Electronic Components Datasheet Search
  English  ▼

Delete All


Preview PDF Download HTML

TC1173 Datasheet(PDF) 4 Page - TelCom Semiconductor, Inc

Part No. TC1173
Description  300mA CMOS LDO with Shutdown, ERROR Output and Bypass
Download  7 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  TELCOM [TelCom Semiconductor, Inc]
Direct Link  http://www.telcom-semi.com
Logo TELCOM - TelCom Semiconductor, Inc

TC1173 Datasheet(HTML) 4 Page - TelCom Semiconductor, Inc

  TC1173 Datasheet HTML 1Page - TelCom Semiconductor, Inc TC1173 Datasheet HTML 2Page - TelCom Semiconductor, Inc TC1173 Datasheet HTML 3Page - TelCom Semiconductor, Inc TC1173 Datasheet HTML 4Page - TelCom Semiconductor, Inc TC1173 Datasheet HTML 5Page - TelCom Semiconductor, Inc TC1173 Datasheet HTML 6Page - TelCom Semiconductor, Inc TC1173 Datasheet HTML 7Page - TelCom Semiconductor, Inc  
Zoom Inzoom in Zoom Outzoom out
 4 / 7 page
background image
300mA CMOS LDO With Shutdown,
ERROR Output, And Bypass
Bypass Input
A 470pF capacitor connected from the Bypass input to
ground reduces noise present on the internal reference,
which in turn significantly reduces output noise. If output
noise is not a concern, this input may be left unconnected.
Larger capacitor values may be used, but results in a longer
time period to rated output voltage when power is initially
Thermal Considerations
Thermal Shutdown
Integrated thermal protection circuitry shuts the regula-
tor off when die temperature exceeds 150
°C. The regulator
remains off until the die temperature drops to approximately
Power Dissipation
The amount of power the regulator dissipates is prima-
rily a function of input and output voltage, and output current.
The following equation is used to calculate worst case
power dissipation:
PD = worst case actual power dissipation
VINMAX = maximum voltage on VIN
VOUTMIN = minimum regulator output voltage
ILOADMAX = maximum output (load) current
Equation 1.
The maximum
allowable power dissipation (Equation 2)
is a function of the maximum ambient temperature (TAMAX),
the maximum allowable die temperature (125
°C), and the
thermal resistance from junction-to-air ( JA). The 8-Pin
SOIC package has a
JA of approximately 160
while the 8-Pin MSOP package has a JA of approximately
°C/Watt; both when mounted on a single layer FR4
dielectric copper clad PC board.
Where all terms are previously defined.
Equation 2.
Equation 1 can be used in conjunction with Equation 2
to ensure regulator thermal operation is within limits. For
VINMAX= 3.0V ± 10%
VOUTMIN= 2.7V ± 0.5%
TJMAX = 125°C
TAMAX = 55°C
JA = 200°C/W
8-Pin MSOP Package
1. Actual power dissipation
2. Maximum allowable dissipation
Actual power dissipation:
= [(3.0 x 1.1) - (2.7 x .995)]250 x 10-3
= 155mW
Maximum allowable power dissipation:
= (125 – 55)
= 350mW
In this example, the TC1173 dissipates a maximum of
only 155mW; far below the allowable limit of 350mW. In a
similar manner, Equation 1 and Equation 2 can be used to
calculate maximum current and/or input voltage limits. For
example, the maximum allowable VIN is found by substitut-
ing the maximum allowable power dissipation of 350mW
into Equation 1, from which VINMAX = 4.1V.
Layout Considerations
The primary path of heat conduction out of the package
is via the package leads. Therefore, layouts having a ground
plane, wide traces at the pads, and wide power supply bus
lines combine to lower
JA and, therefore, increase the
maximum allowable power dissipation limit.

Html Pages

1  2  3  4  5  6  7 

Datasheet Download

Go To PDF Page

Link URL

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

About Alldatasheet   |   Advertisement   |   Datasheet Upload   |   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