LTC3371_15 Datasheet, PDF (8/26 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.
PMOS R_DS(ON) vs Temperature
550
V_IN = 2.25V
500
V_IN = 3.3V
450
V_IN = 5.5V
400
350
300
250
200
150
–55 –25
5 35 65 95
TEMPERATURE (°C)
125 155
3371 G19
1A Buck Power Loss vs I_LOAD,
V_OUT = 1.2V
1000
BURST MODE
900 _{VOUT = 1.2V}
800 ^fOSC ^{= 2MHz}
L = 2.2µH
700
600
500
400
300
200
100
0
1
V_IN = 2.25V
V_IN = 3.3V
V_IN = 5.5V
10
100
LOAD CURRENT (mA)
1000
3371 G22
1A Buck Efficiency vs I_LOAD,
V_OUT = 2.5V
100
90 _BURST
80 ^MODE
70
60
V_IN = 2.7V
50
V_IN = 3.3V
40
V_IN = 5.5V
V_IN = 2.7V
30
V_IN = 3.3V
20
V_IN = 5.5V
V_OUT = 2.5V
10
FORCED
f_OSC = 2MHz
CONTINUOUS MODE L = 2.2µH
0
1
10
100
1000
LOAD CURRENT (mA)
3371 G25
8
NMOS R_DS(ON) vs Temperature
450
V_IN = 2.25V
400
V_IN = 3.3V
V_IN = 5.5V
350
300
250
200
150
–55 –25
5 35 65 95
TEMPERATURE (°C)
125 155
3371 G20
1A Buck Efficiency vs I_LOAD,
V_OUT = 1.8V
100
90
80 BURST
MODE
70
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
V_OUT = 1.8V
10
FORCED f_OSC = 2MHz
CONTINUOUS MODE L = 2.2µH
0
1
10
100
1000
LOAD CURRENT (mA)
3371 G23
1A Buck Power Loss vs I_LOAD,
V_OUT = 2.5V
1000
BURST MODE
900 _{VOUT = 2.5V}
800 ^fOSC ^{= 2MHz}
L = 2.2µH
700
600
500
400
300
200
100
0
1
V_IN = 2.7V
V_IN = 3.3V
V_IN = 5.5V
10
100
LOAD CURRENT (mA)
1000
3371 G26
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1A Buck Efficiency vs I_LOAD,
V_OUT = 1.2V
100
90
80 _BURST
70 ^MODE
60 _FORCED
50 ^CONTINUOUS
MODE
40
30
20
10
0
1
10
V_OUT = 1.2V
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 G21
1A Buck Power Loss vs I_LOAD,
V_OUT = 1.8V
1000
BURST MODE
900 _{VOUT = 1.8V}
800 ^fOSC ^{= 2MHz}
L = 2.2µH
700
600
500
400
300
200
100
0
1
V_IN = 2.25V
V_IN = 3.3V
V_IN = 5.5V
10
100
LOAD CURRENT (mA)
1000
3371 G24
1A Buck Efficiency vs I_LOAD,
V_OUT = 3.3V
100
90
80
BURST
70 _MODE
60
50
40
30
V_IN = 4.2V
V_IN = 5.5V
V_IN = 4.2V
V_IN = 5.5V
20
V_OUT = 3.3V
10
FORCED
f_OSC = 2MHz
CONTINUOUS MODE
L = 2.2µH
0
1
10
100
1000
LOAD CURRENT (mA)
3371 G27
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