參數(shù)資料
型號(hào)： LTC3833IUDC#PBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, 2000 kHz SWITCHING FREQ-MAX, PQCC20
封裝： 3 X 3 MM, LEAD FREE, PLASTIC, QFN-20
文件頁(yè)數(shù)： 10/36頁(yè)
文件大?。?/td> 513K
代理商： LTC3833IUDC#PBF
LTC3833
18
3833f
APPLICATIONS INFORMATION
do not offer much relief. Note that capacitor manufactur-
ers’ ripple current ratings for electrolytic and conductive
polymer capacitors are often based on only 2000 hours of
life. This makes it advisable to further derate the capacitor
or to choose a capacitor rated at a higher temperature
than required.
The selection of COUT is primarily determined by the effec-
tive series resistance, ESR, to minimize voltage ripple. The
outputripple,
VOUT,incontinuousmodeisdeterminedby:
VOUT ≤ IL RESR +
1
8 f COUT
The output ripple is highest at maximum input voltage
since
IL increases with input voltage. Typically, once the
ESR requirement for COUT has been met, the RMS current
ratinggenerallyfarexceedsthepeak-to-peakcurrentripple
requirement. The choice of using smaller output capaci-
tance increases the ripple voltage due to the discharging
term but can be compensated for by using capacitors of
very low ESR to maintain the ripple voltage.
Multiple capacitors placed in parallel may be needed to
meet the ESR and RMS current handling requirements.
Dry tantalum, special polymer, aluminum electrolytic and
ceramic capacitors are all available in surface mount pack-
ages. Special polymer capacitors offer very low ESR but
have lower capacitance density than other types. Tantalum
capacitors have the highest capacitance density but it is
important to only use types that have been surge tested
foruseinswitchingpowersupplies.Aluminumelectrolytic
capacitors have significantly higher ESR, but can be used
in cost-sensitive applications provided that consideration
is given to ripple current ratings and long-term reliability.
Ceramic capacitors have excellent low ESR characteris-
tics but can have a high voltage coefficient and audible
piezoelectriceffects.ThehighQofceramiccapacitorswith
trace inductance can also lead to significant ringing. When
used as input capacitors, care must be taken to ensure
that ringing from inrush currents and switching does not
pose an overvoltage hazard to the power switches and
controller.
Forhighswitchingfrequencies,reducingoutputrippleand
betterEMIfilteringmayrequiresmall-valuecapacitorsthat
have low ESL (and correspondingly higher self resonant
frequencies) to be placed in parallel with larger value
capacitors that have higher ESL. This will ensure good
noise and EMI filtering in the entire frequency spectrum
of interest. Even though ceramic capacitors generally
have good high frequency performance, small ceramic
capacitors may still have to be parallel connected with
large ones to optimize performance.
Top MOSFET Driver Supply (CB, DB)
Anexternalbootstrapcapacitor,CB,connectedtotheBOOST
pin supplies the gate drive voltage for the topside MOSFET.
This capacitor is charged through diode DB from INTVCC
when the switch node is low. When the top MOSFET turns
on, the switch node rises to VIN and the BOOST pin rises to
approximately VIN + INTVCC. The boost capacitor needs to
store approximately 100 times the gate charge required by
thetopMOSFET.Inmostapplicationsa0.1μFto0.47μF,X5R
or X7R dielectric capacitor is adequate. It is recommended
that the BOOST capacitor be no larger than 10% of the
INTVCC capacitor, CVCC, to ensure that the CVCC can supply
theupperMOSFETgatechargeandBOOSTcapacitorunder
all operating conditions. Variable frequency in response
to load steps offers superior transient performance but
requires higher instantaneous gate drive. Gate charge
demands are greatest in high frequency low duty factor
applications under high dI/dt load steps and at start-up.
In order to minimize SW node ringing and EMI, connect a
5Ω to 10Ω resistor in series with the BOOST pin. Make the
CBandDBconnectionsontheothersideoftheresistor.This
seriesresistorhelpstoslowdowntheTGrisetime,limiting
the high dI/dt current through the top MOSFET that causes
SW node ringing.
INTVCC Regulator and EXTVCC Power
The LTC3833 features a PMOS low dropout linear regu-
lator (LDO) that supplies power to INTVCC from the VIN
supply. INTVCC powers the gate drivers and much of the
LTC3833’sinternalcircuitry.TheLDOregulatesthevoltage
at the INTVCC pin to 5.3V.
The LDO can supply a maximum current of 50mARMS and
must be bypassed to ground with a minimum of 4.7μF
ceramic capacitor. Good bypassing is needed to supply
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