MCP73830SLASHLT datasheet(15/24 Pages) MICROCHIP

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DS20005049E-page 15

MCP73830/L

Virtually any good quality output filter capacitor can be

used independent of the capacitor’s minimum Effective

Series Resistance (ESR) value. The actual value of the

capacitor (and its associated ESR) depends on the

output load current. A 1 µF ceramic, tantalum or alumi-

num electrolytic capacitor at the output is usually

sufficient to ensure stability.

6.1.1.4

Reverse-Blocking Protection

The MCP73830/L devices provide protection from a

faulted or shorted input. Without the protection, a

faulted or shorted input would discharge the battery

pack through the body diode of the internal pass

transistor.

6.2

PCB Layout Issues

For optimum voltage regulation, place the battery pack

as close as possible to the device’s VBAT and VSS pins,

which is recommended to minimize voltage drops

along the high current carrying PCB traces.

If the PCB layout is used as a heat sink, adding many

vias in the heat sink pad can help conduct more heat to

the backplane of the PCB, thus reducing the maximum

junction temperature. Figure 6-5 and Figure 6-6 depict

a typical layout with PCB heat sinking.

FIGURE 6-4:

Typical Layout (Top).

FIGURE 6-5:

Typical Layout (Top Metal).

FIGURE 6-6:

Typical Layout (Bottom).

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