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LM3351 Datasheet(PDF) 6 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. LM3351
Description  Switched Capacitor Voltage Converter
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
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 6 page
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Typical Application Circuits
Layout Information
LAYOUT CONSIDERATIONS
The LM3351’s high switching frequency (200 kHz) makes a good layout important.
Figure 3 illustrates a typical layout. It is im-
portant to keep the distance short between the four capacitors and the IC. Wide traces and grounding are also recommended.
These steps will minimize trace inductance and high frequency ringing. Of the four capacitors, C
IN and COUT have the highest
value of di/dt. It is therefore most important to keep them close to the IC. The ground lead that C
IN and COUT share should also
be kept wide and short.
The location of the diode (D1) used in the step-up configuration is not critical. This diode is only used during the initial turn on of
the IC. D1 is not needed in step-down applications.
DS100146-12
FIGURE 1. Step-Up Converter
DS100146-13
FIGURE 2. Step-Down Converter
www.national.com
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