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LTC3851-1 Datasheet(PDF) 6 Page - Linear Technology

Part # LTC3851-1
Description  Synchronous Step-Down Switching Regulator Controller
Download  28 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3851-1 Datasheet(HTML) 6 Page - Linear Technology

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LTC3851-1
6
38511f
TYPICAL PERFORMANCE CHARACTERISTICS
Maximum Current Sense
Threshold vs Common Mode
Voltage
Maximum Peak Current Sense
Threshold vs ITH Voltage
Burst Mode Peak Current Sense
Threshold vs ITH Voltage
Maximum Current Sense
Threshold vs Duty Cycle
Regulated Feedback Voltage vs
Temperature
INTVCC Line Regulation
Shutdown (RUN) Threshold vs
Temperature
Maximum Current Sense
Threshold vs Feedback Voltage
(Current Foldback)
TK/SS Pull-Up Current vs
Temperature
INPUT VOLTAGE (V)
48
12
3.5
3.7
4.1
4.3
4.5
28
32
36
5.3
38511 G13
3.9
16
20
24
40
4.7
4.9
5.1
ILOAD = 0mA
ILOAD = 25mA
VSENSE COMMON MODE VOLTAGE (V)
0
0
3
3.5
4
4.5
90
80
70
60
50
40
30
20
10
38511 G14
0.5
1
1.5
2
2.5
5
VITH (V)
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2
38511 G15
2.4
90
80
70
60
50
40
30
20
10
0
–10
–20
DUTY CYCLE RANGE: 0% TO 100%
VITH (V)
60
50
40
30
20
10
0
0.8
1.2
1.6
2.0
38511 G16
2.4
0.6
0.4
1.0
1.4
1.8
2.2
BURST COMPARATOR FALLING THESHOLD:
VITH = 0.4V
MAXIMUIM
MINIMUIM
FEEDBACK VOLTAGE (V)
0
0.8
38511 G18
0
0.2
0.4
0.6
0.1
0.3
0.5
0.7
90
80
70
60
50
40
30
20
10
TEMPERATURE (°C)
–50
0.5
0.6
0.8
0.9
1.0
1.5
1.2
0
50
75
38511 G19
0.7
1.3
1.4
1.1
–25
25
100
125
TEMPERATURE (°C)
–50
–25
0.9
1.1
1.4
0
50
75
38511 G20
1.0
1.3
1.2
25
100
125
RUN RISING THRESHOLD (ON)
RUN FALLING THRESHOLD (OFF)
TEMPERATURE (°C)
–50
802
804
806
25
75
38511 G21
800
798
–25
0
50
100
125
796
794
DUTY CYCLE (%)
0
0
10
30
40
50
40
80
100
90
38511 G17
20
20
60
60
70
80


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