DC367A - Demo Manual

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sffiw
DEMCMANUALDC367
LOWDROPOUT
REGULATOR
LTt963 L5A
LowNoiseLDORegulotor
DCSCRIPTION
Demonstration
circuitDC3O7
isa lownoisemicropowerRFpower
supplies
and,inlarger
systems,
aslocalregulavoltage
regulator
[email protected]
in theg-leadS0 tors.Theability
totolerate
awidevariety
ofoutput
capacipackage.
Circuits
designed
withtheLT1963
areused torsmakes
the1T1963
idealinspaceand
cost-sensitive
primarily
phones,
incellular
voltage
controlled
oscillators, systems.
,g,LTC ardLTareregistered
trademarks
of Line.r'
t.rnnotogyToiiiEiiii.
PCRFORMRNCC
SUMMRRY
TA= 25oC,
Vlx= 2.5V,VSffiT
= 5V,l1s4p
= 1mA,Vgul= 1.21V
(JPZ
setonPins1-2),unless
othenrvise
specified.
PARAMETER
CONDITIONS
Inputvoltage
Hange
MIN
2.5
UutputV0ltage
uurpuvotrage
(N0te
1
t,tJl
= 2.5V,JP2onPins3-4
Vrru
Vlru= 2.8V,JP2onPins5-6
= 3.5V,JP2onPins7-8
Vrru
= 4.3V,JP2onPins9-10
Vrru
AVlx= l.$V{s!6Y
uurput
vottage
(Note
1)
(Note
0utputVoltage
1)
uurpur
vorrage
(Note
1
Line
Begulation
0uiescent
Current
0utputVoltage
Noise
UNITS
vV
20
1.210 1.228
I
Als61s= 1mAto 1.5A
0n-to-Otf
0tf-to-0n,lroRo= 1mA
lLolo= 1.5A,BW= 1OHz
to 100kHz
MAX
L46S 1.500 I . C J J
'1.759
1,803 t . u c b
2.417 2.491 2.585
3 . 1 7 1 3.280 3.420
210
Alss4g= Q6[
L0a0
Heguhtt0n
SHDN
PinThreshold
TYP
0.45
I
\/
t
mV
mA
t.c
0.2
0.65
1
0.85
40
t.o
Nole1:0utput
voltage
variations
include
11%tolerance
offeedback
divider
network.
Fortighter
voltage
range,
uselower
tolerance
resistors
o;;
voltage
0utput
devices.
ol
V
PVnn,ts
t*
TYPICRT
PCRFORMRNCC
CHRRRCT€RISTICS
RNDBORRDPHOTO
Typical
Dropout
Voltage
1T1963
(3.3VOutput)
1(lHzto 100kHz
0utputNoise
500
450
400
e
I
T,r= 12i
vvv
u
O
photo)
Gomponent
Side(Board
I
"-z
ZJU
5 zoo
3 rso
I
E
o
1oo
50 f//
0
0
uouT= l uFr
l l s a e= 1 . 5 A
0.2 0.4 0.6 0.8 1.0 1.2 1 . 4 1 . 6
0UTPUT
(A)
CURRENT
0s7. Gol
lTl,u]s*
-1
l
DEMOMANUALDC367
LOWDROPOUT
REGULATOR
PRCI{RG€
RNDSCH€MRTIC
DIRGRRM5
LT1
963ES8
TOPVIEW
OUT
ADJ
GND
NC
58PACKAGE
8.LEAD
PLASTIC
SO
EJ
OUT
IN
LTl 963
OUT
GND
ADJ
GND
GND
SFDN
BYP
T
10pF
1n\/
3 2 1 6I
=
E4
GND
Figure
1.1T1963
f Sn fo, Noise
Micropower
LDO
Regulator
PRNTS
IIST
BEFERENCE
DESIGNATOR
OUANTTTY
PART
NUMBER
ADJl
n
0402
06032c
105ZAT1
A
c2
1
El to E4
t
JP1
1
JP2
Shunts
forJpl
Shunts
forJp2
R1
nl
R3
R4
R5
U1
2
tAJAt06M010R
2308-2
2802S-02-G.1
6351-12P1
cctJ2MM-138G
CTAIJlMM.G
cR05-9760FM
cR05-2001
FM
cR05-4321
FM
cR0s-698.1FM
cR0s-41
21FM
LT.I963ES8
DESCRIPTION
upu0nal
lpf 10VYsV80%Caoacitor
1fuF10VTantalum
Capacrtor
t-fln u.U64"
HoleTerminal
Turret
2-Pin
I RowO.Ozg
cclumoeiuonnector,
SMT2X6,
0.39"
Gap
snunt
0.079"
Center
ununts
0.39cc
976lnOW
1%Chipnesistoi-2k1/16W
1%Chip
nesistoi4.32k
1/16W
1%Chip
R;Jsro,
6.98k
1/16W
1%Chip
Re;sto,
4.12k
1116W
t,t"Cfrip
nesistol-
ffi
VENDOR
AVX
AVX
Milt-Max
Comm-Con
Comm-Con
Comm-Con
Comm-Con
MC
MC
MC
AAC
AAC
LTC
TETEPHONE
(843)e46-0362
(843)946-0362
(516)
e22-6000
(626)
301.4200
(626)301-4200
(626)301-4200
(626)
30'1-4200
(800)s08-152.1
(800)
508-1521
(800)
508-1521
(800)508-.1521
(714)
255-e186
(408)
432-1900
DEMCMANUALDC367
LOWDROPOUT
REGULATOR
OP€RRilON
HO()K.UP
Solidturretterminals
areprovided
foreasyconnection
to stability,
mostnotably
withsmallcapacitors.
A 1OpF
supplies
andtestequipment.
Connect
a0Vto 20V,1.64 minimum
output
value
withESR
of3e orlessisrecompowersupply
across
thelNandGNDterminals
andthe mended
to prevent
oscillation.
Transient
response
isa
loadacross
the0UTand
GND
terminals.
pincan function
TheS-FDN
of outputcapacitance.
Larger
values
of output
bedisconnected
fromlNviaJPlto allow
forseparatecapacitance
peak
decrease
provid
deviations,
ingimproved
shutdown
viaasecondary
control
control
line.Jp2canbe transient
resp0nse
forlargeloadcurrent
changes.
Bypass
usedto select
anyofa number
ofcommon
fixedoutput capacitors,
used
todecouple
powindividual
components
voltages,
orused
inconjunction
withADJlto create
a eredbytheregulator,
increase
theeffective
output
capacicustom
voltage
output
using
theformula:
torvalue.
- 1.21V)l29TvA
ADJ]= (Vour
Ceramic
Gapacitors
Thermal
Characleristics
Ceramic
capacitors
require
extraconsideration.
They
are
manufactured
with
variety
a
of dielectrics,
eachwith
Demonstration
CircuitDC367
hasbeenlaidoutto illusdifferent
behavior
across
temperature
and
applied
power
trateandachieve
maximum
handling
capabilities.
ybv,
voltage.
The
most
common
dielectrics
areZ5U, XbR
Although
two-layer
asimple
suffibo4d$ighthave
been
and
X7R.
The
ZSU
and
prbvide
YSV
dietectrics
high
cientforelectrical
operation
oftheLT1g63,
thefour-layer
package,
capacitance
in
a
small
butexhibit
strong
voltage
ground
planes
board
withviasto internal
offersexcellent
and
temperature
coefficients,
as
shown
in
Figures
B'1and
thermalcharacteristics.
Atwo-layer
board
ofthesame
size
ySV
82.
Used
witha 5Vregulator,
a 1OpF capacitor
withnothermal
viaswillexhibit
athermal
resistance
of
shows
values
as
low
as
1pF
to
2prF
overtheoperating
60'C/1/V,
whereas
0C367
exhibits
athermal
resistance
of
temperature
range.
TheX5RandX7Rdielectrics
have
50"CA/V,
morestable
characteristics
andarem0resuitable
for
outputcapacitor
use.TheX7Rtypehasbetterstability
OUTPUT
CAPACIT()R
SELECTI()N
over
temperature,
while
theX5Ris lessexpensive
and
Theoutputcapacitor
C3is a 1OprF
tantalum
capacitor. available
inhigher
values.
Should
adifferent
outputcapacitor
bedesired,
caremust
andtemperature
coefficients
arenottheonly
beexercised
withtheselection.
Manyceramic
capacitor Voltage
problem
sources.
Some
ceramic
capacitors
have
d i e l e c t r i cesx h i b i ts t r o n gt e m p e r a t u a
apiezor en d
resp0nse.
Apiezoelectric
generates
device
voltage
characteristics
voltage
thatreduce
theireffective
capaci- electric
across
its
terminals
due
to
mechanical
tanceto aslowas10%to 20%of nominal
stress,
similar
to
overthefull
piezoelectric
the
way
a
accelerometer
temperature
range.
microphone
Forfurtherinformation,
or
seeLinear
Foraceramic
capacitor,
thestress
Technology
Application
canbeinduced
Note83,"Performance
Verifica- works.
vibrations
by
in
the
system
or
thermal
tionofLowNoise,
transients.
LowDropout
The
Regulators,"
Appendix
B,
resulting
voltages
"Capacitor
can
cause
appreciable
Selection
amounts
ofnoise,
Considerations,"
rep
rinted
below.
especially
when
a ceramic
capacitor
is used
fornojse
CAPACIT()R
SELECTI()N
bypassing.
A ceramic
C()NSIDERATI()NS
produced
capacitor
Figure
B3's
tracein resp0nse
to lighttapping
froma pencil.
Similar
Output
Gapacitance
andTransienl
Response
vibration-induced
behavior
canmasquerade
asincreased
output
voltage
noise.
Theregulators
aredesigned
to bestable
witha wide
range
ofoutput
capacitors.
0utputcapacitor
ESR
affects
-,(TfJIlmR
3
DEMOMANUALDC367
LOWDROPOUT
REGULATOR
OPCRRilON
V()LTAGE
OUTPUT
N(}ISE
Measuring
voltage
output
noisecanbeatrickyprocess, enormous
amount
oftimeto provide
accurate,
relevant
further
complicated
bythelowlevels
ofnoise
inherent
in datatocustomers
regarding
noiseperformance.
Forfura circuit
suchasthis.Consideration
mustbegiven
to therinformation
onmeasuring
output
voltage
noise,
see
regulator
operating
conditions,
aswellasthenoise
band- LinearTechnology
Application
Note83,"Performance
widthof interest.
Linear
Technology
hasinvested
an Verification
ofLowNoise,
LowDropout
Regulators."
BOTH
CAPACITORS
ARE16V,
1210CASE
SIZE,
10r.tF
n
s
u
x5t
-av
\
= -{u
;
z
< -An
=--
Y5V
-6U
-luu
-
0
2
4
6 8 101214
(V)
DCBIASVOLTAGE
0w
8r
Figure
B1.Ceramic
Capacitor
DCBiasChpracteristics
Indicate
Pronounced
Voltage
Dependencd.
Device
Must
Ptovide
Desired
Capacitance
Valueat0perating
Voltage
,X5B
;sU
;
\
d. -20
z
; -40
\
z
E -60
rttl
\
- BOTH
CAPACITORS
ARE16V,
1210
CASE
SIZE,,lOrF
,
-100
-qn
-tq
0
25 50 75
TEMPEMTURE
("C)
100 125
0667 4
Figure
82.Ceramic
Capacitor
Temperture
Characteristics
Show
Large
Capacitance
Shift.Eftect
Should
Be
Considered
When
Determining
Circuit
EnorBudget
Figure
83.A Ceramic
Capacitor
Responds
to Lightpencil
g0pVp-p
Tapping.
Piezoelectric
Based
Response
Approaches
DEMOMANUALDC367
LOWDROPOUT
REGULATOR
OP€RRilON
Noise
Testing
Consideralions
Whatnoise
isofinterest
bandwidth
andwhyisit interest- a60dBgainstage
witha5Hzhighpass
input.A3provides
ing?Inmostsystems,
therange
of1OHz
to100kHz
isthe a 10H2,
2ndorderButtenruorth
highpass
characteristic.
information
signalprocessing
areaofc0ncern.
Addition- [email protected]
filterblockis arranged
asa 4th order
produce
ally,linearregulators
littlenoiseenergy
outside Butteruvorth
lowpass.
lts output
is delivered
viathe
thisregion.l
These
considerations
suggest
a measure-330FF-1
00fihighpass
network.
Thecircuit's
outputdrives
mentbandpass
of10Hzto
100kHz,
withsteep
slopes
atthe a thermally
responding
RMSvoltmeter.3
Notethatall
bandlimits.Figure
2 showsa conceptual
filterfor LDO circuitpower
isfurnished
precluding
ground
bybatteries,
noisetesting.
TheButtenrvorth
sections
arethekeyto loops
fromcorrupting
themeasurement.
steep
slopes
andflatness
inthepassband.
Thesmallinput Nole1: Switching
regulators
areanentirely
proposition,
ditferent
gaintoprovide
levelrequires
60dBoflownoise
adequate requiring
verybroadband
noisemeasurement.
fortheButtenruorth
signal
filters.Figure
choice
fortheregulator,
3details
thefilter l,lote2: Component
morecritical
thanmight
be
supposed,
is
discussed
"Capacitor
in
Selection
Considerations."
Theregulator
scheme.
under
testis at thediagram's
3: Thechoice
oftheRMSvoltmeter
isabsolutely
crucial
to
gainhighpass
center.2
A1-A3make
upa60dB
section.
A1 Note
obtaining
meaningful
measurements.
SeeAppendix
C,Application
andA2,extremely
lownoise
(<1nvrffi1,comprise Note83"Understanding
devices
andSelecting
RMSVoltmeters."
Figute
2.FillerStructure
forNoise
Testing
LD0s.
Butterworth
Sections
Provide
Appropriate
Response
in Desired
Frequency
Range
Intormationfurnishedby LinearTechnology
corporationis believedt0 be accurateand reliable.
However,
noresponsibility
is assumed
f0r its use.LinearTechnology
Corporation
makesno rcpresen-
6
_l
DEMCMANUALDC367
LOWDROPOUT
REGULATOR
OP€RRTION
1OpF
I
WPICAL
REGUI.ATOR
UNDER
TEST
.I%
ALLRESISTORS
MFrAL
FILM
4.7pFCAPACITORS
= MYLAR,
W|MAMKS-2
330pF
= SANY0
CAPACITOHS
0SC0N
T4.5V
DERIVED
FROM
6AAcELLs
POWER
REGULATOR
FROM
APPROPRIATE
NUMEER
OFDSIZE
BATTERIES
10k
LTCl562
INV8 INVC
VlB
VlC
v28 vzc
v-'
\i+
v-'
|
;
330pF I
rr
I 100f,t
OUTPUT
TOTHERMALLY
RESPONDING
RMSVOLTMEIER
0.1VFULL
= 100r.rVnus
SCALE
NO|SE
10Hz
T0100kHz
BW
;l fMr-
v-
SHDN AGNO
v-.
v-'
v2A
V20
V1A
V1D
INVA INVD
F.igure
3. lmplementation
Figure
2. LowNoise
.G
PACKAGE
PINS4, 7, 14,17ARE
SUBSTRATVSHIELD
CONNECTIONS
ANDMUST
BETIED
TOV-
provide
Amplifiers
Gainandlnitial
-0I
Highpass
shaping'
LTc1562
riitersuppiiis
+t'irru.iauftr*;;tiLilasscharacteristic
DEMOMANUALDC367
LOWDROPOUT
REGULATOR
PCBTRYOUT
RNDflTM
i.Zffi'ffi,.lfie#!-bi,ll
011
a
p3;1l.J,llfi
1..?i
:S.:H
t-_
RJFlt
Et
ffi--JPi-Rd
;t
cz uI cr
ttFln
r--.1
llUU
l_J+t
E1
GND
=EE
o
ll{
I
I-
a
o
E2
sTET
-r
r==
o
DCJ67ALT1963ES8
I.5A L()TDROPOUT
REGULAIOR
a
Silkscreen
Top
Solder
Mask
Top
Layer
1, Component
Side
Layer2, GNDPlane.
Paste
Mask
Top
Layer
3, GN[lplane.
I
o
a
a
....*.
o
Layer
4, Solder
Side*
-
o
I
aaaaaaa
a
Solder
MaskBottom
- These
layers
areshorted
toL1withviasandfunction
asheatdispersants.
{7L=|JlsnR
DEMOMANUALDC367
LOWDROPOUT
REGULATOR
PCFRBDRRUNG
l-'*-l
N0TES:
UNLESS
OTHERWISE
SPECIFIED
1.MATERIAL:
FR40RE0UIVALENT
EPOXY,
2 02.COppER
CLAD
THICKNESS
0.062r 0.006ToTAL
0F4 r-AyERS.
2.FINISH:
ALLPUTED
HOLES
0.001
MIN/0.001SMM
COppER
PLATE
ELECTRODEPOSITEO
TIME.LEAD
COMPOSITION
(SMOBC)
BEFORE
REFLOW,
SOLDER
MASK
OVER
BARE
COPPER
3.S0LDER
MASK:
BOTH
SIDES
USING
LPt0REOU|VALENT.
4.SILKSCREEN:
USING
WHITE
NON-C0NDUCT|VE
Ep0XytNK.
5. UNUSED
SMDCOMPONENTS
SHOULD
BEFREE
OFSOLDER.
6. FILLUPALLVIAS
WITH
SOLDER.
7.SCORING:
DO
.A
OC
OC
A .:
A
oc
? -B
o
2.00
oc
I
I
__l
Linear
Technology
Corporation
1630McCarthy
Blvd.,
Mitpitas,
CA95035-7417
/,ln8\ 432-1qnn . FAY' /dn8l fid-nsn7
. uamr linarr nnm
NUMBER
YMBOLDIAMEIEROFHOLES TEO
0.02
za
B
0.035
z
YES
0.064
YES
inr-0.07
z
TEDINUSA
17Lrn$P
i='Crir.ro-roor-
,='t
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