Motore di ricerca datesheet componenti elettronici
  Italian  ▼
ALLDATASHEETIT.COM

X  

LTM4634 Scheda tecnica(PDF) 17 Page - Linear Technology

Il numero della parte LTM4634
Spiegazioni elettronici  Triple Output 5A/5A/4A Step-Down DC/DC 關Module짰 Regulator
Download  32 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Produttore elettronici  LINER [Linear Technology]
Homepage  http://www.linear.com
Logo LINER - Linear Technology

LTM4634 Scheda tecnica(HTML) 17 Page - Linear Technology

Back Button LTM4634 Datasheet HTML 13Page - Linear Technology LTM4634 Datasheet HTML 14Page - Linear Technology LTM4634 Datasheet HTML 15Page - Linear Technology LTM4634 Datasheet HTML 16Page - Linear Technology LTM4634 Datasheet HTML 17Page - Linear Technology LTM4634 Datasheet HTML 18Page - Linear Technology LTM4634 Datasheet HTML 19Page - Linear Technology LTM4634 Datasheet HTML 20Page - Linear Technology LTM4634 Datasheet HTML 21Page - Linear Technology Next Button
Zoom Inzoom in Zoom Outzoom out
 17 / 32 page
background image
LTM4634
17
4634f
For more information www.linear.com/LTM4634
applicaTions inForMaTion
ceramic capacitor to ground at EXTVCC and ensure the
voltage at CNTL_PWR is always greater than the voltage
at EXTVCC at all times during start-up and shutdown.
Connecting VOUT3 to EXTVCC may present a convenient
way to meet the sequencing requirement. Otherwise float
EXTVCC if not used.
Thermal Considerations and Output Current Derating
The thermal resistances reported in the Pin Configuration
section of the data sheet are consistent with those param-
eters defined by JESD51-12 and are intended for use with
finite element analysis (FEA) software modeling tools that
leverage the outcome of thermal modeling, simulation,
and correlation to hardware evaluation performed on a
µModule package mounted to a hardware test board.
The motivation for providing these thermal coefficients is
found in JESD51-12 (“Guidelines for Reporting and Using
Electronic Package Thermal Information”).
Many designers may opt to use laboratory equipment
and a test vehicle such as the demo board to predict the
µModule regulator’s thermal performance in their appli-
cation at various electrical and environmental operating
conditions to compliment any FEA activities. Without FEA
software, the thermal resistances reported in the Pin Con-
figuration section are, in and of themselves, not relevant
to providing guidance of thermal performance; instead,
the derating curves provided in the data sheet can be used
in a manner that yields insight and guidance pertaining to
one’s application usage, and can be adapted to correlate
thermal performance to one’s own application.
The Pin Configuration section gives four thermal coeffi-
cients explicitly defined in JESD51-12. These coefficients
are quoted or paraphrased as follows:
1.
θJA:Thethermalresistancefromjunctiontoambient,is
the natural convection junction-to-ambient air thermal
resistance measured in a one cubic foot sealed enclo-
sure. This environment is sometimes referred to as
“still air” although natural convection causes the air to
move. This value is determined with the part mounted
to a 95mm
× 76mm PCB with four layers.
2.
θJCbottom: The thermal resistance from the junction to
the bottom of the product case, is determined with all
of the internal power dissipation flowing through the
bottom of the package. In a typical µModule regulator,
the bulk of the heat flows out the bottom of the pack-
age, but there is always heat flow out into the ambient
environment. As a result, this thermal resistance value
may be useful for comparing packages but the test
conditions don’t generally match the user’s application.
3.
θJCtop: The thermal resistance from junction to top of
the product case, is determined with nearly all of the
componentpowerdissipationflowingthroughthetopof
the package. As the electrical connections of the typical
µModule regulator are on the bottom of the package, it
is rare for an application to operate such that most of
the heat flows from the junction to the top of the part.
As in the case of
θJCbottom, this value may be useful
for comparing packages but the test conditions don’t
generally match the user’s application.
4.
θJB: The thermal resistance from junction to the printed
circuitboard,isthejunction-to-boardthermalresistance
where almost all of the heat flows through the bottom
of the µModule package and into the board, and is really
the sum of the
θJCbottom and the thermal resistance of
the bottom of the part through the solder joints and
through a portion of the board. The board temperature
is measured at a specified distance from the package.
A graphical representation of the aforementioned ther-
mal resistances is given in Figure 4; blue resistances are
contained within the μModule regulator, whereas green
resistances are external to the µModule package.
As a practical matter, it should be clear to the reader that
no individual or sub-group of the four thermal resistance
parameters defined by JESD51-12 or provided in the Pin
Configuration section replicates or conveys normal oper-
ating conditions of a μModule regulator. For example, in
normal board-mounted applications, never does 100%
of the device’s total power loss (heat) thermally con-
duct exclusively through the top or exclusively through


Codice articolo simile - LTM4634

Produttore elettroniciIl numero della parteScheda tecnicaSpiegazioni elettronici
logo
Linear Technology
LTM4634 LINER-LTM4634_15 Datasheet
746Kb / 32P
   Triple Output 5A/5A/4A Step-Down DC/DC Module Regulator
More results

Descrizione simile - LTM4634

Produttore elettroniciIl numero della parteScheda tecnicaSpiegazioni elettronici
logo
Linear Technology
LTM4634 LINER-LTM4634_15 Datasheet
746Kb / 32P
   Triple Output 5A/5A/4A Step-Down DC/DC Module Regulator
LTM4625 LINER-LTM4625 Datasheet
1Mb / 26P
   20VIN, 5A Step-Down DC/DC 關Module Regulator
LTM4625 LINER-LTM4625_15 Datasheet
455Kb / 24P
   20VIN, 5A Step-Down DC/DC Module Regulator
logo
Global Mixed-mode Techn...
G5676 GMT-G5676 Datasheet
39Kb / 1P
   5A Synchronous Step-Down DC/DC
G5675 GMT-G5675 Datasheet
48Kb / 1P
   5A Synchronous Step-Down DC/DC
logo
Active-Semi, Inc
ACT4455 ACTIVE-SEMI-ACT4455 Datasheet
674Kb / 15P
   36V/5A Step Down DC/DC Converter
Rev 2, 21-Nov-12
logo
Linear Technology
LTM4624 LINER-LTM4624 Datasheet
347Kb / 26P
   14VIN, 4A Step-Down DC/DC 關Module Regulator
LTM4622 LINER-LTM4622 Datasheet
451Kb / 28P
   Dual Ultrathin 2.5A or Single 5A Step-Down DC/DC 關Module Regulator
logo
Active-Semi, Inc
ACT4455 ACTIVE-SEMI-ACT4455_14 Datasheet
673Kb / 16P
   36V/5A Step Down DC/DC Converter
Rev 2, 21-Nov-12
logo
Analog Devices
LTM4705 AD-LTM4705 Datasheet
1Mb / 24P
   20VIN, Dual 5A or Single 10A Step-Down DC/DC 關Module Regulator
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32


Scheda tecnica Scarica

Go To PDF Page


Link URL




Privacy Policy
ALLDATASHEETIT.COM
Lei ha avuto il aiuto da alldatasheet?  [ DONATE ] 

Di alldatasheet   |   Richest di pubblicita   |   contatti   |   Privacy Policy   |   scambio Link   |   Ricerca produttore
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com