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LTC3852 Datasheet(PDF) 6 Page - Linear Technology

Part # LTC3852
Description  Low Input Voltage, Synchronous Step-Down DC/DC Controller
PDF  32 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3852 Datasheet(HTML) 6 Page - Linear Technology

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LTC3852
6
3852f
TYPICAL PERFORMANCE CHARACTERISTICS
Controller Maximum Current
Sense Threshold
vs Common Mode Voltage
Controller Maximum Peak Current
Sense Threshold vs ITH Voltage
Controller Burst Mode Peak
Current Sense Threshold
vs ITH Voltage
Controller Maximum Current
Sense Threshold vs Duty Cycle
Controller Maximum Current
Sense Threshold vs Feedback
Voltage (Current Foldback)
Controller Input DC Supply
Current vs Input Voltage (VIN2)
Controller TRACK/SS Pull-Up
Current vs Temperature
INPUT VOLTAGE (V)
4
12
20
24
40
3852 G12
816
28
32
36
3.0
2.5
2.0
1.5
1.0
0.5
0
VSENSE COMMON MODE VOLTAGE (V)
0
0
3
3.5
4
4.5
90
80
70
60
50
40
30
20
10
3852 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
3852 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
3852 G16
2.4
0.6
0.4
1.0
1.4
1.8
2.2
BURST COMPARATOR FALLING THRESHOLD:
VITH = 0.4V
MAXIMUM
MINIMUM
DUTY CYCLE (%)
0
0
10
30
40
50
40
80
100
90
3852 G17
20
20
60
60
70
80
FEEDBACK VOLTAGE (V)
0
0.8
3852 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
3852 G19
0.7
1.3
1.4
1.1
–25
25
100
125
Controller Shutdown (RUN)
Threshold vs Temperature
Controller Regulated Feedback
Voltage vs Temperature
TEMPERATURE (°C)
–50
–25
0.9
1.1
1.4
0
50
75
3852 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
3852 G21
800
798
–25
0
50
100
125
796
794



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