LTC3780EG Datasheet, PDF (6/30 Pages) Linear Technology – High Efficiency, Synchronous,4-Switch Buck-Boost Controller

LTC3780
Typical Performance Characteristics T_A = 25°C, unless otherwise noted.
Efficiency vs Output Current
(Boost Operation)
100
BURST
90
DCM
80
70
CCM
60
50
40
0.01
V_IN = 6V
V_OUT = 12V
0.1
1
10
I_LOAD (A)
3780 G01
Supply Current vs Input Voltage
2500
2000
V_FCB = 0V
1500
STANDBY
1000
500
SHUTDOWN
0
0 5 10 15 20 25 30 35
INPUT VOLTAGE (V)
3780 G04
INTV_CC and EXTV_CC Switch
Voltage vs Temperature
6.05
6.00
INTV_CC VOLTAGE
5.95
5.90
5.85
5.80
5.75
5.70
5.65
EXTV_CC SWITCHOVER THRESHOLD
5.60
5.55
–75 –50 –25 0 25 50 75 100 125
TEMPERATURE (°C)
3780 G07
Efficiency vs Output Current
100
BURST
90
80
DCM
CCM
70
60
50
40
0.01
V_IN = 12V
V_OUT = 12V
0.1
1
10
I_LOAD (A)
3780 G02
Internal 6V LDO Line Regulation
6.5
6.0
5.5
5.0
4.5
4.0
3.5
05
10 15 20 25 30 35
INPUT VOLTAGE (V)
3780 G05
EXTV_CC Switch Resistance
vs Temperature
5
4
3
2
1
0
–75 –50 –25 0 25 50 75 100 125
TEMPERATURE (°C)
3780 G08
Efficiency vs Output Current
(Buck Operation)
100
90
SC
80
CCM
70
DCM
60
50
40
0.01
V_IN = 18V
V_OUT = 12V
0.1
1
10
I_LOAD (A)
3780 G03
EXTV_CC Voltage Drop
120
100
80
60
40
20
0
0
10
20
30
40
50
CURRENT (mA)
3780 G06
Load Regulation
0
–0.1
V_IN = 18V
–0.2
V_IN = 12V
–0.3
V_IN = 6V
–0.4
FCB = 0V
V_OUT = 12V
–0.5
0
1
2
3
4
5
LOAD CURRENT (A)
3780 G09
3780ff
6
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