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TC1055 bảng dữ liệu(PDF) 10 Page - Microchip Technology

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TC1054/TC1055/TC1186
DS21350E-page 10
 2002-2012 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 (
JA). The 5-Pin SOT-23 package has a
JA 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. Layouts having a ground
plane, wide traces at the pads and wide power supply
bus lines, combine to lower θJA and increase the max-
imum allowable power dissipation limit.
P
D
V
INMAX
V
OUTMIN
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.
P
DMAX
T
JMAX
T
AMAX

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
P
D
V
INMAX
V
OUTMIN
I
LOADMAX
3.0
1.05

2.7
0.975

40 10-3
=
20.7mW
=
P
DMAX
T
JMAX
T
AMAX

JA
--------------------------------------------
=
125
55

220
-------------------------
=
318mW
=


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