Electronic Components Datasheet Search
  English  ▼
ALLDATASHEET.NET

X  

LT1086CH Datasheet(PDF) 10 Page - Linear Technology

Part # LT1086CH
Description  1.5A Low Dropout Positive Regulators Adjustable and Fixed 2.85V, 3.3V, 3.6V, 5V, 12V
Download  16 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT1086CH Datasheet(HTML) 10 Page - Linear Technology

Back Button LT1086CH Datasheet HTML 6Page - Linear Technology LT1086CH Datasheet HTML 7Page - Linear Technology LT1086CH Datasheet HTML 8Page - Linear Technology LT1086CH Datasheet HTML 9Page - Linear Technology LT1086CH Datasheet HTML 10Page - Linear Technology LT1086CH Datasheet HTML 11Page - Linear Technology LT1086CH Datasheet HTML 12Page - Linear Technology LT1086CH Datasheet HTML 13Page - Linear Technology LT1086CH Datasheet HTML 14Page - Linear Technology Next Button
Zoom Inzoom in Zoom Outzoom out
 10 / 16 page
background image
10
LT1086 Series
APPLICATIONS INFORMATION
Load Regulation
Because the LT1086 is a 3-terminal device, it is not
possible to provide true remote load sensing. Load regu-
lation will be limited by the resistance of the wire connect-
ing the regulator to the load. The data sheet specification
for load regulation is measured at the bottom of the
package. Negative side sensing is a true Kelvin connec-
tion, with the bottom of the output divider returned to the
negative side of the load. Although it may not be immedi-
ately obvious, best load regulation is obtained when the
top of the resistor divider R1 is connected
directly to the
case
not to the load. This is illustrated in Figure 2. If R1
were connected to the load, the effective resistance be-
tween the regulator and the load would be:
RP
, RP = Parasitic Line Resistance
R2 + R1
R1
()
Thermal Considerations
The LT1086 series of regulators have internal power and
thermal limiting circuitry designed to protect the device
under overload conditions. For continuous normal load
conditions however, maximum junction temperature rat-
ings must not be exceeded. It is important to give careful
consideration to all sources of thermal resistance from
junction to ambient. This includes junction-to-case, case-
to-heat sink interface and heat sink resistance itself. New
thermal resistance specifications have been developed to
more accurately reflect device temperature and ensure
safe operating temperatures. The data section for these
new regulators provides a separate thermal resistance and
maximum junction temperature for both the
Control Sec-
tion and the Power Transistor. Previous regulators, with a
single junction-to-case thermal resistance specification,
used an average of the two values provided here and
therefore could allow excessive junction temperatures
under certain conditions of ambient temperature and heat
sink resistance. To avoid this possibility, calculations
should be made for both sections to ensure that both
thermal limits are met.
For example, using a LT1086CK (TO-3, Commercial) and
assuming:
VIN(max continuous) = 9V, VOUT = 5V, IOUT = 1A,
TA = 75°C, θHEAT SINK = 3°C/W,
θCASE-TO-HEAT SINK = 0.2°C/W for K package with
thermal compound.
Power dissipation under these conditions is equal to:
PD = (VIN – VOUT)(IOUT) = 4W
Junction temperature will be equal to:
TJ = TA + PD HEAT SINK + θCASE-TO-HEAT SINK + θJC)
For the Control Section:
TJ = 75°C + 4W(3°C/W + 0.2°C/ W + 0.7°C/W) = 95°C
95
°C < 125°C = TJMAX (Control Section
Commercial Range)
For the Power Transistor:
TJ = 75°C + 4W(3°C/ W + 0.2°C/W + 4°C/ W) = 103.8°C
103.8
°C < 150°C = TJMAX (Power Transistor
Commercial Range)
LT1086
OUT
IN
VIN
ADJ
RP
PARASITIC
LINE RESISTANCE
R1*
*CONNECT R1 TO CASE
CONNECT R2 TO LOAD
1086 • F02
RL
R2*
Figure 2. Connections for Best Load Regulation
Connected as shown RP is not multiplied by the divider
ratio. RP is about 0.004Ω per foot using 16-gauge wire.
This translates to 4mV/ft at 1A load current, so it is
important to keep the positive lead between regulator and
load as short as possible and use large wire or PC board
traces.
Note that the resistance of the package leads for the H
package
≈0.06Ω/inch. While it is usually not possible to
connect the load directly to the package, it is possible to
connect larger wire or PC traces close to the case to avoid
voltage drops that will degrade load regulation.
For fixed voltage devices the top of R1 is internally Kelvin
connected and the ground pin can be used for negative
side sensing.


Similar Part No. - LT1086CH

ManufacturerPart #DatasheetDescription
logo
Linear Technology
LT1086CH LINER-LT1086CH Datasheet
217Kb / 16P
   1.5A Low Dropout Positive Regulators Adjustable and Fixed 2.85V, 3.3V, 3.6V, 5V, 12V
More results

Similar Description - LT1086CH

ManufacturerPart #DatasheetDescription
logo
Linear Technology
LT1086 LINER-LT1086_15 Datasheet
226Kb / 16P
   1.5A Low Dropout Positive Regulators Adjustable and Fixed 2.85V, 3.3V, 3.6V, 5V, 12V
LT1086 LINER-LT1086_04 Datasheet
217Kb / 16P
   1.5A Low Dropout Positive Regulators Adjustable and Fixed 2.85V, 3.3V, 3.6V, 5V, 12V
LT1117 LINER-LT1117_15 Datasheet
194Kb / 16P
   800mA Low Dropout Positive Regulators Adjustable and Fixed 2.85V, 3.3V, 5V
LT1117-5 LINER-LT1117-5_15 Datasheet
194Kb / 16P
   800mA Low Dropout Positive Regulators Adjustable and Fixed 2.85V, 3.3V, 5V
LT1117-2.85 LINER-LT1117-2.85_15 Datasheet
194Kb / 16P
   800mA Low Dropout Positive Regulators Adjustable and Fixed 2.85V, 3.3V, 5V
LT1117 LINER-LT1117_02 Datasheet
201Kb / 12P
   800mA Low Dropout Positive Regulators Adjustable and Fixed 2.85V, 3.3V, 5V
LT1117 LINER-LT1117_1 Datasheet
189Kb / 16P
   800mA Low Dropout Positive Regulators Adjustable and Fixed 2.85V, 3.3V, 5V
LT1117-3.3 LINER-LT1117-3.3_15 Datasheet
194Kb / 16P
   800mA Low Dropout Positive Regulators Adjustable and Fixed 2.85V, 3.3V, 5V
LT1117 LINER-LT1117 Datasheet
282Kb / 12P
   800mA Low Dropout Positive Regulators Adjustable and Fixed 2.85V, 3.3V, 5V
logo
Anpec Electronics Corop...
APL1086 ANPEC-APL1086_08 Datasheet
229Kb / 15P
   1.5A Low Dropout Fast Response Positive Adjustable Regulator and Fixed 1.8V, 2.5V, 2.85V, and 3.3V
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16


Datasheet Download

Go To PDF Page


Link URL




Privacy Policy
ALLDATASHEET.NET
Does ALLDATASHEET help your business so far?  [ DONATE ] 

About Alldatasheet   |   Advertisement   |   Contact us   |   Privacy Policy   |   Link Exchange   |   Manufacturer List
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