LM3207TL-2.53EV National Semiconductor, LM3207TL-2.53EV Datasheet - Page 20

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LM3207TL-2.53EV

Manufacturer Part Number
LM3207TL-2.53EV
Description
BOARD EVAL LM3207 WCDMA/CDMA
Manufacturer
National Semiconductor
Series
PowerWise®r
Datasheets

Specifications of LM3207TL-2.53EV

Main Purpose
DC/DC, Step Down with LDO
Outputs And Type
1, Non-Isolated
Voltage - Output
0.8 ~ 3.6V, 2.53V
Current - Output
650mA, 10mA
Voltage - Input
2.7 ~ 5.5V
Regulator Topology
Buck
Frequency - Switching
2MHz
Board Type
Fully Populated
Utilized Ic / Part
LM3207
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Power - Output
-
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plastic encapsulation characteristic of larger devices, it is vul-
nerable to light. Backside metalization and/or epoxy coating,
along with front-side shading by the printed circuit board, re-
duce this sensitivity. However, the package has exposed die
BOARD LAYOUT CONSIDERATIONS
Referring to Figure 4, the LM3207 has two major current loops
where pulse and ripple current flow. The loop shown in the
left hand side is most important, because pulse current shown
in Figure 4 flows in this path. The right hand side is next. The
current waveform in this path is triangular, as shown in Figure
4. Pulse current has many high-frequency components due
to fast di/dt. Triangular ripple current also has wide high-fre-
FIGURE 4. Current Loop
20
edges. Micro SMD devices are sensitive to light, in the red
and infrared range, shining on the package’s exposed die
edges.
quency components. Board layout and circuit pattern design
of these two loops are the key factors for reducing noise ra-
diation and stable operation. Other lines, such as from battery
to C1(+) and C2(+) to load, are almost DC current, so it is not
necessary to take so much care. Only pattern width (current
capability) and DCR drop considerations are needed.
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