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LTM4627
5
4627fc
For more information www.linear.com/LTM4627
TYPICAL PERFORMANCE CHARACTERISTICS
Burst Mode Efficiency Pulse-Skipping Mode Efficiency
1.0V Transient Response
1.2V Transient Response 1.5V Transient Response 1.8V Transient Response
Efficiency vs Load Current
with 5V
IN
Efficiency vs Load Current
with 8V
IN
Efficiency vs Load Current
with 12V
IN
0
50
EFFICIENCY (%)
55
65
70
75
85
4
8
10
4627 G01
60
90
100
95
80
2 6
12
14 16
1V
OUT
AT
400kHz
1.2V
OUT
AT
400kHz
1.5V
OUT
AT
400kHz
2.5V
OUT
AT
400kHz
3.3V
OUT
AT
650kHz
LOAD CURRENT (A)
0
EFFICIENCY (%)
65
70
75
85
4
8
10
4627 G02
50
60
55
90
100
95
80
2 6
12
14 16
1V
OUT
AT 400kHz
1.2V
OUT
AT 400kHz
1.5V
OUT
AT 400kHz
2.5V
OUT
AT 500kHz
3.3V
OUT
AT 600kHz
5V
OUT
AT 600kHz
LOAD CURRENT (A)
0
50
EFFICIENCY (%)
55
65
70
75
85
4
8
10
4627 G03
60
90
100
95
80
2 6
12
14 16
1V
OUT
AT 400kHz
1.2V
OUT
AT 400kHz
1.5V
OUT
AT 400kHz
2.5V
OUT
AT 650kHz
3.3V
OUT
AT 650kHz
5V
OUT
AT 700kHz
LOAD CURRENT (A)
V
IN
= 12V, V
OUT
= 1.0V,
C
FF
= 82pF, C
COMP
= 33pF
OUTPUT CAPACITOR = 5 × 100µF CERAMIC X5R
100µs/DIV
4627 G06
50mV/DIV
0A TO 7.5A
LOAD STEP
V
IN
= 12V, V
OUT
= 1.2V,
C
FF
= 82pF, C
COMP
= 33pF
OUTPUT CAPACITOR = 5 × 100µF CERAMIC X5R
100µs/DIV
4627 G07
50mV/DIV
0A TO 7.5A
LOAD STEP
V
IN
= 12V, V
OUT
= 1.5V,
C
FF
= 82pF, C
COMP
= 33pF
OUTPUT CAPACITOR = 5 × 100µF CERAMIC X5R
100µs/DIV
4627 G08
50mV/DIV
0A TO 7.5A
LOAD STEP
V
IN
= 12V, V
OUT
= 1.8V,
C
FF
= 82pF, C
COMP
= 33pF
OUTPUT CAPACITOR = 4 × 100µF CERAMIC X5R
100µs/DIV
4627 G09
50mV/DIV
0A TO 7.5A
LOAD STEP
0.1
EFFICIENCY (%)
50
70
0.50.2
1.5
2
4627 G04
40
80
100
90
60
1
LOAD CURRENT (A)
12V
IN
, 2.5V
OUT
Burst Mode OPERATION
5V
IN
, 2.5V
OUT
Burst Mode OPERATION
0.1
EFFICIENCY (%)
50
70
0.50.2
1.5
2
4627 G05
40
80
100
90
60
1
5V
IN
, 2.5V
OUT
PULSE-SKIPPING MODE
LOAD CURRENT (A)
12V
IN
, 2.5V
OUT
PULSE-SKIPPING MODE