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LTC4444 Datenblatt(PDF) 8 Page - Linear Technology

Teilenummer LTC4444
Bauteilbeschribung  High Effi ciency, Synchronous, 4-Switch Buck-Boost Controller
PDF  28 Pages
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Hersteller  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4444 Datenblatt(HTML) 8 Page - Linear Technology

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background image
LTC3780
8
3780fe
Oscillator Frequency
vs Temperature
Undervoltage Reset
vs Temperature
Minimum Current Sense
Threshold vs Duty Factor (Buck)
Maximum Current Sense
Threshold vs Duty Factor (Boost)
Maximum Current Sense
Threshold vs Duty Factor (Buck)
Minimum Current Sense
Threshold vs Temperature
Peak Current Threshold
vs VITH (Boost)
Valley Current Threshold
vs VITH (Buck)
Current Foldback Limit
TYPICAL PERFORMANCE CHARACTERISTICS
TEMPERATURE (°C)
–75 –50
0
50
150
200
250
50
450
3780 G19
100
0
–25
75
100
25
125
300
350
400
VPLLFLTR = 2.4V
VPLLFLTR = 1.2V
VPLLFLTR = 0V
TEMPERATURE (°C)
–75 –50 –25
3.0
3.4
4.2
4.0
0
50
75
3780 G20
3.2
3.8
3.6
25
100 125
DUTY FACTOR (%)
–80
–60
–40
–20
80
60
40
20
3780 G21
0
100
DUTY FACTOR (%)
0
140
160
80
3780 G22
120
100
20
40
60
100
180
DUTY FACTOR (%)
110
120
130
140
20
40
60
80
3780 G23
100
0
TEMPERATURE (°C)
–75 –50
50
100
200
25
75
3780 G24
0
–50
–25
0
50
100 125
–100
–150
150
BOOST
BUCK
VITH (V)
0
–100
–50
0
50
100
200
0.4
0.8
1.2
1.6
3780 G25
1.8
2.4
150
VITH (V)
0
–150
–100
–50
0
50
100
0.4
0.8
1.2
1.6
3780 G26
2.0
2.4
VOSENSE (V)
0
0
40
80
120
160
200
BUCK
BOOST
0.2
0.4
0.6
3780 G32
0.8
TA = 25°C, unless otherwise noted.



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