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LT1377 Datasheet(PDF) 4 Page - Linear Technology

Part # LT1377
Description  500kHz and 1MHz High Efficiency 1.5A Switching Regulators
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT1377 Datasheet(HTML) 4 Page - Linear Technology

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4
LT1372/LT1377
TYPICAL PERFORMANCE CHARACTERISTICS
Error Amplifier Output Current
vs Feedback Pin Voltage
Shutdown Delay and Threshold
vs Temperature
TEMPERATURE (
°C)
–50
0
2
6
8
10
20
14
0
50
75
LT1372 • 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
S/S Pin Input Current
vs Voltage
Error Amplifier Transconductance
vs Temperature
Switching Frequency
vs Feedback Pin Voltage
VC Pin Threshold and High
Clamp Voltage vs Temperature
FEEDBACK PIN VOLTAGE (V)
400
–300
–200
–100
300
100
–0.1
0.1
200
0
–0.3
–0.2
VREF
–55
°C
125
°C
25
°C
LT1372 • G06
Minimum Synchronization
Voltage vs Temperature
TEMPERATURE (
°C)
–50
0
0.5
1.0
1.5
2.0
050
100
150
LT1372 • G05
2.5
3.0
–25
25
75
125
fSYNC = 700kHz (LT1372)
fSYNC = 1.4MHz (LT1377)
LT1377
LT1372
S/S PIN VOLTAGE (V)
–1
1
3
5
7
LT1372 • G07
–1
–3
0
2
4
–2
–4
–5
1
3
5
08
2
4
6
9
VIN = 5V
FEEDBACK PIN VOLTAGE (V)
0
70
90
110
0.8
LT1372 • 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
200
600
800
1000
2000
1400
0
50
75
LT1372 • G09
400
1600
1800
1200
–25
25
100 125
150
gm =
∆I (VC)
∆V (FB)
TEMPERATURE (
°C)
–50
0.4
0.6
1.0
1.2
1.4
2.4
1.8
0
50
75
LT1372 • G10
0.8
2.0
2.2
1.6
–25
25
100 125
150
VC HIGH CLAMP
VC THRESHOLD
TEMPERATURE (
°C)
–50
400
500
600
150
LT1372 • G11
300
200
0
0
50
100
100
800
700
–25
25
75
125
VFB =VREF
Feedback Input Current
vs Temperature
TEMPERATURE (
°C)
–50
–50
–30
0
0
50
75
LT1372 • G12
–40
–10
–20
–25
25
100 125
150
VNFB =VNFR
Negative Feedback Input Current
vs Temperature


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