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R1221N33AA-TR Datasheet(PDF) 10 Page - RICOH electronics devices division

Part # R1221N33AA-TR
Description  Step-down DC/DC Converter with Voltage Detector
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Manufacturer  RICOH [RICOH electronics devices division]
Direct Link  http://www.ricoh.com
Logo RICOH - RICOH electronics devices division

R1221N33AA-TR Datasheet(HTML) 10 Page - RICOH electronics devices division

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Rev. 1.11
- 10 -
3. Capacitor
As for CIN, use a capacitor with low ESR(Equivalent Series Resistance) and a capacity of at least 10
mF for stable
operation.
COUT can reduce ripple of Output Voltage, therefore 47
mF to 100mF tantalum type is recommended.
4. Lx Transistor
Pch Power MOS FET is required for this IC.
Its breakdown voltage between gate and source should be a few volt higher than Input Voltage.
In the case of Input Voltage is low, to turn on MOS FET completely, select a MOS FET with low threshold voltage.
If a large load current is necessary for your application and important, choose a MOS FET with low ON resistance
for good efficiency.
If a small load current is mainly necessary for your application, choose a MOS FET with low gate capacity for good
efficiency.
Maximum continuous drain current of MOS FET should be larger than peak current, ILmax.


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