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LT3668 Datasheet(PDF) 5 Page - Linear Technology

Part # LT3668
Description  40V 400mA Step-Down Switching Regulator with Dual Fault Protected Tracking LDOs
PDF  28 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT3668 Datasheet(HTML) 5 Page - Linear Technology

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LT3668
5
3668fa
For more information www.linear.com/LT3668
TYPICAL PERFORMANCE CHARACTERISTICS
No-Load Supply Current
No-Load Supply Current
Maximum Load Current
Maximum Load Current
Switching Regulator
Load Regulation
Efficiency, VOUT1 = 3.3V
Efficiency, VOUT1 = 6V
VFB1 vs Temperature
Switch Current Limit
TA = 25°C, unless otherwise noted.
TEMPERATURE (°C)
–50
1.10
1.15
1.20
1.25
1.30
–25
0
25
50
3668 G03
75 100 125 150
LOAD CURRENT (mA)
80
70
60
50
40
30
20
10
90
0.01
1
10
3668 G01
0
0.1
100
VIN1 = 12V
VIN1 = 36V
VIN1 = 24V
FRONT PAGE APPLICATION
BUCK REGULATOR ONLY
VOUT1 = 3.3V
L: MSS7341-223MLB
LOAD CURRENT (mA)
80
90
70
60
50
40
30
20
10
100
0.01
1
10
3668 G02
0
0.1
100
VIN1 = 12V
VIN1 = 24V
VIN1 = 36V
FRONT PAGE APPLICATION
BUCK REGULATOR ONLY
VOUT1 = 6V
L: MSS7341-273MLB
INPUT VOLTAGE (V)
5
0
10
30
40
50
100
70
15
25
30
35
3668 G04
20
80
90
60
10
20
40
FRONT PAGE APPLICATION
TEMPERATURE (°C)
–50 –25
0
100µ
1m
INCREASED SUPPLY CURRENT
DUE TO CATCH DIODE LEAKAGE
AT HIGH TEMPERATURE
FRONT PAGE APPLICATION
CATCH DIODE: CMMSH1-60
25
50
75 100 125 150
3668 G05
10µ
INPUT VOLTAGE (V)
5
600
650
700
20
30
3668 G06
550
500
10
15
25
35
40
450
400
FRONT PAGE APPLICATION
VOUT1 = 3.3V
TYPICAL
MINIMUM
INPUT VOLTAGE (V)
5
600
650
700
20
30
3668 G07
550
500
10
15
25
35
40
450
400
FRONT PAGE APPLICATION
TYPICAL
MINIMUM
LOAD CURRENT (mA)
0
–0.10
–0.08
–0.04
–0.02
0
0.10
0.04
100
200 250
3668 G08
–0.06
0.06
0.08
0.02
50
150
300 350 400
FRONT PAGE APPLICATION
REFERENCED FROM VOUT1 AT 200mA LOAD
DUTY CYCLE (%)
0
600
700
80
3668 G09
500
400
20
40
60
100
800
SWITCH PEAK
CURRENT LIMIT
CATCH DIODE VALLEY CURRENT LIMIT



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