Datasheet

LTC3789
7
3789fa
Maximum Current Sense
Threshold vs Duty Factor (Boost)
Maximum Current Sense
Threshold vs Duty Factor (Buck)
Maximum Current Limit
vs Temperature
Peak Current Threshold
vs V
ITH
(Boost)
Valley Current Threshold
vs V
ITH
(Buck)
Current Foldback Limit
Typical perForMance characTerisTics
T
A
= 25°C unless otherwise noted.
V
FB
(V)
0
CURRENT LIMIT (mV)
120
140
0.7
100
80
0.2 0.4
0.1
0.3 0.5
0.8
0.6 0.9
20
0
60
160
40
3789 G24
BUCK
BOOST
DUTY FACTOR (%)
0
50
CURRENT LIMIT (mV)
70
90
110
20
40
60 80
130
150
60
80
100
120
140
100
3789 G19
DUTY FACTOR (%)
0
50
CURRENT LIMIT (mV)
70
90
110
20
40
60 80
130
150
60
80
100
120
140
100
3789 G20
V
ITH
(V)
0
–200
CURRENT LIMIT (mV)
–100
0
100
0.5
1
1.5 2 2.5
200
–150
–50
50
150
3
3789 G22
V
ITH
(V)
0
–100
CURRENT LIMIT (mV)
0
100
0.5
1
1.5 2
200
–50
50
150
2.5
3789 G23
TEMPERATURE (°C)
–50
MAXIMUM CURRENT LIMIT (mV)
120
130
140
90
110
100
–10 30
–30
10 50
110
70 130
70
60
90
150
80
3789 G21
BUCK
BOOST