LTC1871-1 LINER [Linear Technology], LTC1871-1 Datasheet - Page 8

• Manufacturer Part Number: LTC1871-1
• Description: High Effi ciency, Synchronous, 4-Switch Buck-Boost Controller
• Manufacturer: LINER [Linear Technology]

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