LM3528TMX National Semiconductor, LM3528TMX Datasheet - Page 27

• Manufacturer Part Number: LM3528TMX
• Description: LM3528 High Efficiency, Multi Display LED Driver with 128 Exponential Dimming Steps and Integrated OLED Power Supply in a 1.2mm - 1.6mm uSMD Package; Package: MICRO SMD; No of Pins: 12; Qty per Container: 3000; Container: Reel
• Manufacturer: National Semiconductor

TABLE 7. Recommended Output Capacitors
INDUCTOR SELECTION
The LM3528 is designed for use with a 10µH inductor, how-
ever 22µH are suitable providing the output capacitor is in-
creased 2×. When selecting the inductor ensure that the
saturation current rating (I
enough and the inductor is large enough such that at the
maximum LED current the peak inductor current is less than
the LM3528’s peak switch current limit. This is done by choos-
ing:
TABLE 8. Recommended Inductors
DIODE SELECTION
The output diode must have a reverse breakdown voltage
greater than the maximum output voltage. The diodes aver-
age current rating should be high enough to handle the
LM3528’s output current. Additionally, the diodes peak cur-
rent rating must be high enough to handle the peak inductor
current. Schottky diodes are recommended due to their lower
Manufactur
Coilcraft
Coilcraft
TOKO
Manufacturer
TDK
TDK
er
Murata
Murata
TDK
TDK
VLF3012AT-100MR49
VLF4012AT-100MR79
LPS3008-103ML
LPS4012-103ML
A997AS-100M
Part Number
GRM39X5R105K25D539
GRM219R61E225KA12
SAT
C1608X5R1E105M
C2012X5R1E225M
) for the chosen inductor is high
Part Number
Value
10µH
10µH
10µH
10µH
10µH
2.95mm×2.95mm×0.8mm
3.5mm×3.7mm×1.2mm
3.9mm×3.9mm×1.1mm
3.8mm×3.8mm×1.8mm
2.6mm×2.8mm×1mm
Value
2.2µF
2.2µF
1µF
1µF
27
Dimensions
Values for I
vs. V
Table 8 shows possible inductors, as well as their corre-
sponding case size and their saturation current ratings.
forward voltage drop (0.3V to 0.5V) compared to (0.6V to
0.8V) for PN junction diodes. If a PN junction diode is used,
ensure it is the ultra-fast type (trr < 50ns) to prevent excessive
loss in the rectifier. For Schottky diodes the B05030WS (or
equivalent) work well for most designs. See Table 9 for a list
of other Schottky Diodes with similar performance.
IN
in the Typical Performance Characteristics graphs.
PEAK
Case Size
can be found in the plot of peak current limit
0603
0603
0805
0805
490mA
490mA
800mA
700mA
580mA
I
SAT
Voltage Rating
DC Resistance
0.36Ω
0.65Ω
0.35Ω
0.18Ω
0.3Ω
25V
25V
25V
25V
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