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LTC1778-1 Datasheet(PDF) 5 Page - Linear Technology

Part # LTC1778-1
Description  Wide Operating Range, No RSENSE Step-Down Controller
Download  24 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC1778-1 Datasheet(HTML) 5 Page - Linear Technology

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LTC1778/LTC1778-1
1778fb
TYPICAL PERFOR A CE CHARACTERISTICS
Maximum Current Sense
Threshold vs Temperature
Maximum Current Sense
Threshold vs VRNG Voltage
Feedback Reference Voltage
vs Temperature
VRNG VOLTAGE (V)
0.5
0
50
100
150
200
300
0.75
1.0
1.25
1.5
1778 G10
1.75
2.0
250
TEMPERATURE (°C)
–50
–25
100
120
150
0
50
75
1778 G11
110
140
130
25
100
125
VRNG = 1V
TEMPERATURE (°C)
–50
0.78
0.79
0.80
0.81
0.82
–25
0
25
50
1778 G12
75
100
125
Current Limit Foldback
VFB (V)
0
0
25
50
75
100
125
150
VRNG = 1V
0.2
0.4
0.6
0.8
1778 G09
On-Time vs ION Current
ION CURRENT (µA)
1
10
100
1k
10k
10
100
1778 G20
VVON = 0V
VON VOLTAGE (V)
0
400
600
1778 G21
200
0
1
2
3
1000
IION = 30µA
800
TEMPERATURE (°C)
–50
200
250
300
25
75
1778 G22
150
100
–25
0
50
100
125
50
0
IION = 30µA
VVON = 0V
On-Time vs VON Voltage
On-Time vs Temperature
RUN/SS VOLTAGE (V)
1.5
0
25
50
75
100
125
150
VRNG = 1V
2
2.5
3
3.5
1778 G23
Maximum Current Sense
Threshold vs RUN/SS Voltage
Current Sense Threshold
vs ITH Voltage
ITH VOLTAGE (V)
0
–200
–100
0
100
200
300
0.5
1.0
1.5
2.0
1778 G08
2.5
3.0
VRNG =
1V
0.7V
0.5V
1.4V
2V


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