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