LM3508TLEV National Semiconductor, LM3508TLEV Datasheet - Page 12

• Manufacturer Part Number: LM3508TLEV
• Description: BOARD EVALUATION FOR LM3508TL
• Manufacturer: National Semiconductor
• Series: PowerWise®r

Specifications of LM3508TLEV

• Current - Output / Channel: 20mA
• Outputs And Type: 1, Non-Isolated
• Voltage - Output: 17V
• Features: Dimmable
• Voltage - Input: 2.7 ~ 5.5V
• Utilized Ic / Part: LM3508
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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Table 2. Recommended Inductor Manufacturers
Layout Considerations
Proper layout is essential for stable, jitter free operation, and
good efficiency. Follow these steps to ensure a good layout.
Manufacture
Toko
TDK
TDK
r
22µ
22µ
22u
H
H
H
L
D3313FB
AT-220M
AT-220M
(1036FB-
VLF3010
VLF3012
Number
220M)
Part
R33
R33
2.6mm×2.
2.6mm×2.
3.3mm×3.
8mm×1m
8mm×1.2
3mm×1.3
Size
mm
mm
m
Saturation
Current
330mA
330mA
350mA
12
1, Use a separate ground plane for power ground (PGND)
and analog ground (AGND).
2, Keep high current paths such as SW and PGND connec-
tions short.
3, Connect the return terminals for the input capacitor and the
output capacitor together at a single point as close as possible
to PGND.
4, Connect PGND and AGND together as close as possible
to the IC. Do not connect them together anywhere else.
5, Connect the input capacitor (C
IN.
6, Connect the output capacitor (C
to OUT.
7, Connect the positive terminal of R
to ILED and the negative terminal as close as possible to
PGND. This ensures accurate current programming.
IN
OUT
) as close as possible to
SET
) as close as possible
as close as possible