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LTC3371_15 Datasheet, PDF (10/26 Pages) Linear Technology – 4-Channel 8A Configurable Buck DC/DCs with Watchdog and Power-On Reset
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LTC3371
Typical Performance Characteristics TA = 25°C unless otherwise noted.
1A Buck Efficiency vs Frequency
(Forced Continuous Mode)
100
VIN = 3.3V
90
VIN = 2.25V
80
VIN = 5.5V
70
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)
3371 G37
1A Buck Efficiency vs Frequency
(Forced Continuous Mode)
100
ILOAD = 100mA
90
80
ILOAD = 500mA
70
ILOAD = 20mA
60
50
40
30
20 VOUT = 1.8V
10 VIN = 3.3V
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 G38
1A Buck Regulator Load Regulation
(Forced Continuous Mode)
1.82
1.816
fOSC = 2MHz
L = 2.2µH
1.812
1.808
1.804 VIN = 5.5V
1.8 VIN = 3.3V
1.796 VIN = 2.25V
1.792
1.788
DROPOUT
1.784
1.78
1
10
100
LOAD CURRENT (mA)
1000
3371 G39
4A Buck Regulator Load Regulation
(Forced Continuous Mode)
1.82
1.816
fOSC = 2MHz
L = 2.2µH
1.812
1.808
1.804
1.8
VIN = 5.5V
VIN = 3.3V
1.796 VIN = 2.25V
1.792
1.788
1.784
DROPOUT
1.78
1
10
100
1000
LOAD CURRENT (mA)
3371 G40
1A Buck Regulator Line Regulation
(Forced Continuous Mode)
1.82
fOSC = 2MHz
1.815 L = 2.2µH
1A Buck Regulator No-Load Startup
Transient (Burst Mode Operation)
VIN = 3.3V
VOUT = 1.8V
1.81
1.805
1.8
1.795
1.79
1.785
ILOAD = 100mA
ILOAD = 500mA
VOUT
500mV/DIV
INDUCTOR
CURRENT
500mA/DIV
EN
2V/DIV
200µs/DIV
3371 G42
1.78
2.5 3 3.5 4 4.5 5 5.5
VIN (V)
3371 G41
1A Buck Regulator No-Load Startup
Transient (Forced Continuous Mode)
4A Buck Regulator No-Load Startup
Transient (Burst Mode Operation)
4A Buck Regulator No-Load Startup
Transient (Forced Continuous Mode)
VIN = 3.3V
VOUT = 1.8V
VOUT
500mV/DIV
INDUCTOR
CURRENT
500mA/DIV
EN
2V/DIV
200µs/DIV
VIN = 3.3V
VOUT = 1.8V
VOUT
500mV/DIV
INDUCTOR
CURRENT
500mA/DIV
3371 G43
EN
2V/DIV
200µs/DIV
VIN = 3.3V
VOUT = 1.8V
VOUT
500mV/DIV
INDUCTOR
CURRENT
500mA/DIV
3371 G44
EN
2V/DIV
200µs/DIV
3371 G45
3371fa
10
For more information www.linear.com/LTC3371
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