Datenblatt-Suchmaschine für elektronische Bauteile
  German  ▼
ALLDATASHEETDE.COM

X  

ILC7082 Datenblatt(PDF) 7 Page - Impala Linear Corporation

Teilenummer ILC7082
Bauteilbeschribung  150MA SOT-23 ULTRA LOW NOISE CMOS RF-LDO REGULATOR
Download  16 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Hersteller  IMPALA [Impala Linear Corporation]
Direct Link  
Logo IMPALA - Impala Linear Corporation

ILC7082 Datenblatt(HTML) 7 Page - Impala Linear Corporation

Back Button ILC7082 Datasheet HTML 3Page - Impala Linear Corporation ILC7082 Datasheet HTML 4Page - Impala Linear Corporation ILC7082 Datasheet HTML 5Page - Impala Linear Corporation ILC7082 Datasheet HTML 6Page - Impala Linear Corporation ILC7082 Datasheet HTML 7Page - Impala Linear Corporation ILC7082 Datasheet HTML 8Page - Impala Linear Corporation ILC7082 Datasheet HTML 9Page - Impala Linear Corporation ILC7082 Datasheet HTML 10Page - Impala Linear Corporation ILC7082 Datasheet HTML 11Page - Impala Linear Corporation Next Button
Zoom Inzoom in Zoom Outzoom out
 7 / 16 page
background image
150mA SOT-23 Ultra Low Noise CMOS RF-LDO™ Regulator
Impala Linear Corporation
7
(408) 574-3939
www.impalalinear.com
April 1999
ILC7082 1.3
Input Capacitor
An input capacitor C
IN of value 1
µF or larger should be con-
nected from V
IN to the main ground plane. This will help to
filter supply noise from entering the LDO. The input capaci-
tor should be connected as close to the LDO regulator input
pin as is practical. Using a high-value input capacitor will
offer superior line transient response as well as better pow-
er supply ripple rejection. A ceramic or tantalum capacitor
may be used at the input of the LDO regulator.
Note that there is a parasitic diode from the LDO regulator
output to the input. If the input voltage swings below the reg-
ulator’s output voltage by a couple of hundred milivolts then
the regulator may be damaged. This condition must be
avoided. In many applications a large value input capacitor,
C
IN, will hold VIN higher than V
OUT and decay slower than VOUT
when the LDO is powered off.
Output Capacitor Selection
Impala strongly recommends the use of low ESR (equiva-
lent series resistance) ceramic capacitors for C
OUT
and
C
NOISE The ILC7082 is stable with low ESR capacitor (as low
as zero
Ω). The value of the output capacitor should be 1µF
or higher. Either ceramic chip or a tantalum capacitor may
be used at the output.
Use of ceramic chip capacitors offer significant advantages
over tantalum capacitors. A ceramic capacitor is typically
cheaper than a tantalum capacitor, it usually has a smaller
footprint, lower height, and lighter weight than a tantalum
capacitor. Furthermore, unlike tantalum capacitors which are
polarized and can be damaged if connected incorrectly,
ceramic capacitors are non-polarized. Low value ceramic
chip capacitors with X5R or X7R dielectric are available in
the 100pF to 4.7mF range. Beware of using ceramic capaci-
tors with Y5V dielectric since their ESR increases significant-
ly at cold temperatures. Figure 12 shows a list of recom-
mended ceramic capacitors for use at the output of ILC7082.
Note: If a tantalum output capacitor is used then for stable
operation Impala recommends a low ESR tantalum capaci-
tor with maximum rated ESR at or below 0.4W. Low ESR
tantalum capacitors, such as the TPS series from AVX
Corporation (www.avxcorp.com) or the T495 series from
Kemet (www.kemet.com) may be used.
In applications where a high output surge current can be expect-
ed, use a high value but low ESR output capacitor for superior
load transient response. The ILC7082 is stable with no load.
Noise Bypass Capacitor
In low noise applications, the self noise of the ILC7082 can
be decreased further by connecting a capacitor from the
noise bypass pin (pin 4) to ground (pin 2). The noise bypass
pin is a high impedance node as such care should be taken
in printed circuit board layout to avoid noise pick-up from
external sources. Moreover, the noise bypass capacitor
should have low leakage.
Noise bypass capacitors with a value as low as 470pF may
be used. However, for optimum performance, use a 0.01mF
or larger, ceramic chip capacitor. Note that the turn on and
turn off response of the ILC7082 is inversely proportional to
the value of the noise bypass capacitor. For fast turn on and
turn off, use a small value noise bypass capacitor. In appli-
cations were exceptionally low output noise is not required,
consider omitting the noise bypass capacitor altogether.
The Effects of ESR (Equivalent Series Resistance)
The ESR of a capacitor is a measure of the resistance due
to the leads and the internal connections of the component.
Typically measured in m
Ω (milli-ohms) it can increase to
ohms in some cases.
Wherever there is a combination of resistance and current,
voltages will be present. The control functions of LDOs use
two voltages in order to maintain the output precisely; V
OUT
and V
REF.
With reference to the block diagram in figure 4, V
OUT is fed
back to the error amplifier and is used as the supply voltage
for the internal components of the ILC7082. So any change
in V
OUT will cause the error amplifier to try to compensate to
maintain V
OUT
at the set level and noise on V
OUT
will be
reflected into the supply of each internal components of the
ILC7082. So any change in V
OUT will cause the error ampli-
fier to try to compensate to maintain V
OUT at the set level and
noise on V
OUT will be reflected into the supply of each inter-
nal circuit. The reference voltage, V
REF, is influenced by the
C
NOISE pin. Noise into this pin will add to the reference volt-
age and be fed through the circuit. These factors will not
cause a problem if some simple steps are taken. Figure 5
shows where these added ESR resistances are present in
the typical LDO circuit.
With this in mind low ESR components will offer better per-
formance where the LDO may be subjected to large load
transients current. ESR is less of a problem with C
IN as the
voltage fluctuations at the input will be filtered by the LDO.
ILC7082
V
IN
SOT-23-5
C
IN
ON
OFF
12
3
4
5
C
NOISE
RF LDOTM
Regulator
R*
R*
R
C
V
OUT
C
OUT
I
C
I
OUT
Figure 5: ESR present in COUT and CNOISE


Ähnliche Teilenummer - ILC7082

HerstellerTeilenummerDatenblattBauteilbeschribung
logo
Fairchild Semiconductor
ILC7082 FAIRCHILD-ILC7082 Datasheet
205Kb / 16P
   150mA SOT-23 Low Noise CMOS RF-LDOTM Regulator
ILC7082-XX FAIRCHILD-ILC7082-XX Datasheet
205Kb / 16P
   150mA SOT-23 Low Noise CMOS RF-LDOTM Regulator
ILC7082ADJ FAIRCHILD-ILC7082ADJ Datasheet
205Kb / 16P
   150mA SOT-23 Low Noise CMOS RF-LDOTM Regulator
ILC7082AIM5-30 FAIRCHILD-ILC7082AIM5-30 Datasheet
205Kb / 16P
   150mA SOT-23 Low Noise CMOS RF-LDOTM Regulator
ILC7082AIM525X FAIRCHILD-ILC7082AIM525X Datasheet
205Kb / 16P
   150mA SOT-23 Low Noise CMOS RF-LDOTM Regulator
More results

Ähnliche Beschreibung - ILC7082

HerstellerTeilenummerDatenblattBauteilbeschribung
logo
Fairchild Semiconductor
ILC7083 FAIRCHILD-ILC7083 Datasheet
472Kb / 16P
   150mA SOT-23 Low Noise CMOS RF-LDO??Regulator
ILC7082 FAIRCHILD-ILC7082 Datasheet
205Kb / 16P
   150mA SOT-23 Low Noise CMOS RF-LDOTM Regulator
logo
Impala Linear Corporati...
ILC7071 IMPALA-ILC7071 Datasheet
40Kb / 4P
   100MA SOT-23-5 ULTRA LOW NOISE CMOS RF-LDO REGULATOR
logo
Fairchild Semiconductor
ILC7071 FAIRCHILD-ILC7071 Datasheet
110Kb / 11P
   100mA SOT-23-5 Low Noise CMOS RF-LDO Regulator
logo
SHENZHEN FUMAN ELECTRON...
SC9193 FUMAN-SC9193 Datasheet
534Kb / 11P
   150mA, Ultra-Low Noise, Ultra-Fast CMOS LDO Regulator
logo
Seaward Electronics Inc...
SE5508 SEAWARD-SE5508 Datasheet
181Kb / 7P
   150mA CMOS Low Noise LDO Voltage Regulator
logo
Unisonic Technologies
LR1102 UTC-LR1102 Datasheet
188Kb / 12P
   LOW NOISE 150mA LDO REGULATOR
logo
Gamma Microelectronics ...
GM6155 GAMMA-GM6155 Datasheet
245Kb / 9P
   150mA LOW-NOISE LDO REGULATOR
logo
RICOH electronics devic...
R1112N RICOH-R1112N_02 Datasheet
231Kb / 21P
   LOW NOISE 150mA LDO REGULATOR
R1114N151A RICOH-R1114N151A Datasheet
525Kb / 31P
   LOW NOISE 150mA LDO REGULATOR
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16


Datenblatt Download

Go To PDF Page


Link URL




Privatsphäre und Datenschutz
ALLDATASHEETDE.COM
War ALLDATASHEET hilfreich?  [ DONATE ] 

Über Alldatasheet   |   Werbung   |   Kontakt   |   Privatsphäre und Datenschutz   |   Linktausch   |   Hersteller
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com