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LT3991EMSETRPBF Datasheet(PDF) 5 Page - Linear Technology

Part # LT3991EMSETRPBF
Description  55V, 1.2A Step-Down Regulator with 2.8 Quiescent Current
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT3991EMSETRPBF Datasheet(HTML) 5 Page - Linear Technology

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LT3991
5
3991f
TYPICAL PERFORMANCE CHARACTERISTICS
Switch Current Limit
Switch Current Limit
Switch VCESAT
Boost Pin Current
Frequency Foldback
Minimum Switch On-Time/
Switch Off-Time
Load Regulation
Switching Frequency
TA = 25°C, unless otherwise noted.
Soft-Start
LOAD CURRENT (mA)
3991 G10
0.30
–0.25
–0.20
–0.15
–0.10
–0.05
0.20
0.15
0.10
0.05
0
0.25
–0.30
0
1200
600
800
1000
400
200
FRONT PAGE APPLICATION
REFERENCED FROM VOUT AT 0.5A LOAD
TEMPERATURE (°C)
3991 G11
1000
650
900
850
800
750
700
950
600
–55
155
35
65
125
95
5
–25
DUTY CYCLE (%)
3991 G12
3.0
2.0
1.5
1.0
0.5
2.5
0
0
100
60
80
40
20
TEMPERATURE (°C)
3991 G13
2.5
2.4
2.3
2.2
2.1
2.0
1.5
1.6
1.7
1.8
1.9
–55
–25
155
125
95
65
35
5
DUTY CYCLE = 30%
SWITCH CURRENT (mA)
3991 G14
700
400
300
200
100
500
600
0
0
1500
500
750
1000
1250
250
SWITCH CURRENT (mA)
3991 G15
45
20
15
10
5
25
30
35
40
0
0
1500
500
750
1000
1250
250
FB PIN VOLTAGE (V)
0
900
800
400
200
500
600
700
300
100
0
0.8
0.4
3991 G16
1.2
0.6
0.2
1
TEMPERATURE (°C)
–55
400
350
150
50
200
250
300
100
0
65
5
3991 G17
155
35
–25
95
125
tOFF(MIN) 1A LOAD
tOFF(MIN) 0.5A LOAD
tON(MIN)
SS PIN VOLTAGE (V)
0
2.5
2.0
0.5
1.0
1.5
0
1.25
0.75
3991 G18
2
1
0.5
0.25
1.75
1.5


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