Temperature
FEEDBACK PIN VOLTAGE (V)
100
ERROR AMPLIFIER OUTPUT CURRENT (µA)
–75
–50
–25
75
25
0.1 0.1
50
0
0.3 0.2
V
REF
–55°C
125°C
25°C
LT1373 • G06
S/S Pin Input Current
vs Voltage
S/S PIN VOLTAGE (V)
–1
S/S PIN INPUT CURRENT (µA)
1
3
5
7
LT1373 • G07
–1
–3
0
2
4
–2
–4
–5
1
3
5
08
2
4
6
9
V
IN
= 5V
Error Amplifier Transconductance
vs Temperature
Switching Frequency
vs Feedback Pin Voltage
FEEDBACK PIN VOLTAGE (V)
0
SWITCHING FREQUENCY (% OF TYPICAL)
70
90
110
0.8
LT1373 • G08
50
30
60
80
100
40
20
10
0.2
0.4
0.6
0.1 0.9
0.3
0.5
0.7
1.0
TEMPERATURE (°C)
–50
0
TRANSCONDUCTANCE (µmho)
200
500
0
50
75
LT1373 • G09
100
400
300
–25 25
100
125
150
g
m
=
I (V
C
)
V (FB)
V
C
Pin Threshold and High
Clamp Voltage vs Temperature
Negative Feedback Input
Current vs Temperature
Feedback Input Current
vs Temperature
TEMPERATURE (°C)
–50
0.4
V
C
PIN VOLTAGE (V)
0.6
1.0
1.2
1.4
2.4
1.8
0
50
75
LT1373 • G10
0.8
2.0
2.2
1.6
–25 25
100
125
150
V
C
HIGH CLAMP
V
C
THRESHOLD
TEMPERATURE (°C)
–50
FEEDBACK INPUT CURRENT (nA)
200
250
300
150
LT1373 • G11
150
100
0
0
50
100
50
400
350
–25
25
75
125
V
FB
= V
REF
TEMPERATURE (°C)
–50
–20
NEGATIVE FEEDBACK INPUT CURRENT (µA)
–12
–14
0
0
50
75
LT1373 • G12
–16
–18
–4
–6
–2
–8
–10
–25 25
100
125
150
V
NFB
= V
NFR
TYPICAL PERFOR A CE CHARACTERISTICS
UW