Datasheet

LTM4649
5
4649f
For more information www.linear.com/LTM4649
TYPICAL PERFORMANCE CHARACTERISTICS
5V
IN
, 1V
OUT
Load Transient 5V
IN
, 1.5V
OUT
Load Transient12V
IN
, 1V
OUT
Load Transient
12V
IN
, 1.5V
OUT
Load Transient 5V
IN
, 2.5V
OUT
Load Transient 12V
IN
, 2.5V
OUT
Load Transient
12V
IN
Efficiency 5V
IN
Efficiency
CCM, Burst Mode and Pulse-
Skipping Mode Efficiency
LOAD CURRENT (A)
0
90
95
100
8
4649 G01
85
80
2 4 6 10
75
70
65
EFFICIENCY (%)
V
OUT
= 1V, 450kHz
V
OUT
= 1.2V, 450kHz
V
OUT
= 1.5V, 450kHz
V
OUT
= 2.5V, 750kHz
V
OUT
= 3.3V, 750kHz
LOAD CURRENT (A)
0
90
95
100
8
4649 G02
85
80
2 4 6 10
75
70
65
EFFICIENCY (%)
V
OUT
= 1V, 450kHz
V
OUT
= 1.2V, 450kHz
V
OUT
= 1.5V, 450kHz
V
OUT
= 2.5V, 450kHz
V
OUT
= 3.3V, 450kHz
LOAD CURRENT (A)
0.01
40
EFFICIENCY (%)
50
60
70
80
0.1 1 10
4649 G03
30
20
10
0
90
100
CCM
PULSE-
SKIPPPING
Burst Mode
OPERATION
V
IN
= 12V
V
OUT
= 1.5V
V
OUT
100mV/DIV
AC
I
OUT
5A/DIV
AC
50µs/DIV
5V
IN
, 1V
OUT
, 5A TO 10A LOAD STEP
C
OUT
= 2 • 220µF 4V CERAMIC CAPACITOR
NO C
FF
CAPACITOR
4649 G04
V
OUT
100mV/DIV
AC
I
OUT
5A/DIV
AC
50µs/DIV
12V
IN
, 1V
OUT
, 5A TO 10A LOAD STEP
C
OUT
= 2 • 220µF 4V CERAMIC CAPACITOR
NO C
FF
CAPACITOR
4649 G05
V
OUT
100mV/DIV
AC
I
OUT
5A/DIV
AC
50µs/DIV
5V
IN
, 1.5V
OUT
, 5A TO 10A LOAD STEP
C
OUT
= 2 • 220µF 4V CERAMIC CAPACITOR
NO C
FF
CAPACITOR
4649 G06
V
OUT
100mV/DIV
AC
I
OUT
5A/DIV
AC
50µs/DIV
5V
IN
, 2.5V
OUT
, 5A TO 10A LOAD STEP
C
OUT
= 2 • 220µF 4V CERAMIC CAPACITOR
NO C
FF
CAPACITOR
4649 G08
V
OUT
100mV/DIV
AC
I
OUT
5A/DIV
AC
50µs/DIV
12V
IN
, 2.5V
OUT
, 5A TO 10A LOAD STEP, 750kHz
C
OUT
= 2 • 220µF 4V CERAMIC CAPACITOR
NO C
FF
CAPACITOR
4649 G09
V
OUT
100mV/DIV
AC
I
OUT
5A/DIV
AC
50µs/DIV
12V
IN
, 1.5V
OUT
, 5A TO 10A LOAD STEP
C
OUT
= 2 • 220µF 4V CERAMIC CAPACITOR
NO C
FF
CAPACITOR
4649 G07