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LTC3890 Datasheet(PDF) 7 Page - Linear Technology

Part # LTC3890
Description  Low IQ, Synchronous Step-Down Controller with 24V Output Voltage Capability
PDF  34 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3890 Datasheet(HTML) 7 Page - Linear Technology

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LTC3807
7
3807fa
For more information www.linear.com/LTC3807
TYPICAL PERFORMANCE CHARACTERISTICS
VITH (V)
0
40
60
80
0.6
1.0
3807 G13
20
0
0.2
0.4
0.8
1.2
1.4
–20
–40
Burst Mode
OPERATION
PULSE-SKIPPING MODE
5% DUTY CYCLE
FORCED CONTINUOUS MODE
ILIM = FLOAT
ILIM = INTVCC
ILIM = GND
VSENSE COMMON MODE VOLTAGE (V)
0
20
3807 G14
400
300
10
15
5
25
800
700
600
500
200
100
0
–100
DUTY CYCLE (%)
0
50
40
60
70
80
3807 G15
30
20
20
40 50
100
80
60
10
30
90
70
ILIM = FLOAT
ILIM = INTVCC
ILIM = GND
FEEDBACK VOLTAGE (MV)
0
40
60
800
3807 G16
20
0
200
400 500
80
30
50
10
70
600
100
300
700
ILIM = FLOAT
ILIM = INTVCC
ILIM = GND
TEMPERATURE (°C)
–75
75
50
25
0
3807 G17
60
50
–50 –25
75
45
30
40
35
80
70
65
55
100 125 150
VIN = 12V
Burst Mode OPERATION
Maximum Current Sense Voltage
vs ITH Voltage
SENSE– Pin Input Bias Current
Maximum Current Sense
Threshold vs Duty Cycle
Foldback Current Limit
Quiescent Current vs Temperature
INTVCC vs INTVCC Load Current
TEMPERATURE (°C)
–75
806
0
25 50
3807 G21
800
796
–50 –25
75
794
792
808
804
802
798
100 125 150
TRACK/SS Pull-Up Current
vs Temperature
Shutdown (RUN) Threshold
vs Temperature
Regulated Feedback Voltage
vs Temperature
INTVCC LOAD CURRENT (mA)
0
5.25
40
3807 G18
4.50
20
60
4.00
5.50
5.00
4.75
4.25
80
100
EXTVCC = 5V
EXTVCC = 8.5V
EXTVCC = 0V
VIN = 12V
TEMPERATURE (°C)
–75
11.5
50
25
3807 G19
10.0
–25 0
–50
75
12.0
11.0
10.5
9.5
9.0
8.5
8.0
125
100
150
TEMPERATURE (°C)
–75
50
0
25
3807 G20
1.20
–25
–50
75
1.30
1.25
1.15
1.10
125
100
150
RUN RISING
RUN FALLING



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