LTC3789 View Datasheet(PDF) - Linear Technology
Part Name
Description
Manufacturer
LTC3789 Datasheet PDF : 28 Pages
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LTC3789
Typical Performance Characteristics TA = 25°C unless otherwise noted.
Maximum Current Sense
Threshold vs Duty Factor (Boost)
150
140
130
120
110
100
90
80
70
60
50
0
20
40
60
80
DUTY FACTOR (%)
100
3789 G19
Maximum Current Sense
Threshold vs Duty Factor (Buck)
150
140
130
120
110
100
90
80
70
60
50
0
20
40
60
80
DUTY FACTOR (%)
100
3789 G20
Maximum Current Limit
vs Temperature
150
BOOST
140
130
120
110
100
BUCK
90
80
70
60
–50 –30 –10 10 30 50 70 90 110 130
TEMPERATURE (°C)
3789 G21
Peak Current Threshold
vs VITH (Boost)
200
150
100
50
0
–50
–100
–150
–200
0 0.5 1 1.5 2
VITH (V)
2.5 3
3789 G22
Valley Current Threshold
vs VITH (Buck)
200
150
100
50
0
–50
–100
0
0.5
1
1.5
VITH (V)
2
2.5
3789 G23
Current Foldback Limit
160
140
120
100
80
60
40
20
0
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
VFB (V)
3789 G24
Load Step
Load Step
Load Step
VOUT
200mV/DIV
VOUT
200mV/DIV
VOUT
200mV/DIV
IL
2A/DIV
400µs/DIV
VIN = 6V
VOUT = 12V
LOAD STEP = 200mA TO 2A
3789 G25
IL
2A/DIV
400µs/DIV
VIN = 12V
VOUT = 12V
LOAD STEP = 300mA TO 3A
3789 G26
IL
2A/DIV
400µs/DIV
VIN = 18V
VOUT = 12V
LOAD STEP = 300mA TO 3A
3789 G27
3789f
7
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