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LM3242TMX/NOPB Datasheet(PDF) 18 Page - Texas Instruments

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Part # LM3242TMX/NOPB
Description  750mA Miniature Adjustable Step-Down DC-DC Converter
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LM3242TMX/NOPB Datasheet(HTML) 18 Page - Texas Instruments

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LM3242
SNOSB48E – OCTOBER 2011 – REVISED AUGUST 2015
www.ti.com
Table 3. Suggested Inductors
MODEL
SIZE (W × L × H) (mm)
VENDOR
MIPSZ2012D0R5
2 × 1.2 × 1
FDK
LQM21PNR54MG0
2 × 1.25 × 0.9
Murata
LQM2MPNR47NG0
2 × 1.6 × 0.9
Murata
CIG21LR47M
2 × 1.25 × 1
Samsung
CKP2012NR47M
2 × 1.25 × 1
Taiyo Yuden
8.2.2.2 Capacitor Selection
The LM3242 is designed for use with ceramic capacitors for its input and output filters. Use a 10-µF ceramic
capacitor for input and a sum total of 4.7-µF ceramic capacitors for the output. They must maintain at least 50%
capacitance at DC bias and temperature conditions. Ceramic capacitors types such as X5R, X7R, and B are
recommended for both filters. These provide an optimal balance between small size, cost, reliability and
performance for cell phones and similar applications. Table 4 lists some suggested part numbers and suppliers.
DC bias characteristics of the capacitors must be considered when selecting the voltage rating and case size of
the capacitor. If it is necessary to choose a 0603 (1608) size capacitor for VIN and 0402 (1005) size capacitor for
VOUT, the operation of the LM3242 must be carefully evaluated on the system board. Use of a 2.2-µF capacitor in
conjunction with multiple 0.47 µF or 1 µF capacitors in parallel may also be considered when connecting to
power amplifier devices that require local decoupling.
Table 4. Suggested Capacitors and Their Suppliers
CAPACITANCE
MODEL
SIZE (W × L) (mm)
VENDOR
2.2 µF
GRM155R60J225M
1 × 0.5
Murata
2.2 µF
C1005X5R0J225M
1 × 0.5
TDK
2.2 µF
CL05A225MQ5NSNC
1 × 0.5
Samsung
4.7 µF
C1608JB0J475M
1.6 × 0.8
TDK
4.7 µF
C1005X5R0J475M
1 × 0.5
TDK
4.7 µF
CL05A475MQ5NRNC
1 × 0.5
Samsung
10 µF
C1608X5R0J106M
1.6 × 0.8
TDK
10 µF
GRM155R60J106M
1 × 0.5
Murata
10 µF
CL05A106MQ5NUNC
1 × 0.5
Samsung
The input filter capacitor supplies AC current drawn by the PFET switch of the LM3242 in the first part of each
cycle and reduces the voltage ripple imposed on the input power source. The output filter capacitor absorbs the
AC inductor current, helps maintain a steady output voltage during transient load changes and reduces output
voltage ripple. These capacitors must be selected with sufficient capacitance and sufficiently low Equivalent
Series Resistance (ESR) to perform these functions. The ESR of the filter capacitors is generally a major factor
in voltage ripple.
18
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Copyright © 2011–2015, Texas Instruments Incorporated
Product Folder Links: LM3242


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