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TC1071VCT713 Datasheet(PDF) 11 Page - Microchip Technology

No. de pieza TC1071VCT713
Descripción Electrónicos  50mA, 100mA and 150mA Adjustable CMOS LDOs with Shutdown
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Fabricante Electrónico  MICROCHIP [Microchip Technology]
Página de inicio  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

TC1071VCT713 Datasheet(HTML) 11 Page - Microchip Technology

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© 2007 Microchip Technology Inc.
DS21353D-page 11
TC1070/TC1071/TC1187
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 and 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 4-2) 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 4-2 to ensure regulator thermal operation is
within limits. For example:
Given:
VINMAX
= 3.0V ±10%
VOUTMIN
= 2.7V – 2%
ILOADMAX
= 40 mA
TJMAX
= 125°C
TAMAX
= 55°C
Find: 1. Actual power dissipation
2. Maximum allowable dissipation
Actual power dissipation:
PD ≈ (VINMAX – VOUTMIN)ILOADMAX
= [(3.0 x 1.10) – (2.7 x .0.98)]40 x 10–3
= 26.2 mW
Maximum allowable power dissipation:
In this example, the TC1070 dissipates a maximum of
26.2 mW which is 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:
P D(VINmax – VOUTmin)ILOADmax
PD
VINMAX
VOUTMIN
ILOADMAX
= Worst-case actual power dissipation
= Minimum regulator output voltage
= Maximum output (load) current
= Maximum voltage on VIN
PDMAX = (TJMAX – TAMAX)
θJA
where all terms are previously defined.
PDMAX = (TJMAX – TAMAX)
θJA
= (125 – 55)
220
= 318 mW


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