參數(shù)資料
型號(hào)： LT3686AHMSE#PBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： 2.65 A SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO12
封裝： LEAD FREE, PLASTIC, MSOP-12
文件頁數(shù)： 16/30頁
文件大?。?/td> 504K
代理商： LT3686AHMSE#PBF
LT3686A
23
3686afa
Figure 17. PCB Layout
PCB Layout
ForproperoperationandminimumEMI,caremustbetaken
during printed circuit board layout. Figure 17 shows the
recommended component placement with trace, ground
plane and via locations. Note that large, switched currents
flow in the LT3686A’s VIN and SW pins, the catch diode
(D1) and the input capacitor (C2). The loop formed by
these components should be as small as possible and tied
to system ground in only one place. These components,
along with the inductor and output capacitor, should be
placed on the same side of the circuit board, and their
connections should be made on that layer. Place a local,
unbroken ground plane below these components, and tie
this ground plane to system ground at one location, ideally
at the ground terminal of the output capacitor C1. The SW
and BOOST nodes should be as small as possible. Finally,
keep the FB node small so that the ground pin and ground
traceswillshielditfromtheSWandBOOSTnodes.Include
vias near the exposed GND pad of the LT3686A to help
remove heat from the LT3686A to the ground plane.
High Temperature Considerations
The die temperature of the LT3686A must be lower than
the maximum rating of 125°C (150°C for LT3686AH). For
high ambient temperatures, care should be taken in the
layout of the circuit to ensure good heat sinking of the
LT3686A. The maximum load current should be derated
as the ambient temperature approaches the maximum
allowed junction temperature. The die temperature is
calculated by multiplying the LT3686A power dissipa-
tion by the thermal resistance from junction to ambient.
Power dissipation within the LT3686A can be estimated
by calculating the total power loss from an efficiency
measurement and subtracting the catch diode loss. The
resultingtemperatureriseatfullloadisnearlyindependent
ofinputvoltage.Thermalresistancedependsonthelayout
of the circuit board, but 43°C/W is typical for the (3mm
× 3mm) DFN package.
ApplicAtions inForMAtion
3686A F17
RT
UVLO
DA
BST
BD
OUT
SW
D1
VIN
SYNC/
MODE
SS
FB
C2
C1
相關(guān)PDF資料
PDF描述
LT3686AIMSE#TRPBF 2.65 A SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO12
LT3686AIDD#PBF 2.65 A SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO10
LT3686AIDD#TRPBF 2.65 A SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO10
LT3686EDD#PBF 2.65 A SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO10
LT3686IDD#TRPBF 2.65 A SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO10
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LT3686EDD 制造商:LINER 制造商全稱:Linear Technology 功能描述:37V/1.2A Step-Down Regulator in 3mm × 3mm DFN
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