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TC2015-2.7VCTTR Datasheet(PDF) 11 Page - Microchip Technology

Part # TC2015-2.7VCTTR
Description  50 mA, 100 mA, 150 mA CMOS LDOs
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

TC2015-2.7VCTTR Datasheet(HTML) 11 Page - Microchip Technology

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 2001-2012 Microchip Technology Inc.
DS21662F-page 11
TC2014/2015/2185
5.0
THERMAL CONSIDERATIONS
5.1
Thermal Shutdown
Integrated thermal protection circuitry shuts the regula-
tor off when the die temperature exceeds approxi-
mately 160°C. The regulator remains off until the die
temperature cools to approximatley 150°C.
5.2
Power Dissipation
The amount of power the regulator dissipates is primar-
ily a function of input voltage, output voltage and output
current.
The following equation is used to calculate worst-case
power dissipation.
EQUATION 5-1:
The maximum allowable power dissipation (PDMAX) is
a function of the maximum ambient temperature
(TAMAX), the maximum allowable die temperature
(TJMAX) (+125°C) and the thermal resistance from junc-
tion-to-air (
JA). The 5-Pin SOT-23A package has a JA
of approximately 220°C/Watt when mounted on a
typical two-layer FR4 dielectric copper-clad PC board.
EQUATION 5-2:
The PD equation can be used in conjunction with the
PDMAX equation to ensure that regulator thermal
operation is within limits. For example:
Actual power dissipation:
Maximum allowable power dissipation:
In this example, the TC2014 dissipates a maximum of
only 26.7 mW; far below the allowable limit of 318 mW.
In a similar manner, the PD and PDMAX equations can
be used to calculate maximum current and/or input
voltage limits.
5.3
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.
P
D
V
INMAX
V
OUTMIN
I
LMAX
Where:
PD
= Worst-case actual power dissipation
VINMAX
= Maximum voltage on VIN
VOUTMIN = Minimum regulator output voltage
ILMAX
= Maximum output (load) current
Where all terms are previously defined.
P
DMA X
T
JMAX
T
AMAX
JA
---------------------------------------
=
Given:
VINMAX
= 3.0V +10%
VOUTMIN
= 2.7V – 2.5%
ILOADMAX =40 mA
TJMAX
= +125°C
TAMAX
= +55°C
Find:
1. Actual power dissipation
2. Maximum allowable dissipation
P
D
V
INMA X
V
OUTMIN
I
LMAX
=
3.0
1.1

2.7
0.975

40 10
3
=
26.7mW
=
P
DMAX
T
JMAX
T
AMAX
JA
---------------------------------------
=
125
55
220
---------------------
=
318mW
=


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