LTC1871-1 LINER [Linear Technology], LTC1871-1 Datasheet - Page 6

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

LTC3780
TYPICAL PERFORMANCE CHARACTERISTICS
6
1500
2500
2000
1000
6.05
6.00
5.95
5.90
5.85
5.80
5.75
5.70
5.65
5.60
5.55
500
100
90
80
70
60
50
40
0
0.01
–75 –50
0
Effi ciency vs Output Current
(Boost Operation)
Supply Current vs Input Voltage
INTV
Voltage vs Temperature
BURST
DCM
CCM
EXTV
5
CC
and EXTV
–25
CC
10
INPUT VOLTAGE (V)
TEMPERATURE (°C)
SWITCHOVER THRESHOLD
SHUTDOWN
0.1
INTV
V
STANDBY
FCB
0
15
I
CC
LOAD
= 0V
25
VOLTAGE
CC
20
(A)
Switch
50
1
25
75
V
V
IN
OUT
= 6V
30
100 125
= 12V
3780 G04
3780 G01
3780 G07
10
35
100
6.5
6.0
3.5
5.5
5.0
4.5
4.0
90
80
70
60
50
40
5
4
3
2
1
0
0.01
–75 –50 –25
0
Effi ciency vs Output Current
Internal 6V LDO Line Regulation
EXTV
vs Temperature
BURST
5
DCM
CC
Switch Resistance
10
INPUT VOLTAGE (V)
TEMPERATURE (°C)
0.1
CCM
0
15
I
LOAD
25
20
(A)
50
1
25
75
V
V
IN
OUT
30
= 12V
100 125
= 12V
T
3780 G05
3780 G08
3780 G02
A
= 25°C, unless otherwise noted.
35
10
–0.1
–0.4
–0.2
–0.3
–0.5
100
120
100
80
60
40
20
90
80
70
60
50
40
0
0
0.01
0
0
Effi ciency vs Output Current
(Buck Operation)
EXTV
Load Regulation
FCB = 0V
V
OUT
= 12V
CC
10
1
SC
Voltage Drop
LOAD CURRENT (A)
0.1
CURRENT (mA)
20
DCM
2
I
LOAD
CCM
(A)
30
3
V
1
IN
V
IN
= 6V
V
V
V
40
IN
OUT
= 18V
IN
4
= 18V
= 12V
= 12V
3780 G06
3780 G09
3780 G03
3780fe
10
50
5