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TC2054 Datasheet(PDF) 10 Page - Microchip Technology

Part # TC2054
Description  50 mA, 100 mA, and 150 mA CMOS LDOs with Shutdown and Error Output
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

TC2054 Datasheet(HTML) 10 Page - Microchip Technology

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TC2054/2055/2186
DS21663C-page 10
© 2006 Microchip Technology Inc.
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
primarily a function of input and output voltage, and
output current.
Equation 5-1 is used to calculate worst case 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 (125 °C) and the thermal resistance from
junction-to-air (
θJA). The 5-Pin SOT-23A package has
a
θJA of approximately 220°C/Watt when mounted on a
typical two layer FR4 dielectric copper clad PC board.
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 TC2054 dissipates a maximum of
only 26.7 mW; far 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.
PD VINMAX VOUTMIN
()I
LOADMAX
Where:
PD
= Worst-case actual power dissipation
VINMAX
= Maximum voltage on VIN
VOUTMIN = Minimum regulator output voltage
ILOADMAX = Maximum output (load) current
Where all terms are previously defined.
PDMAX
TJMAX TAMAX
θ
JA
---------------------------------------
=
Given:
VINMAX
= 3.0V +10%
VOUTMIN = 2.7V – 2.5%
ILOADMAX =40 mA
TAMAX
= +55°C
Find:
1. Actual power dissipation
2. Maximum allowable dissipation
PD
VINMAX VOUTMIN
()I
LOADMAX
=
3.0 1.1
×
()
2.7 0.975
×
()
[]40 10
3
×
=
26.7mW
=
PDMAX
TJMAX TAMAX
θ
JA
---------------------------------------
=
125 55
220
---------------------
=
318mW
=


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