参数资料
型号: LT3507AIUHF#PBF
厂商: LINEAR TECHNOLOGY CORP
元件分类: 稳压器
英文描述: SWITCHING REGULATOR, PQCC38
封装: 5 X 7 MM, LEAD FREE, PLASTIC, QFN-38
文件页数: 14/28页
文件大小: 372K
代理商: LT3507AIUHF#PBF
LT3507A
21
3507af
Figure 12. Subtracting the Current When the Switch Is On (12a) from the Current When the Switch Is Off (12b)
Reveals the Path of the High Frequency Switching Current (12c)
APPLICATIONS INFORMATION
Figure 13. Power Path Components and Topside Layout
VIN
SW
IOUT – IIN
IIN
IOUT
IIN
GND
(12a Switch On)
VIN
VSW
C1
D1
C2
3507A F12
L1
SW
GND
(12c High Frequency Switching Loop)
VIN
SW
GND
(12b Switch Off)
IC1
THERMAL CONSIDERATIONS
The high output current capability of the LT3507A will
require careful attention to power dissipation of all the
components to insure a safe thermal design. The PCB
must provide heat sinking to keep the LT3507A cool.
The exposed pad on the bottom of the package must be
soldered to a ground plane. This ground should be tied
to other copper layers below with thermal vias; these lay-
ers will spread the heat dissipated by the LT3507A. Place
additional vias near the catch diodes. Adding more copper
to the top and bottom layers and tying this copper to the
internal planes with vias can reduce thermal resistance
further. With these steps, the thermal resistance from die
(or junction) to ambient can be reduced to
θJA = 34°C/W
or less (QFN). With 100 LFPM airflow, this resistance can
fall by another 25%. Further increases in airflow will lead
to lower thermal resistance.
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