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LTC3780_12 Datasheet, PDF (6/28 Pages) Linear Technology – High Effi ciency, Synchronous, 4-Switch Buck-Boost Controller | |||
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LTC3780
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted.
Efï¬ciency vs Output Current
(Boost Operation)
100
BURST
90
DCM
80
70
CCM
60
50
40
0.01
VIN = 6V
VOUT = 12V
0.1
1
10
ILOAD (A)
3780 G01
Supply Current vs Input Voltage
2500
2000
VFCB = 0V
1500
STANDBY
1000
500
SHUTDOWN
0
0 5 10 15 20 25 30 35
INPUT VOLTAGE (V)
3780 G04
INTVCC and EXTVCC Switch
Voltage vs Temperature
6.05
6.00
INTVCC VOLTAGE
5.95
5.90
5.85
5.80
5.75
5.70
5.65
EXTVCC SWITCHOVER THRESHOLD
5.60
5.55
â75 â50 â25 0 25 50 75 100 125
TEMPERATURE (°C)
3780 G07
Efï¬ciency vs Output Current
100
BURST
90
80
DCM
CCM
70
60
50
40
0.01
VIN = 12V
VOUT = 12V
0.1
1
10
ILOAD (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
EXTVCC Switch Resistance
vs Temperature
5
4
3
2
1
0
â75 â50 â25 0 25 50 75 100 125
TEMPERATURE (°C)
3780 G08
Efï¬ciency vs Output Current
(Buck Operation)
100
90
SC
80
CCM
70
DCM
60
50
40
0.01
VIN = 18V
VOUT = 12V
0.1
1
10
ILOAD (A)
3780 G03
EXTVCC Voltage Drop
120
100
80
60
40
20
0
0
10
20
30
40
50
CURRENT (mA)
3780 G06
Load Regulation
0
â0.1
VIN = 18V
â0.2
VIN = 12V
â0.3
VIN = 6V
â0.4
FCB = 0V
VOUT = 12V
â0.5
0
1
2
3
4
5
LOAD CURRENT (A)
3780 G09
3780fe
6
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