LTC3780EG Datasheet, PDF (8/30 Pages) Linear Technology – High Efficiency, Synchronous,4-Switch Buck-Boost Controller

LTC3780
Typical Performance Characteristics T_A = 25°C, unless otherwise noted.
Oscillator Frequency
vs Temperature
450
400
V_PLLFLTR = 2.4V
350
V_PLLFLTR = 1.2V
300
250
V_PLLFLTR = 0V
200
150
100
50
0
–75 –50 –25 0 25 50 75 100 125
TEMPERATURE (°C)
3780 G19
Maximum Current Sense
Threshold vs Duty Factor (Boost)
180
160
140
120
100
0
20
40
60
80 100
DUTY FACTOR (%)
3780 G22
Peak Current Threshold
vs V_ITH (Boost)
200
150
100
50
0
–50
–100
0
0.4 0.8 1.2 1.6
V_ITH (V)
1.8 2.4
3780 G25
8
Undervoltage Reset
vs Temperature
4.2
4.0
3.8
3.6
3.4
3.2
3.0
–75 –50 –25 0 25 50 75 100 125
TEMPERATURE (°C)
3780 G20
Maximum Current Sense
Threshold vs Duty Factor (Buck)
140
130
120
110
0
20
40
60
80
100
DUTY FACTOR (%)
3780 G23
Valley Current Threshold
vs V_ITH (Buck)
100
50
0
–50
–100
–150
0
0.4 0.8 1.2 1.6
V_ITH (V)
2.0 2.4
3780 G26
For more information www.linear.com/LTC3780
Minimum Current Sense
Threshold vs Duty Factor (Buck)
–20
–40
–60
–80
100
80
60
40
20
0
DUTY FACTOR (%)
3780 G21
Minimum Current Sense
Threshold vs Temperature
200
BOOST
150
100
50
0
–50
–100
BUCK
–150
–75 –50 –25 0 25 50 75 100 125
TEMPERATURE (°C)
3780 G24
Current Foldback Limit
200
160
120
BOOST
BUCK
80
40
0
0
0.2
0.4
0.6
0.8
V_OSENSE (V)
3780 G32
3780ff