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