LTC3374 Datasheet, PDF (9/24 Pages) Linear Technology – 8-Channel Parallelable 1A Buck DC/DCs

TYPICAL PERFORMANCE CHARACTERISTICS
LTC3374
4A Buck Efficiency vs I_LOAD
100
90
80
Burst Mode
70
OPERATION
60
50
FORCED
40
CONTINUOUS
MODE
30
20
10
0
1
10
V_OUT = 1.8V
f_OSC = 2MHz
L = 2.2µH
V_IN = 2.25V
V_IN = 3.3V
V_IN = 5.5V
100
1000
LOAD CURRENT (mA)
3374 G25
1A Buck Efficiency vs Frequency
(Forced Continuous Mode)
100
I_L = 100mA
90
80
I_L = 500mA
70
I_L = 20mA
60
50
40
30
20
V_OUT = 1.8V
V_IN = 3.3V
10
f_OSC = 2MHz
L = 3.3µH
0
1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 2.8 3
FREQUENCY (MHz)
3374 G28
4A Buck Efficiency vs I_LOAD
100
90
80
Burst Mode
70
OPERATION
60
FORCED
50
CONTINUOUS
MODE
40
V_OUT = 2.5V
30
f_OSC = 2MHz
L = 2.2µH
20
V_IN = 2.7V
10
V_IN = 3.3V
V_IN = 5.5V
0
1
10
100
1000
LOAD CURRENT (mA)
3374 G26
1A Buck Efficiency vs I_LOAD
(Across Operating Frequency)
100
90
80 _{Burst Mode}
70 ^OPERATION
60
FORCED
CONTINUOUS
MODE
50
V_OUT = 1.8V
40
V_IN = 3.3V
f_OSC = 1MHz
30
L = 3.3µH
20
f_OSC = 2MHz
L = 2.2µH
10
f_OSC = 3MHz
L = 1µH
0
1
10
100
1000
LOAD CURRENT (mA)
3374 G29
1A Buck Efficiency vs Frequency
(Forced Continuous Mode)
100
90
V_IN = 2.25V
80
V_IN = 3.3V
70
V_IN = 5.5V
60
50
40
30
20
V_OUT = 1.8V
I_L = 100mA
10
f_OSC = 2MHz
L = 3.3µH
0
1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 2.8 3
FREQUENCY (MHz)
3374 G27
1A Buck Regulator Load Regulation
(Forced Continuous Mode)
1.820 _{fOSC = 2MHz}
1.816 L = 2.2µH
1.812
1.808 ^VIN ^{= 5.5V}
1.804
V_IN = 3.3V
1.800
1.796 _{VIN = 2.25V}
1.792
1.788
1.784
DROPOUT
1.780
1
10
100
I_L (mA)
1000
3374 G30
4A Buck Regulator Load Regulation
(Forced Continuous Mode)
1.820
f_OSC = 2MHz
1.816 L = 2.2µH
1.812
1.808 ^VIN ^{= 5.5V}
1.804
V_IN = 3.3V
1.800
1.796 _{VIN = 2.25V}
1.792
1.788
1.784
DROPOUT
1.780
1
10
100
I_L (mA)
1000
3374 G31
1A Buck Regulator Line Regulation
(Forced Continuous Mode)
1.820 _{fOSC = 2MHz}
1.815 ^{L = 2.2µH}
1.810
1.805
1.800
1.795
I_L = 100mA
I_L = 500mA
1.790
1.785
1.780
2.25 2.75 3.25 3.75 4.25 4.75 5.25
V_IN (V)
3374 G32
3374f
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