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