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| 型號： | MIC5191BMM |
| 廠商： | MICREL INC |
| 元件分類： | 模擬信號調(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 |
| 文件頁數(shù)： | 6/13頁 |
| 文件大小： | 182K |
| 代理商： | MIC5191BMM |
MIC51
9
1
Functional Diagram
M
icrel
A
pril
200
4
6
M
9999-
0
4
2
8
0
4
Figure 1. MIC5191 Block Diagram
Functional Description
VIN
T
he
VIN
pin
is
connected
to
the
N
-
C
hannel
drain
. VIN
is
the
input
power
being
supplied
to
the
output
. T
his
pin
is
also
used
to
power
the
internal
current
limit
comparator
and
compare
the
ISENSE
voltage
for
current
limit
. T
he
voltage
range
is
from
1.0V
min
to
5.5V
max
.
ISENSE
T
he
ISENSE
pin
is
the
other
input
to
the
current
limit
com-
parator
. T
he
output
current
is
limited
when
the
ISENSE
pin's
voltage
is
50
m
V
less
than
the
VIN
pin
. I
n
cases
where
there
is
a
current
limited
source
and
there
isn’t
a
need
for
current
limit,
this
pin
can
be
tied
directly
to
VIN. I
ts
operating
voltage
range,
li
k
e
the
VIN
pin,
is
1.0V
min
to
5.5V
max
.
VCC1, VCC2
VCC1
supplies
the
error
amplifier
and
internal
reference,
while
VCC2
supplies
the
output
gate
drive
. F
or
this
reason,
ensure
these
pins
have
good
input
capacitor
bypassing
for
better
performance
. T
he
operating
range
is
from
4
.5V
to
13.2V
and
both
VCC
pins
should
be
tied
together
. E
nsure
that
the
voltage
supplied
is
greater
than
a
gate-source
threshold
above
the
output
voltage
for
the
N
-
C
hannel
MOSFET
se-
lected
.
Output
T
he
output
drives
the
external
N
-
C
hannel
MOSFET
and
is
powered
from
V
CC
. T
he
output
can
sin
k
and
source
over
150
m
A
of
current
to
drive
either
an
N
-
C
hannel
MOSFET
or
an
external
NPN
transistor
. T
he
output
drive
also
has
short-
circuit
current
protection
.
Enable
T
he
MIC51
9
1
comes
with
an
active-high
enable
pin
that
allows
the
regulator
to
be
disabled
. F
orcing
the
enable
pin
low
disables
the
regulator
and
sends
it
into
a
low
off-mode-
current
state
. F
orcing
the
enable
pin
high
enables
the
output
voltage
. T
he
enable
pin
cannot
be
left
floating;
a
floating
enable
pin
may
cause
an
indeterminate
state
on
the
output
.
FB
T
he
feedbac
k
pin
is
used
to
sense
the
output
voltage
for
regulation
. T
he
feedbac
k
pin
is
compared
to
an
internal
1.0V
reference
and
the
output
adjusts
the
gate
voltage
accordingly
to
maintain
regulation
. S
ince
the
feedbac
k
biasing
current
is
typically
13
μ
A
,
smaller
feedbac
k
resistors
should
be
used
to
minimize
output
voltage
error
.
COMP
COMP
is
the
external
compensation
pin
. T
his
allows
com-
plete
control
over
the
loop
to
allow
stability
for
any
type
of
output
capacitor,
load
currents
and
output
voltage
. A
detailed
explanation
of
how
to
compensate
the
MIC51
9
1
is
in
the
“
D
esigning
with
the
MIC51
9
1
”
section
.
SGND, PGND
SGND
is
the
internal
signal
ground
which
provides
an
iso-
lated
ground
path
from
the
high
current
output
driver
. T
he
signal
ground
provides
the
grounding
for
noise
sensitive
circuits
such
as
the
current
limit
comparator,
error
amplifier
and
the
internal
reference
voltage
.
PGND
is
the
power
ground
and
is
the
grounding
path
for
the
output
driver
.
OUTPUT
CONTRO
L
AND
L
EVE
L
S
H
IFT
CURRENT
L
IMIT
AMP
L
IFIER
ERROR
AMP
L
IFIER
ENAB
L
E
VIN
IS
VCC2
OUT
PGND
FB
1V
50
m
V
SGND
EN
VCC1
COMP
INTERNA
L
VO
L
TAGE
REGU
L
ATOR
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