Datasheet

LTC3612
5
3612fb
For more information www.linear.com/LTC3612
TYPICAL PERFORMANCE CHARACTERISTICS
Efficiency vs Load Current
(V
MODE
= 0V)
Efficiency vs Load Current
(V
MODE
= 0V)
Efficiency vs Load Current
Efficiency vs Input Voltage
(V
MODE
= 0V)
Efficiency vs Frequency
(V
MODE
= 0V), I
OUT
= 1A
Load Regulation
Line Regulation Burst Mode Operation
OUTPUT CURRENT (mA)
30
EFFICIENCY (%)
90
100
20
10
80
50
70
60
40
1 100 1000 10000
3612 G01
0
10
V
IN
= 5V
V
IN
= 3.3V
V
IN
= 2.5V
V
OUT
= 1.8V
OUTPUT CURRENT (mA)
30
EFFICIENCY (%)
90
100
20
10
80
50
70
60
40
1 100 1000 10000
3612 G02
0
10
V
IN
= 5V
V
IN
= 3.3V
V
IN
= 2.5V
V
OUT
= 1.2V
OUTPUT CURRENT (mA)
30
EFFICIENCY (%)
90
100
20
10
80
50
70
60
40
1 100 1000 10000
3612 G03
0
10
Burst Mode
EXTERNAL
CLAMP = 0.7V
Burst Mode
INTERNAL
CLAMP
PULSE-
SKIPPING
MODE
FORCED
CONTINUOUS
MODE
V
OUT
= 1.8V
INPUT VOLTAGE (V)
2.25
30
EFFICIENCY (%)
40
60
70
80
100
3612 G04
50
90
3.75
3.25
5.25
2.75
4.25 4.75
I
OUT
= 3mA
I
OUT
= 300mA
I
OUT
= 1A
I
OUT
= 3A
V
OUT
= 1.8V
FREQUENCY (MHz)
0.5
82
EFFICIENCY (%)
83
84
85
86
95
89
91
93
94
92
88
90
1.0
1.5 2.0 3.02.5 3.5
3612 G05
4.0 4.5
87
1µH
0.68µH
0.33µH
V
OUT
= 1.8V
OUTPUT CURRENT (mA)
0
–0.3
V
OUT
ERROR (%)
–0.1
0.3
0.5
0.7
2000
1.5
3612 G06
0.1
1000
500
2500
1500 3000
0.9
1.1
1.3
FORCED CONTINUOUS MODE
INTERNAL Burst Mode OPERATION
PULSE-SKIPPING MODE
V
OUT
= 1.8V
INPUT VOLTAGE (V)
2.20
–0.3
V
OUT
ERROR (%)
–0.2
–0.1
0
0.1
0.3
2.75
3.30 3.85 4.40
3612 G07
4.95 5.50
0.2
V
OUT
20mV/DIV
I
L
500mA/DIV
20µs/DIV
3612 G08
V
OUT
= 1.8V
I
OUT
= 75mA
V
MODE
= 0V
V
IN
= 3.3V, RT/SYNC = SV
IN
, unless otherwise noted.