MAX34561T+T Maxim Integrated Products, MAX34561T+T Datasheet - Page 10

• Manufacturer Part Number: MAX34561T+T
• Description: Other Power Management 12V/5V Hot-Plug Switch
• Manufacturer: Maxim Integrated Products

Specifications of MAX34561T+T

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

drop across the corresponding power MOSFET and the
load current. See the Thermal Shutdown with Autoretry
Enabled typical operating curves for details.
The exposed pad is also a heatsink for the device. The
exposed pad should be connected to a large trace or
plane capable of dissipating heat from the device.
It is of utmost importance to properly bypass the device's
supply pins. A decoupling capacitor absorbs the energy
stored in the supply and board parasitic inductance
when the FET is turned off, thereby reducing the magni-
tude of overshoot at V
using a high-quality (low ESR, low ESL) ceramic capaci-
tor connected directly between the V
Any series resistance with this bypass capacitor lowers
its effectiveness and is not recommended. A minimum
0.5µF ceramic capacitor is required. However, depend-
ing on the parasitic inductances present in the end appli-
cation, a larger capacitor could be necessary.
Figure 1. LOAD and ILIM Connections
12V/5V Hot-Plug Switch
10
MAX34561
Applications Information
LOAD
LOAD
LOAD
LOAD
ILIM
CC
. This can be accomplished by
Decoupling Capacitors
R
ILIM
TO APPLICATION
CC
Exposed Pad
and GND pins.
If only one side (5V or 12V) of the device is being used,
it is required that the unused V
VRAMP pins be connected to GND. Leaving these input
pins unconnected can result in interference of the proper
operation of the active portion of the device.
Small parasitic resistances in the bond wires of the LOAD
pins and in the traces connected to the LOAD pins can
result in a voltage offset while current is flowing. Since
the voltage drop across RILIM is used to set the I
I
I
R
that one of the LOAD pins have a dedicated connection
to ILIM though R
current (Figure 1). This would leave three LOAD pins to
pass I
is only a small amount of current passed from this lone
LOAD pin to ILIM, there is a negligible voltage offset
applied to the internal comparator. This method is the
best way to attain an accurate current limit for I
For the latest package outline information and land patterns,
go to www.maxim-ic.com/packages. Note that a “+”, “#”, or
“-” in the package code indicates RoHS status only. Package
drawings may show a different suffix character, but the drawing
pertains to the package regardless of RoHS status.
OVL
SCL
ILIM
24 TQFN-EP
PACKAGE
TYPE
limits, this induced offset can increase the value of
and I
. To greatly reduce this offset, it is recommended
LOAD
OVL
, which should be sufficient. Because there
from the specified values for any given
PACKAGE
ILIM
T2444+4
CODE
LOAD and ILIM Connections
, and not be used to pass the LOAD
Package Information
OUTLINE
21-0139
CC
NO.
, AR, CTIMER, and
Unused Pins
PATTERN NO.
90-0022
LAND
LOAD
SCL
and
.