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LT1939IDD-TRPBF Datasheet(PDF) 5 Page - Linear Technology

Part # LT1939IDD-TRPBF
Description  Monolithic 2A Step-Down Regulator Plus Linear Regulator/Controller
Download  24 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT1939IDD-TRPBF Datasheet(HTML) 5 Page - Linear Technology

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LT1939
5
1939f
TYPICAL PERFORMANCE CHARACTERISTICS
Power Good Thresholds vs
Temperature
Power Good Sink Currents vs
Temperature
Frequency vs Temperature
Peak Switch Current vs
Temperature
LDRV Short-Circuit Current vs
Temperature
External Sync Duty Cycle Range
vs External Sync Frequency
Minimum Switching Times
Frequency vs RRT/SYNC
Switch Saturation Voltage vs
Switch Current
TEMPERATURE (°C)
–50
0.65
0.66
0.68
0.69
0.70
0.75
0.72
0
50
75
1939 G10
0.67
0.73
0.74
0.71
–25
25
100
150
125
RISING EDGE
FALLING EDGE
TEMPERATURE (°C)
–50
0
100
300
400
500
1000
700
0
50
75
1939 G11
200
800
900
600
PG
PG
–25
25
100
150
125
TEMPERATURE (°C)
–50
400
420
460
480
500
600
540
0
50
75
1939 G12
440
560
580
520
–25
25
100
150
125
RRT/SYNC = 90.9k
TEMPERATURE (°C)
–50
2.5
2.6
2.8
2.9
3.0
3.5
3.2
0
50
75
1939 G13
2.7
3.3
3.4
3.1
–25
25
100
150
125
TEMPERATURE (°C)
–50
10
11
13
14
15
20
17
0
50
75
1939 G14
12
18
19
16
–25
25
100
150
125
SYNCHRONIZATION FREQUENCY (kHz)
250
0
10
30
40
50
100
70
750
1250
19939 G15
20
80
90
60
1750
2250
MINIMUM DUTY CYCLE
MAXIMUM DUTY CYCLE
TEMPERATURE (°C)
–50
50
75
125
150
175
300
225
0
50
75
1939 G16
100
250
275
200
–25
25
100 125
150
MINIMUM ON TIME
MINIMUM OFF TIME
RRT/SYNC (kΩ)
0
1500
2000
2500
160
1939 G17
1000
500
1250
1750
2250
750
250
0
40
20
80
60
120 140
180
100
200
SWITCH CURRENT (A)
0
200
400
600
100
300
500
0.4
0.8
1.2
1.6
1939 G18
2.0
0.2
0
0.6
1.0
1.4
1.8
–50°C
150°C
25°C


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