LM25061MM-2EVAL National Semiconductor, LM25061MM-2EVAL Datasheet - Page 18

• Manufacturer Part Number: LM25061MM-2EVAL
• Description: BOARD EVALUATION LM25061
• Manufacturer: National Semiconductor

Specifications of LM25061MM-2EVAL

• Main Purpose: Power Management, Hot Swap Controller
• Embedded: No
• Utilized Ic / Part: LM25061-2
• Primary Attributes: High Side MOSFET Driver, Inrush Current Limiting
• Secondary Attributes: Auto Restart, 2.9 V ~ 17 V Supply
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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System Considerations
A) Continued proper operation of the LM25061 hot swap cir-
cuit requires capacitance be present on the supply side of the
connector into which the hot swap circuit is plugged in, as
depicted in
section is necessary to absorb the transient generated when-
ever the hot swap circuit shuts off the load current. If the
capacitance is not present, inductance in the supply lines will
generate a voltage transient at shut-off which can exceed the
absolute maximum rating of the LM25061, resulting in its de-
struction.
Figure
2. The capacitor in the “Live Power Source”
FIGURE 17. Output Diode Required for Inductive Loads
FIGURE 16. Recommended Board Connector Design
18
B) If the load powered by the LM25061 hot swap circuit has
inductive characteristics, a Schottky diode is required across
the LM25061’s output, along with some load capacitance.
The capacitance and the diode are necessary to limit the
negative excursion at the OUT pin when the load current is
shut off. If the OUT pin transitions more than 0.3V negative
the LM25061 will internally reset, interfering with the latch-off
feature of the LM25061-1, or the restart cycle of the
LM25061-2. See
Figure
17.
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