Datasheet
LTM4637
5
4637fc
For more information www.linear.com/LTM4637
Typical perForMance characTerisTics
Burst Mode Efficiency
vs Load Current
Pulse-Skipping Mode Efficiency
vs Load Current
1V 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
(Limit 5V Output to 15A)
Efficiency vs Load Current with
12V
IN
(Limit 5V Output to 15A)
LOAD CURRENT (A)
0
65
EFFICIENCY (%)
70
80
85
90
100
2
10
14
4637 G01
75
95
8
18
20
4
6
12 16
1V
OUT
, 250kHz, CCM
1.2V
OUT
, 250kHz, CCM
1.5V
OUT
, 350kHz, CCM
1.8V
OUT
, 350kHz, CCM
2.5V
OUT
, 450kHz, CCM
3.3V
OUT
, 600kHz, CCM
LOAD CURRENT (A)
0
65
EFFICIENCY (%)
70
80
85
90
100
2
10
14
4637 G02
75
95
8
18
20
4
6
12 16
1V
OUT
, 250kHz, CCM
1.2V
OUT
, 250kHz, CCM
1.5V
OUT
, 350kHz, CCM
1.8V
OUT
, 350kHz, CCM
2.5V
OUT
, 450kHz, CCM
3.3V
OUT
, 600kHz, CCM
5V
OUT
, 600kHz, CCM
LOAD CURRENT (A)
0
65
EFFICIENCY (%)
70
80
85
90
100
2
10
14
4637 G03
75
95
8
18
20
4
6
12 16
1V
OUT
, 250kHz, CCM
1.2V
OUT
, 250kHz, CCM
1.5V
OUT
, 350kHz, CCM
1.8V
OUT
, 350kHz, CCM
2.5V
OUT
, 450kHz, CCM
3.3V
OUT
, 600kHz, CCM
5V
OUT
, 600kHz, CCM
LOAD CURRENT (A)
0
65
EFFICIENCY (%)
70
75
80
85
95
0.5
1 1.5 2
4637 G04
2.5 3
90
5V
IN
, 1.8V
OUT
, 350kHz
8V
IN
, 1.8V
OUT
, 350kHz
12V
IN
, 1.8V
OUT
, 350kHz
LOAD CURRENT (A)
0
60
65
EFFICIENCY (%)
70
75
80
85
95
0.5
1 1.5 2
4637 G05
2.5 3
90
5V
IN
, 1.8V
OUT
, 350k
8V
IN
, 1.8V
OUT
, 350k
12V
IN
, 1.8V
OUT
, 350k
OUTPUT
TRANSIENT
50mV/DIV
200µs/DIV
LOAD STEP
5A/DIV
200µs/DIVV
IN
= 12V
V
OUT
= 1V
I
OUT
= 0A TO 10A, C
FF
= 330pF
OUTPUT CAPACITORS:
3 × 470µF POSCAP CAPACITORS
2 × 100µF CERAMIC CAPACITORS
4637 G06
OUTPUT
TRANSIENT
50mV/DIV
200µs/DIV
LOAD STEP
5A/DIV
200µs/DIVV
IN
= 12V
V
OUT
= 1.2V
I
OUT
= 0A TO 10A, C
FF
= 330pF
OUTPUT CAPACITORS:
3 × 470µF POSCAP CAPACITORS
2 × 100µF CERAMIC CAPACITORS
4637 G07
OUTPUT
TRANSIENT
50mV/DIV
200µs/DIV
LOAD STEP
5A/DIV
200µs/DIVV
IN
= 12V
V
OUT
= 1.5V
I
OUT
= 0A TO 10A, C
FF
= 330pF
OUTPUT CAPACITORS:
3 × 470µF POSCAP CAPACITORS
2 × 100µF CERAMIC CAPACITORS
4637 G08
OUTPUT
TRANSIENT
50mV/DIV
200µs/DIV
LOAD STEP
5A/DIV
200µs/DIVV
IN
= 12V
V
OUT
= 1.8V
I
OUT
= 0A TO 10A, C
FF
= 330pF
OUTPUT CAPACITORS:
3 × 470µF POSCAP CAPACITORS
2 × 100µF CERAMIC CAPACITORS
4637 G09