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LTC3526LB Datasheet(PDF) 6 Page - Linear Technology

Part # LTC3526LB
Description  550mA 1MHz Synchronous Step-Up DC/DC Converters
PDF  16 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3526LB Datasheet(HTML) 6 Page - Linear Technology

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LTC3526L/LTC3526LB

3526lfc
SW(Pin1):SwitchPin.ConnectinductorbetweenSWand
VIN.KeepPCBtracelengthsasshortandwideaspossible
toreduceEMI.IftheinductorcurrentfallstozeroorSHDN
islow,aninternalanti-ringingswitchisconnectedfrom
SWtoVINtominimizeEMI.
GND(Pin2,ExposedPadPin7):SignalandPowerGround.
ProvideashortdirectPCBpathbetweenGNDandthe
(–)sideoftheinputandoutputcapacitors.
The Exposed
Pad must be soldered to the PCB ground plane.Itserves
asanadditionalgroundconnectionandasameansof
conductingheatawayfromthepackage.
VIN (Pin 3):InputSupplyPin.Connectaminimumof1µF
ceramic decoupling capacitor from this pin to ground
usingshortdirectPCBtraces.
SHDN (Pin 4):LogicControlledShutdownInput.There
isaninternal4M
Ωpull-downonthispin.
•SHDN=High:Normaloperation
•SHDN=Low:Shutdown,quiescentcurrent<1µA
FB (Pin 5):FeedbackInputtothegmErrorAmplifier.Con-
nectresistordividertaptothispin.Thetopofthedivider
connectstotheoutputcapacitor,thebottomofthedivider
connectstoGND.ReferringtotheBlockDiagram,theoutput
voltagecanbeadjustedfrom1.5Vto5.25Vby:
V
V
R
R
OUT =
+


1 195
1
2
1
.
•
VOUT(Pin6):Outputvoltagesenseanddrainoftheinternal
synchronousrectifier.PCBtracefromVOUTtotheoutput
filtercapacitor(4.7µFminimum)shouldbeasshortand
Load Step Response (from Burst
Mode Operation) (LTC3526L)
Load Step Response
(Fixed Frequency)
LOAD
CURRENT
50mA/DIV
100µs/DIV
VIN = 1.2V
VOUT = 3.3V
50mA TO 100mA STEP
COUT = 10µF
3526l G21
VOUT
100mV/DIV
AC-COUPLED
LOAD
CURRENT
50mA/DIV
50µs/DIV
VIN = 1.2V
VOUT = 3.3V
5mA TO 100mA STEP
COUT = 10µF
3526l G22
VOUT
100mV/DIV
AC-COUPLED
typicAl perForMAnce chArActeristics
pin Functions



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