ltc3612 Linear Technology Corporation, ltc3612 Datasheet - Page 5

• Manufacturer Part Number: ltc3612
• Description: 3a, 4mhz Monolithic Synchronous Step-down Dc/dc Converter
• Manufacturer: Linear Technology Corporation

TYPICAL PERFORMANCE CHARACTERISTICS
200mA/DIV
20mV/DIV
–0.2
–0.3
–0.1
100
0.3
0.2
0.1
90
80
70
60
50
30
40
V
0
OUT
2.20
2.25
Effi ciency vs Input Voltage
(V
Line Regulation
I
L
Forced Continuous Mode Operation
V
I
V
MODE
OUT
OUT
MODE
2.75
2.75
= 100mA
= 1.8V
= 1.5V
= 0V)
3.25
3.30
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
3.75
3.85
1μs/DIV
4.25
4.40
I
I
I
I
OUT
OUT
OUT
OUT
V
4.75
OUT
= 3mA
= 300mA
= 1A
= 3A
4.95
= 1.8V
5.25
3612 G07
3612 G04
3612 G10
5.50
500mA/DIV
20mV/DIV
200mV/DIV
1A/DIV
V
95
94
93
92
91
90
89
88
87
83
82
86
85
84
OUT
V
OUT
I
0.5
L
Effi ciency vs Frequency
(V
I
L
Burst Mode Operation
V
I
V
OUT
Load Step Transient in
Pulse-Skipping Mode
OUT
MODE
V
I
V
COMPENSATION FIGURE 1
MODE
LOAD
OUT
MODE
1.0
= 75mA
= 1.8V
= 1.8V
= 0V
= 100mA TO 3A
= 3.3V
= 0V), I
1.5
FREQUENCY (MHz)
2.0
20μs/DIV
OUT
50μs/DIV
2.5
= 1A
3.0
V
3.5
OUT
1μH
0.68μH
0.33μH
= 1.8V
V
4.0
3612 G05
IN
3612 G08
3612 G11
= 3.3V, RT/SYNC = SV
4.5
500mA/DIV
200mV/DIV
20mV/DIV
–0.3
–0.1
1.5
1.1
0.9
0.7
0.5
0.1
1.3
0.3
1A/DIV
V
V
OUT
OUT
0
I
Load Regulation
I
L
L
V
OUT
Pulse-Skipping Mode Operation
V
I
V
Load Step Transient in Burst
Mode Operation
V
I
V
COMPENSATION FIGURE 1
OUT
LOAD
OUT
MODE
OUT
MODE
500
= 1.8V
= 75mA
= 1.8V
= 1.8V
= 100mA TO 3A
= 3.3V
= 0V
FORCED CONTINUOUS MODE
INTERNAL Burst Mode OPERATION
PULSE-SKIPPING MODE
OUTPUT CURRENT (mA)
IN
1000
unless otherwise noted.
1500
20μs/DIV
50μs/DIV
LTC3612
2000
2500
3612 G06
5
3612 G09
3612 G12
3612f
3000