Datasheet

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