LM5067MM-2/NOPB National Semiconductor, LM5067MM-2/NOPB Datasheet - Page 22

• Manufacturer Part Number: LM5067MM-2/NOPB
• Description: IC CTLR NEG HOTSWAP A/R 10MSOP
• Manufacturer: National Semiconductor
• Type: Hot-Swap Controllerr

Specifications of LM5067MM-2/NOPB

• Applications: General Purpose
• Internal Switch(s): No
• Voltage - Supply: -9 V ~ -80 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
• For Use With: LM5067EVAL - NEGATIVE HOT SWAP / INRUSH CURRE
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: LM5067MM-2TR

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Thermal Considerations
The LM5067 should be operated so that its junction temper-
ature does not exceed 125°C. The junction temperature is
equal to:
where T
resistance of the LM5067. P
the LM5067, calculated from:
where I
the R
Electrical Chracteristics.
System Considerations
A) Continued proper operation of the LM5067 hot swap circuit
requires capacitance be present on the supply side of the
IN
CC
resistor). Values for R
A
is the ambient temperature, and R
is the current into the VCC pin (the current through
T
J
= T
P
D
A
= 13V x I
+ (R
D
θJA
is the power dissipated within
θJA
and R
FIGURE 18. Output Diode Required for Inductive Loads
CC
x P
D
θJC
)
are in the table of
θJA
is the thermal
22
connector into which the hot swap circuit is plugged in, as
depicted in Figure 2. The capacitor in the “Live Backplane”
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 LM5067, resulting in its de-
struction.
B) If the load powered via the LM5067 hot swap circuit has
inductive characteristics, a diode is required across the
LM5067’s output to provide a recirculating path for the load’s
current. Adding the diode prevents possible damage to the
LM5067 as the OUT pin will be taken above ground by the
inductive load at shutoff. See
Figure
30030963
18.