LTC3612_15 Datasheet, PDF (5/30 Pages) Linear Technology – 3A, 4MHz Monolithic Synchronous Step-Down DC/DC Converter

LTC3612
Typical Performance Characteristics V_IN = 3.3V, RT/SYNC = SV_IN, unless otherwise noted.
Efficiency vs Load Current
(V_MODE = 0V)
100
V_OUT = 1.8V
90
80
70
60
50
40
30
20
V_IN = 5V
10
V_IN = 3.3V
0
V_IN = 2.5V
1
10
100
1000 10000
OUTPUT CURRENT (mA)
3612 G01
Efficiency vs Load Current
(V_MODE = 0V)
100
V_OUT = 1.2V
90
80
70
60
50
40
30
20
V_IN = 5V
10
V_IN = 3.3V
0
V_IN = 2.5V
1
10
100
1000 10000
OUTPUT CURRENT (mA)
3612 G02
Efficiency vs Load Current
100
V_OUT = 1.8V
90
80
70
Burst Mode
EXTERNAL
60
CLAMP = 0.7V
50
Burst Mode
INTERNAL
40
CLAMP
PULSE-
30
SKIPPING
20
MODE
FORCED
10
CONTINUOUS
MODE
0
1
10
100
1000 10000
OUTPUT CURRENT (mA)
3612 G03
Efficiency vs Input Voltage
(V_MODE = 0V)
100
V_OUT = 1.8V
90
80
70
60
50
I_OUT = 3mA
40
I_OUT = 300mA
I_OUT = 1A
I_OUT = 3A
30
2.25 2.75 3.25 3.75 4.25 4.75 5.25
INPUT VOLTAGE (V)
3612 G04
Efficiency vs Frequency
(V_MODE = 0V), I_OUT = 1A
95
94
V_OUT = 1.8V
93
92
91
90
89
88
87
86
85
84
1µH
83
0.68µH
0.33µH
82
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
FREQUENCY (MHz)
3612 G05
Load Regulation
1.5
FORCED CONTINUOUS MODE
1.3
INTERNAL Burst Mode OPERATION
PULSE-SKIPPING MODE
1.1
0.9
0.7
0.5
0.3
0.1
–0.1
V_OUT = 1.8V
–0.3
0 500 1000
1500
2000
2500
OUTPUT CURRENT (mA)
3000
3612 G06
Line Regulation
0.3
0.2
0.1
0
–0.1
–0.2
–0.3
2.20 2.75
3.30 3.85 4.40
INPUT VOLTAGE (V)
4.95 5.50
3612 G07
Burst Mode Operation
V_OUT
20mV/DIV
I_L
500mA/DIV
V_OUT = 1.8V
I_OUT = 75mA
V_MODE = 0V
20µs/DIV
3612 G08
For more information www.linear.com/LTC3612
3612fc
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