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NCP1521 Datasheet(PDF) 11 Page - ON Semiconductor

Part No. NCP1521
Description  1.5 MHz, 600 mA, High−Efficiency, Low Quiescent Current, Adjustable Output Voltage Step−Down Converter
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

NCP1521 Datasheet(HTML) 11 Page - ON Semiconductor

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NCP1521
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Table 3. List of Inductor
FDK
MIPW3226 Series
TDK
VLF3010AT Series
Taiyo Yuden
LQ CBL2012
Coil craft
DO1605−T Series
LPO3010
Output Capacitor Selection
Selecting the proper output capacitor is based on the
desired output ripple voltage. Ceramic capacitors with low
ESR values will have the lowest output ripple voltage and
are strongly recommended. The output capacitor requires
either an X7R or X5R dielectric.
The output ripple voltage in PWM mode is given by:
DVOUT + DIL
1
4
fSW−3
COUT
) ESR (eq. 6)
In PFM mode (at light load), the output voltage is
regulated by pulse frequency modulation. The output
voltage ripple is independent of the output capacitor value.
It is set by the threshold of PFM comparator.
Table 4. List of Output Capacitor
Murata
GRM188R60J475KE
4.7
mF
GRM21BR60J106ME19L
10
mF
GRM188R60OJ106ME
10
mF
Taiyo Yuden
JMK212BY475MG
4.7
mF
JMK212BJ106MG
10
mF
TDK
C2012X5ROJ475KB
4.7
mF
C2012X5ROJ226M
22
mF
C2012X5ROJ106K
10
mF
Feed−Forward Capacitor Selection
The feed−forward capacitor sets the feedback loop
response and is critical to obtain good loop stability.
Given that the compensation is internally fixed, a fixed
18 pF or higher ceramic capacitor is needed. Choose a
small ceramic capacitor X7R or X5R or COG dielectric.


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