Micrel mic28510, Manual

Page: 3 / 14

Micrel, Inc. MIC28510 4A Evaluation Board
March 2012
3
M9999-030712
hbwhelp@micrel.com or (408) 955-1690
MIC28510 0.8V to 5V/4A Evaluation Board Typical Characteristics
Efficiency (V
IN
= 48V)
vs. Output Current
10
20
30
40
50
60
70
80
90
100
0 1 2 3 4 5
OUTPUT CURRENT (A)
EF
F
ICI
ENCY (
%
)
6
5.0V
3.3V
2.5V
1.8V
1.5V
1.2V
1.0V
0.9V
0.8V
f
SW
= 250kHz
Thermal Derating
0
1
2
3
4
25 40 55 70 85 100
MAXIMUM AMBIENT TEMPERATURE
(°C)
L
O
AD CURRE
NT
(
A)
V
OUT
= 3.3V
fsw = 250kHz
L = 10µH
T
j_MAX
=125°C
V
IN
= 5V
V
IN
= 75V
V
IN
= 48V
Thermal Derating
0
1
2
3
4
25 40 55 70 85 100
MAXIMUM AMBIENT TEMPERATURE
(°C)
L
O
AD CURRE
NT
(
A)
V
OUT
= 5V
f
SW
= 250kHz
L = 10µH
T
j_MAX
= 125°C
V
IN
= 8V
V
IN
= 75V
V
IN
= 48V
Thermal Derating
Thermal Derating
0
1
2
3
4
25 40 55 70 85 100
MAXIMUM AMBIENT TEMPERATURE
(°C)
LO
AD CURRE
N
T
(
A
)
V
OUT
= 3.3V
f
SW
= 250kHz
L = 10µH
T
j_MAX
= 125°C
V
IN
=18V
V
IN
= 12V
V
IN
= 24V
Thermal Derating
0
1
2
3
4
25 40 55 70 85 100
MAXIMUM AMBIENT TEMPERATURE
(°C)
L
O
AD CURRE
N
T
(
A)
V
OUT
= 2.5V
f
SW
= 250kHz
L = 10µH
T
j_MAX
= 125°C
V
IN
=18V
V
IN
= 12V
V
IN
= 24V
0
L
1
2
3
4
25 40 55 70 85 100
MAXIMUM AMBIENT TEMPERATURE
(°C)
O
AD CURRE
NT
(
A)
V
OUT
= 5V
f
SW
= 250kHz
L = 10µH
T
j_MAX
= 125°C
V
IN
=18V
V
IN
= 24V
V
IN
= 12V
Die Temperature* :
The temperature measurement was taken at the hottest point on the MIC28510 case mounted on a 5 square inch 4 layer, 0.62”,
FR-4 PCB with 2oz. finish copper weight per layer, see Thermal Measurement section. Actual results will depend upon the size of the PCB, ambient
temperature and proximity to other heat emitting components.