參數(shù)資料
型號(hào)： LTC3536IMSE#PBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： 4 A SWITCHING REGULATOR, 1440 kHz SWITCHING FREQ-MAX, PDSO12
封裝： LEAD FREE, PLASTIC, MSOP-12
文件頁(yè)數(shù)： 16/28頁(yè)
文件大小： 1088K
代理商： LTC3536IMSE#PBF
LTC3536
23
3536f
APPLICATIONS INFORMATION
Switching Frequency Selection
Higher switching frequencies facilitate the use of smaller
inductors as well as smaller input and output filter capaci-
tors which results in a smaller solution size and reduced
componentheight.However,higherswitchingfrequencies
also generally reduce conversion efficiency due to the
increased switching losses. In addition, the maximum
voltagestep-upratioisreducedslightlyathigherswitching
frequencies as shown in the maximum duty cycle versus
switching frequency curve in the Typical Performance
Characteristics section of this data sheet.
PCB Layout Considerations
TheLTC3536buck-boostconverterswitcheslargecurrents
at high frequencies. Special attention should be paid to the
PC board layout to ensure a stable, noise-free and efficient
application circuit. A few key guidelines are provided:
1. Theparasiticinductanceandresistanceofallcirculating
high current paths should be minimized. This can be
accomplished by keeping the routes as short and as
wide as possible. Capacitor ground connections should
via down to the ground plane by way of the shortest
route possible. The bypass capacitors on PVIN and
VOUT should be placed as close to the IC as possible
and should have the shortest possible paths to ground.
2. The exposed pad is the electrical power ground connec-
tion for the LTC3536 in the DD package. Multiple vias
shouldconnectthebackpaddirectlytothegroundplane.
Inaddition,maximizationofthemetallizationconnected
to the backpad will improve the thermal environment
and improve the power handling capabilities of the IC
in either package.
3. The components their connections with high current
should all be placed over a complete ground plane to
minimize loop cross-sectional areas. This minimizes
EMI and reduces inductive drops.
4. Connections to all of the components with high current
should be made as wide as possible to reduce the series
resistance.Thiswillimproveefficiencyandmaximizethe
output current capability of the buck-boost converter
5. Topreventlargecirculatingcurrentsinthegroundplane
from disrupting operation of the LTC3536, all small-
signal grounds should return directly to GND by way
of a dedicated Kelvin route. This includes the ground
connection for the RT pin resistor and the ground con-
nection for the feedback network.
6. Keep the routes connecting to the high impedance,
noise sensitive inputs FB and RT as short as possible
to reduce noise pick-up. Example from MODE route in
case the chip is synchronized with external clock.
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