LTC3371_15 Datasheet, PDF (9/26 Pages) Linear Technology – 4-Channel 8A Configurable Buck DC/DCs with Watchdog and Power-On Reset

LTC3371
Typical Performance Characteristics T_A = 25°C unless otherwise noted.
1A Buck Power Loss vs I_LOAD,
V_OUT = 3.3V
1000
BURST MODE
900 _{VOUT = 3.3V}
800 ^fOSC ^{= 2MHz}
L = 2.2µH
700
600
500
400
300
200
V_IN = 4.2V
100
V_IN = 5.5V
0
1
10
100
1000
LOAD CURRENT (mA)
3371 G28
3A Buck Efficiency vs I_LOAD,
V_OUT = 1.8V
100
90
80 _{BURST MODE}
70 _FORCED
60 CONTINUOUS
50 ^MODE
V_OUT = 1.8V
f_OSC = 2MHz
L = 2.2µH
40
V_IN = 2.25V
30
V_IN = 3.3V
20
V_IN = 5.5V
V_IN = 2.25V
10
V_IN = 3.3V
0
V_IN = 5.5V
1
10
100
1000
LOAD CURRENT (mA)
3371 G31
4A Buck Efficiency vs I_LOAD,
V_OUT = 2.5V
100
90
80 ^{BURST MODE}
70
60
50
40 ^FORCED
CONTINUOUS
30 MODE
20
10
0
1
10
V_OUT = 2.5V
f_OSC = 2MHz
L = 2.2µH
V_IN = 2.7V
V_IN = 3.3V
V_IN = 5.5V
V_IN = 2.7V
V_IN = 3.3V
V_IN = 5.5V
100
1000
LOAD CURRENT (mA)
3371 G34
2A Buck Efficiency vs I_LOAD,
V_OUT = 1.8V
100 _{BURST MODE}
90
80
70 FORCED
CONTINUOUS
60 _MODE
50
V_OUT = 1.8V
f_OSC = 2MHz
L = 2.2µH
40
V_IN = 2.25V
30
V_IN = 3.3V
20
V_IN = 5.5V
V_IN = 2.25V
10
V_IN = 3.3V
0
V_IN = 5.5V
1
10
100
1000
LOAD CURRENT (mA)
3371 G29
3A Buck Efficiency vs I_LOAD,
V_OUT = 2.5V
100
90
80 _{BURST MODE}
70
60
50 FORCED
40
CONTINUOUS
MODE
30
20
10
0
1
10
V_OUT = 2.5V
f_OSC = 2MHz
L = 2.2µH
V_IN = 2.7V
V_IN = 3.3V
V_IN = 5.5V
V_IN = 2.7V
V_IN = 3.3V
V_IN = 5.5V
100
1000
LOAD CURRENT (mA)
3371 G32
1A Buck Efficiency vs I_LOAD
(Across Operating Frequency)
100
90
80 _{BURST MODE}
70
60
FORCED
CONTINUOUS
50 ^MODE
V_OUT = 1.8V
V_IN = 3.3V
40
f_OSC = 1MHz, L = 3.3µH
30
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)
3371 G35
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2A Buck Efficiency vs I_LOAD,
V_OUT = 2.5V
100
90
80 _{BURST MODE}
70
60 _FORCED
50 ^CONTINUOUS
MODE
40
30
20
10
0
1
10
V_OUT = 2.5V
f_OSC = 2MHz
L = 2.2µH
V_IN = 2.7V
V_IN = 3.3V
V_IN = 5.5V
V_IN = 2.7V
V_IN = 3.3V
V_IN = 5.5V
100
1000
LOAD CURRENT (mA)
3371 G30
4A Buck Efficiency vs I_LOAD,
V_OUT = 1.8V
100
90
80 _{BURST MODE}
70
60
50 FORCED
CONTINUOUS
40 _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
V_IN = 2.25V
V_IN = 3.3V
V_IN = 5.5V
100
1000
LOAD CURRENT (mA)
3371 G33
1A Buck Efficiency vs Frequency
(Forced Continuous Mode)
100
V_IN = 2.25V
90
V_IN = 3.3V
80
70
60
V_IN = 5.5V
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)
3371 G36
3371fa
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