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MIC5166 Datasheet(PDF) 18 Page - Microchip Technology

No. de pieza MIC5166
Descripción Electrónicos  3A High-Speed, Low-VIN DDR Terminator
PDF  36 Pages
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Fabricante Electrónico  MICROCHIP [Microchip Technology]
Página de inicio  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MIC5166 Datasheet(HTML) 18 Page - Microchip Technology

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MIC5166
DS20006085B-page 18
 2018 - 2019 Microchip Technology Inc.
5.5
Thermal Measurements
It is always wise to measure the IC’s case temperature
to make sure that it is within its operating limits.
Although this might seem like a very elementary task, it
is very easy to get erroneous results. The most
common mistake is to use the standard thermocouple
that comes with the thermal voltage meter. This
thermocouple wire gauge is large, typically 22 gauge,
and behaves like a heat sink, resulting in a lower case
measurement.
There are two suggested methods for measuring the IC
case temperature: a thermocouple or an infrared
thermometer. If a thermocouple is used, it must be
constructed of 36 gauge wire or higher to minimize the
wire heat sinking effect. In addition, the thermocouple
tip must be covered in either thermal grease or thermal
glue to make sure that the thermocouple junction
makes good contact to the case of the IC. This
thermocouple from Omega (5SC-TT-K-36-36) is
adequate for most applications.
To avoid this messy thermocouple grease or glue, an
infrared thermometer is recommended. Most infrared
thermometers’ spot size is too large for an accurate
reading on small form factor ICs. However, an IR
thermometer from Optris has a 1 mm spot size, which
makes it ideal for the 3 mm x 3 mm DFN package.
5.6
Sequencing
The following diagrams
illustrate
methods for
connecting
MIC5166s
to
achieve
sequencing
requirements:
FIGURE 5-1:
Turn-On Sequence with
Soft-Start (RC = 3.3 nF).
PVIN
SW
FB
PG
22μF
x4
VDDQ
1.8V/7A
1.0μH
PGND
47μF
x2
MIC22705
PG1
COMP
VIN
5.0V
EN/DLY
EN1
4
SGND
20
39pF
SVIN
RC
3.3nF
EP
DELAY
R1
1.10
R2
69
VTT
1.0μF
22μF
AGND
EN
EP
VDDQ
4.7μF
MIC5166
BIAS
VDDQ
SNS
10μF
VIN
EN2
VTT
0.9V/±3A
PG
PG2
PGND
VREF
1.0μF
VREF
10mA
EN/EN2
V
DDQ
V
TT
V
IN = 5V
V
DDQ = 1.8V
V
TT = 0.9V
I
OUT1 = 1A
I
OUT2 = 1A
R
C = 3.3nF
Time (4ms/div)



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