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LT3990 Datasheet(PDF) 5 Page - Linear Technology

Part # LT3990
Description  60V, 350mA Step-Down Regulator with 2.5關A Quiescent Current and Integrated Diodes
PDF  20 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT3990 Datasheet(HTML) 5 Page - Linear Technology

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LT3990
5
3990p
TYPICAL PERFORMANCE CHARACTERISTICS
Minimum
Switch On-Time/Switch Off-Time
Switch VCESAT (ISW = 200mA)
vs Temperature
Switch VCESAT
BOOST Pin Current
Minimum Input Voltage,
VOUT = 3.3V
Minimum Input Voltage,
VOUT = 5V
Switch Current Limit
Switch Current Limit
Switching Frequency
TA = 25°C, unless otherwise noted.
DUTY CYCLE (%)
0
200
300
400
500
600
700
800
20
40
60
80
3990 G10
100
SWITCH PEAK
CURRENT LIMIT
CATCH DIODE VALLEY CURRENT LIMIT
TEMPERATURE ( C)
–50
200
300
400
500
600
050
100
150
3990 G11
700
800
–25
25
75
125
SWITCH PEAK CURRENT LIMIT
CATCH DIODE VALLEY CURRENT LIMIT
TEMPERATURE (°C)
–50
0
0.4
0.8
1.2
1.6
2.4
–25
025
50
75
3990 G12
100 125 150
2.0
0.2
0.6
1.0
1.4
2.2
1.8
TEMPERATURE (°C)
–50
0
20
60
80
100
200
140
0
50
75
3990 G13
40
160
180
120
–25
25
100 125
150
MINIMUM OFF-TIME
LOAD CURRENT = 175mA
MINIMUM ON-TIME
TEMPERATURE (°C)
–50
200
250
300
350
–25
0
25
50
3990 G14
75
100 125 150
SWITCH CURRENT (mA)
0
300
400
500
400
3990 G15
200
100
0
100
200
300
500
SWITCH CURRENT (mA)
0
10
12
14
400
3990 G16
8
6
100
200
300
500
4
2
0
LOAD CURRENT (mA)
050
2.5
3.5
5.0
100
200
250
3990 G17
3.0
4.5
4.0
150
300
350
FRONT PAGE APPLICATION
VOUT = 3.3V
TO START
TO RUN
LOAD CURRENT (mA)
050
4.0
5.0
6.5
100
200
250
3990 G17
4.5
6.0
5.5
150
300
350
FRONT PAGE APPLICATION
VOUT = 5V
TO START
TO RUN



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