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RT9722 датащи(PDF) 11 Page - Richtek Technology Corporation

номер детали RT9722
подробное описание детали  145m廓, 1.5A Power Switch with Programmable Current Limit
PDF  14 Pages
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производитель  RICHTEK [Richtek Technology Corporation]
домашняя страница  http://www.richtek.com
Logo RICHTEK - Richtek Technology Corporation

RT9722 датащи(HTML) 11 Page - Richtek Technology Corporation

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RT9722
11
DS9722-00 August 2011
www.richtek.com
Figure 4. RT9722 Maximum Power Dissipation Derating
Curve
0.00
0.10
0.20
0.30
0.40
0.50
0.60
0.70
025
50
75
100
125
Ambient Temperature (°C)
WDFN-6L 2x2
SOT-23-5/SOT-23-6
Single Layer PCB
Layout Consideration
For the best performance of the RT9722, careful PCB
layout is necessary. The following guidelines must be
considered:
Keep all input and output traces as short and wide as
possible.
Locate the bypass capacitors as close as possible to
the input and output pin of the RT9722.
Avoid vias as much as possible. If vias are necessary,
make them as large as feasible.
Place a ground plane under all circuitry to lower both
resistance and inductance and improve DC and transient
performance (Use a separate ground and power plane if
possible).
Figure 5. PCB Layout Guide
PD(MAX) = (125
°C − 25°C) / (165°C/W) = 0.606W for
WDFN-6L 2x2 package
The maximum power dissipation depends on operating
ambient temperature for fixed TJ(MAX) and thermal
resistance
θJA. For the RT9722 Figure 4 shows the
maximum power dissipation allowed under various ambient
temperatures.
VOUT GND SET
VIN
4
23
5
6
EN/EN
FLG
Rpull-up
CIN
COUT RSET
The input and output
capacitors should be
placed as close as
possible to the IC.
The main current
trace should be
as possible as
short and wide.



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