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TC1054 Datasheet(PDF) 10 Page - Microchip Technology

No. de pieza TC1054
Descripción Electrónicos  50 mA, 100 mA and 150 mA CMOS LDOs with Shutdown and ERROR Output
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Fabricante Electrónico  MICROCHIP [Microchip Technology]
Página de inicio  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

TC1054 Datasheet(HTML) 10 Page - Microchip Technology

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TC1054/TC1055/TC1186
DS21350D-page 10
© 2007 Microchip Technology Inc.
5.0
THERMAL CONSIDERATIONS
5.1
Thermal Shutdown
Integrated thermal protection circuitry shuts the
regulator off when die temperature exceeds 160°C.
The regulator remains off until the die temperature
drops to approximately 150°C.
5.2
Power Dissipation
The amount of power the regulator dissipates is
primarily a function of input voltage, output voltage and
output current. The following equation is used to
calculate worst case actual power dissipation:
EQUATION 5-1:
The
maximum
allowable
power
dissipation
(Equation 5-2) is a function of the maximum ambient
temperature (TAMAX), the maximum allowable die
temperature (TJMAX) and the thermal resistance from
junction-to-air (
θJA). The 5-Pin SOT-23 package has a
θJA of approximately 220°C/Watt.
EQUATION 5-2:
Equation 5-1 can be used in conjunction with
Equation 5-2 to ensure regulator thermal operation is
within limits.
For example:
Actual power dissipation:
Maximum allowable power dissipation:
In this example, the TC1054 dissipates a maximum of
20.7 mW; below the allowable limit of 318 mW. In a
similar manner, Equation 5-1 and Equation 5-2 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
θJA and, therefore,
increase the maximum allowable power dissipation
limit.
Where:
PD
VINMAX
VOUTMIN
ILOADMAX
= Worst case actual power dissipation
= Minimum regulator output voltage
= Maximum output (load) current
= Maximum voltage on VIN
PD
VINMAX VOUTMIN
()I
LOADMAX
Where all terms are previously defined.
PDMAX
TJMAX TAMAX
()
θ
JA
--------------------------------------------
=
Given:
VINMAX
= 3.0V +5%
VOUTMIN
= 2.7V – 2.5%
ILOADMAX
= 40 mA
TJMAX
= +125°C
TAMAX
= +55°C
Find:
1.
Actual power dissipation
2.
Maximum allowable dissipation
PD
VINMAX VOUTMIN
()I
LOADMAX
3.0 1.05
×
()
2.7 0.975
×
()
[]40 10
-3
×
=
20.7mW
=
PDMAX
TJMAX TAMAX
()
θ
JA
--------------------------------------------
=
125 55
()
220
-------------------------
=
318mW
=


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