LTC3370_15 Datasheet, PDF (9/24 Pages) Linear Technology – 4-Channel 8A Configurable Buck DC/DCs

LTC3370
Typical Performance Characteristics T_A = 25°C, unless otherwise noted.
2A Buck Efficiency vs I_LOAD,
V_OUT = 1.8V
100
90
80
70 ^{Burst Mode}
OPERATION
60
V_IN = 2.25V
50
V_IN = 3.3V
40
V_IN = 5.5V
V_IN = 2.25V
30
V_IN = 3.3V
20
V_IN = 5.5V
FORCED
V_OUT = 1.8V
10
CONTINUOUS fOSC = 2MHz
0
MODE
L = 2.2µH
1
10
100
1000
LOAD CURRENT (mA)
3370 G28
3A Buck Efficiency vs I_LOAD,
V_OUT = 2.5V
100
90
80
70
Burst Mode
OPERATION
60
V_IN = 2.7V
50
V_IN = 3.3V
40
V_IN = 5.5V
V_IN = 2.7V
30
V_IN = 3.3V
V_IN = 5.5V
20
FORCED
V_OUT = 2.5V
10
CONTINUOUS fOSC = 2MHz
0
MODE
L = 2.2µH
1
10
100
1000
LOAD CURRENT (mA)
3370 G31
1A Buck Efficiency vs I_LOAD
(Across Operating Frequency)
100
90
80
70
Burst Mode
OPERATION
V_OUT = 1.8V
V_IN = 3.3V
60
FORCED
50
CONTINUOUS
MODE
40
30
f_OSC = 1MHz, L = 3.3µH
f_OSC = 2MHz, L = 2.2µH
20
f_OSC = 3MHz, L = 1µH
f_OSC = 1MHz, L = 3.3µH
10
f_OSC = 2MHz, L = 2.2µH
0
f_OSC = 3MHz, L = 1µH
1
10
100
1000
LOAD CURRENT (mA)
3370 G34
2A Buck Efficiency vs I_LOAD,
V_OUT = 2.5V
100
90
80
70
Burst Mode
OPERATION
60
V_IN = 2.7V
50
V_IN = 3.3V
V_IN = 5.5V
40
V_IN = 2.7V
30
V_IN = 3.3V
V_IN = 5.5V
20
FORCED
V_OUT = 2.5V
10
CONTINUOUS fOSC = 2MHz
0
MODE
L = 2.2µH
1
10
100
1000
LOAD CURRENT (mA)
3370 G29
4A Buck Efficiency vs I_LOAD,
V_OUT = 1.8V
100
90
80
Burst Mode
70 OPERATION
60 ^FORCED
CONTINUOUS
50 _MODE
40
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
V_IN = 2.25V
V_IN = 3.3V
V_IN = 5.5V
100
1000
LOAD CURRENT (mA)
3370 G32
1A Buck Efficiency vs Frequency
(Forced Continuous Mode)
100
90
80
70 ^{VIN = 5.5V}
V_IN = 2.25V
V_IN = 3.3V
60
50
40
30
20 _{VOUT = 1.8V}
10 ILOAD = 100mA
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)
3370 G35
3A Buck Efficiency vs I_LOAD,
V_OUT = 1.8V
100
90
80
70
Burst Mode
OPERATION
60
50
V_IN = 2.25V
V_IN = 3.3V
40
V_IN = 5.5V
V_IN = 2.25V
30
V_IN = 3.3V
20
V_IN = 5.5V
FORCED
V_OUT = 1.8V
10
CONTINUOUS fOSC = 2MHz
0
MODE
L = 2.2µH
1
10
100
1000
LOAD CURRENT (mA)
3370 G30
4A Buck Efficiency vs I_LOAD,
V_OUT = 2.5V
100
90
80
Burst Mode
70 OPERATION
60 FORCED
CONTINUOUS
50 _MODE
V_OUT = 2.5V
f_OSC = 2MHz
L = 2.2µH
40
V_IN = 2.7V
30
V_IN = 3.3V
20
V_IN = 5.5V
V_IN = 2.7V
10
V_IN = 3.3V
0
V_IN = 5.5V
1
10
100
1000
LOAD CURRENT (mA)
3370 G33
1A Buck Efficiency vs Frequency
(Forced Continuous Mode)
100
V_IN = 3.3V
90
80
V_IN = 5.5V
70
V_IN = 2.25V
60
50
40
30
20 _{VOUT = 1.8V}
10 ILOAD = 200mA
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)
3370 G36
3370f
For more information www.linear.com/LTC3370
9