MIC2584-JBTS Micrel Inc, MIC2584-JBTS Datasheet - Page 26

• Manufacturer Part Number: MIC2584-JBTS
• Description: IC CTRLR HOT SWAP DUAL 16-TSSOP
• Manufacturer: Micrel Inc
• Type: Hot-Swap Controllerr

Specifications of MIC2584-JBTS

• Applications: General Purpose
• Internal Switch(s): No
• Voltage - Supply: 1 V ~ 13.2 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-TSSOP
• Linear Misc Type: Positive Low Voltage
• Family Name: MIC2584
• Package Type: TSSOP
• Operating Supply Voltage (min): 1V
• Operating Supply Voltage (max): 13.2V
• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Operating Temperature Classification: Industrial
• Product Depth (mm): 4.4mm
• Product Height (mm): 0.9mm
• Product Length (mm): 5mm
• Mounting: Surface Mount
• Pin Count: 16
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

MIC2584/2585
PCB Layout Considerations
Because of the low values of the sense resistors used with the
MIC2584/85 controllers, special attention to the layout must
be used in order for the device’s circuit breaker function to
operate properly. Specifically, the use of a 4-wire Kelvin
connection to accurately measure the voltage across R
is highly recommended. Kelvin sensing is simply a means of
making sure that any voltage drops in the power traces
connecting to the resistors does not get picked up by the
traces themselves. Additionally, these Kelvin connections
should be isolated from all other signal traces to avoid
introducing noise onto these sensitive nodes. Figure 14
illustrates a recommended, multi-layer layout for the R
Power MOSFET, timer(s), and feedback network connec-
tions. The feedback network resistor values are selected for
MIC2584/2585
Figure 14. Recommended PCB Layout for Sense Resistor, Power MOSFET and Feedback Network
Current Flow
to the Load
W
W
DRAWING IS NOT TO SCALE
Similar considerations should be used for Channel 2.
*See Table 5 for part numbers and vendors.
**Optional components.
Trace width (W) guidelines given in "PCB Layout Recommendations" section of the datasheet.
*SENSE RESISTOR
Current Flow
from the Load
(2512)
16
15
14
SENSE
SENSE
13
,
12
26
a 12V application. Many hot swap applications will require
load currents of several amperes. Therefore, the power (V
and Return) trace widths (W) need to be wide enough to allow
the current to flow while the rise in temperature for a given
copper plate (e.g., 1oz. or 2oz.) is kept to a maximum of
10 C ~ 25 C. Also, these traces should be as short as
possible in order to minimize the IR drops between the input
and the load. For a starting point, there are many trace width
calculation tools available on the web such as the following
link:
h t t p : / / w w w . a r a c n e t . c o m / c g i - u s r / g p a t r i c k / t r a c e . p l
Finally, the use of plated-through vias will be needed to make
circuit connections to power and ground planes when utilizing
multi-layer PC boards.
11
**R
10
D
D
D
D
GATE
*POWER MOSFET
9
**C
(SO-8)
Via to
GND plane
GATE
12.4k
1%
Via to
GND plane
G
S
S
S
Current Flow
to the Load
93.1k
1%
W
March 2005
Micrel
CC