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| 型號(hào)： | MIC5191BMM |
| 廠商： | MICREL INC |
| 元件分類： | 模擬信號(hào)調(diào)理 |
| 英文描述： | Ultra High-Speed, High-Current Active Filter/LDO Controller |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDSO10 |
| 封裝： | MSOP-10 |
| 文件頁(yè)數(shù)： | 12/13頁(yè) |
| 文件大小： | 182K |
| 代理商： | MIC5191BMM |
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MIC51
9
1
M
icrel
A
pril
200
4
12
M
9999-
0
4
2
8
0
4
U
sing
the
MIC51
9
1
as
a
filter
for
a
switching
regulator
reduces
output
noise
due
to
ripple
and
high
frequency
switch-
ing
noise
. I
t
also
reduces
undershoot
(
F
igure
12
)
and
over-
shoot
(
F
igure
13
)
due
to
load
transients
with
decreased
capacitance
.
Figure 13. Transient Response
D
ue
to
the
high
DC
gain
(8
0
d
B
)
of
the
MIC51
9
1
,
it
also
adds
increased
output
accuracy
and
extremely
high
load
regula-
tion
.
Distributed Power Supply
A
s
technology
advances
and
processes
move
to
smaller
and
smaller
geometries,
voltage
requirements
go
down
and
cur-
rent
requirements
go
up
. T
his
creates
unique
challenges
when
trying
to
supply
power
to
multiple
devices
on
a
board
.
When
there
is
one
load
to
power,
the
difficulties
are
not
quite
as
complex;
trying
to
distribute
power
to
multiple
loads
from
one
supply
is
much
more
problematic
.
I
f
a
large
circuit
board
has
multiple
small-geometry
ASIC
s,
it
will
require
the
powering
of
multiple
loads
with
its
one
power
source
. A
ssuming
that
the
ASIC
s
are
dispersed
throughout
the
board
and
that
the
core
voltage
requires
a
regulated
1V
,
F
igure
1
4
shows
the
long
traces
from
the
power
supply
to
the
loads
. N
ot
only
do
we
have
to
contend
with
the
tolerance
of
the
supply
(line
regulation,
load
regulation,
output
accuracy
and
temperature
tolerances),
but
the
trace
lengths
create
additional
issues
with
resistance
and
inductance
.
With
lower
voltages
these
parasitic
values
can
easily
bump
output
voltage
out
of
a
usable
tolerance
.
Load
Load
S
witching
P
ower
S
upply
Circuit Board
Load
Load
Long
T
races
Figure 14. Board Layout
B
ut
by
placing
multiple,
small
MIC51
9
1
circuits
close
to
each
load,
the
parasitic
trace
elements
caused
by
distance
to
the
power
supply
are
almost
completely
negated
. B
y
adjusting
the
switching
supply
voltage
to
1.2V
,
for
example,
the
MIC51
9
1
will
provide
accurate
1V
output,
efficently
and
with
very
little
noise
.
Figure 15. Improved Distributed Supplies
Load
Load
S
witching
P
ower
S
upply
Circuit Board
Load
Load
MIC51
9
1
MIC51
9
1
MIC51
9
1
MIC51
9
1
TIME
(
100
μ
s/div)
I
(
1
m
V
/
L
O
(
1
m
V
/
(
5
/
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