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AAT1217 Datasheet(PDF) 9 Page - Advanced Analogic Technologies

Part # AAT1217
Description  600mA, 1.2MHz, Micropower Synchronous Step-Up Converter
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Manufacturer  ANALOGICTECH [Advanced Analogic Technologies]
Direct Link  http://www.analogictech.com
Logo ANALOGICTECH - Advanced Analogic Technologies

AAT1217 Datasheet(HTML) 9 Page - Advanced Analogic Technologies

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IPEAK Peak Inductor Current
IDC DC Component (Average) of the Inductor
Current
∆IL Peak-Peak Inductor Ripple Current
IOUT Output (Load) Current
VOUT Output Voltage
VIN Input Voltage
η AAT1217 Efficiency (consult the perform-
ance graphs in the “Typical Characteristics”
section of the data sheet)
D Steady-State Duty Cycle
FSW Switching Frequency
L Inductor Value
For a given chosen inductor value and application
conditionsmakesurethepeakinductorcurrentdoes
notexceedthemaximumcurrentratingoftheselect-
edvendor’sinductor. Foroptimumloadtransientand
efficiency, low DCR inductors should be selected.
Table 2 lists some typical surface mount inductors
that aresuitable fortypicalAAT1217applications.
Input Capacitor
A surface mount 4.7µF or greater, X5R or X7R,
ceramiccapacitorissuggestedfortheinputcapac-
itor. The input capacitor provides a low impedance
loop for the edges of pulsed current drawn by the
AAT1217. Low ESR/ESL X7R and X5R ceramic
capacitors are ideal for this function. To minimize
stray inductance, the capacitor should be placed
as close as possible to the IC. This keeps the high
frequency content of the input current localized,
minimizing EMI and input voltage ripple. Always
examine the ceramic capacitor DC voltage coeffi-
cient characteristics to get the proper value. For
example, the capacitance of a 10µF, 6.3V, X5R
ceramic capacitor with 5.0V DC applied is actually
about 6µF.
Alaboratorytestset-uptypicallyconsistsoftwolong
wires running from the bench power supply to the
evaluation board input voltage pins.The inductance
ofthesewires,alongwiththelow-ESRceramicinput
capacitor, can create a high Q network that may
affect converter performance. This problem often
becomes apparent in the form of excessive ringing
in the output voltage during load transients which
can produce errors in loop phase and gain meas-
urements. Since the inductance of a short printed
circuitboard(PCB)tracefeedingtheinputvoltageis
significantly lower than the power leads from the
benchpowersupply,mostactualapplicationsdonot
exhibitthisproblem. Inapplicationswheretheinput
powersourceleadinductancecannotbereducedto
a level that does not affect the converter perform-
ance, a high ESR tantalum or aluminum electrolytic
capacitor should be placed in parallel with the low
ESR,ESLbypassinputceramiccapacitor.Theintro-
ductionofthehighESRcapacitordampensthehigh
Q network and stabilizes theAAT1217.
I
PEAK
=
+
I
OUT
· V
OUT
η · V
IN
V
IN
· (V
OUT
- V
IN
)
2L · F
SW
· V
OUT
IL =
; D =
=
VIN · (VOUT - VIN)
L · FSW · VOUT
VIN · D
L · FSW
VOUT - VIN
VOUT
IL
I
DC
=
I
OUT
· V
OUT
η · V
IN
I
PEAK
= I
DC
+
∆I
L
2
AAT1217
600mA, 1.2MHz, Micropower
Synchronous Step-Up Converter
1217.2007.07.1.0
9


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