Datasheet
LTC3375
10
3375fc
For more information www.linear.com/3375
Typical perForMance characTerisTics
1A Buck Regulator Load Regulation
(Forced Continuous Mode)
4A Buck Regulator Load Regulation
(Forced Continuous Mode)
1A Buck Regulator Line Regulation
(Forced Continuous Mode)
1A Buck Regulator No Load
Startup Transient (Burst Mode)
4A Buck Regulator No Load
Startup Transient
(Forced Continuous Mode)
1A Buck Efficiency vs Frequency
(Forced Continuous Mode)
1A Buck Efficiency vs Frequency
(Forced Continuous Mode)
1A Buck Efficiency vs I
LOAD
(Across Operating Frequency)
V
IN
= 2.25V
V
IN
= 3.3V
V
IN
= 5.5V
FREQUENCY (MHz)
1
EFFICIENCY (%)
50
80
3
3375 G29
30
20
10
0
1.8
2.2
2.6
1.2
21.61.4
2.4
2.8
100
40
60
70
90
V
OUT
= 1.8V
I
L
= 100mA
L = 3.3µH
Burst Mode OPERATION
LOAD CURRENT(mA)
1
EFFICIENCY (%)
50
80
1000
3375 G31
30
20
10
0
10010
100
40
60
70
90
V
OUT
= 1.8V
V
IN
= 3.3V
f
OSC = 2MHz, L = 2.2µH
f
OSC = 3MHz, L = 1µH
f
OSC = 1MHz, L = 3.3µH
f
OSC = 3MHz, L = 1µH
f
OSC = 2MHz, L = 2.2µH
f
OSC = 1MHz, L = 3.3µH
FORCED CONTINUOUS MODE
I
L
= 100mA
I
L
= 500mA
I
L
= 20mA
FREQUENCY (MHz)
1
EFFICIENCY (%)
50
80
3
3375 G30
30
20
10
0
1.4 1.8 2.4 2.61.2 1.6 2 2.2 2.8
100
40
60
70
90
V
OUT
= 1.8V
V
IN
= 3.3V
L = 3.3µH
V
IN
= 5.5V
DROPOUT
V
IN
= 3.3V
V
IN
= 2.25V
I
L
(mA)
1
V
OUT
(V)
1.8
1.812
1000
3375 G32
1.792
1.788
1.784
1.78
10010
1.82
1.796
1.804
1.808
1.816
f
OSC
= 2MHz
L = 2.2µH
V
IN
= 5.5V
DROPOUT
V
IN
= 3.3V
V
IN
= 2.25V
I
L
(mA)
1
V
OUT
(V)
1.8
1.812
1000
3375 G33
1.792
1.788
1.784
1.78
10010
1.82
1.796
1.804
1.808
1.816
f
OSC
= 2MHz
L = 2.2µH
I
L
= 100mA
I
L
500mA
V
IN
(V)
2.25 2.75
V
OUT
(V)
1.81
5.254.25 4.75
3375 G34
1.79
1.785
1.78
3.753.25
1.82
1.795
1.8
1.805
1.815
f
OSC
= 2MHz
L = 2.2µH
200µs/DIV
V
OUT
500mV/DIV
EN
2V/DIV
INDUCTOR
CURRENT
500mA/DIV
3375 G35
200µs/DIV
V
OUT
500mV/DIV
EN
2V/DIV
INDUCTOR
CURRENT
500mA/DIV
3375 G36
4A Buck Efficiency vs I
LOAD
V
OUT
= 2.5V
f
OSC
= 2MHz
L = 2.2µH
V
IN
= 3.3V
V
IN
= 5.5V
V
IN
= 2.7V
V
IN
= 5.5V
V
IN
= 3.3V
V
IN
= 2.7V
FORCED CONTINUOUS MODE
Burst Mode
OPERATION
LOAD CURRENT(mA)
1
EFFICIENCY (%)
50
80
1000
3375 G28
30
20
10
0
10010
100
40
60
70
90