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