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TC1266 Scheda tecnica(PDF) 5 Page - Microchip Technology

Il numero della parte TC1266
Spiegazioni elettronici  200mA PCI LDO
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Produttore elettronici  MICROCHIP [Microchip Technology]
Homepage  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

TC1266 Scheda tecnica(HTML) 5 Page - Microchip Technology

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 2001-2012 Microchip Technology Inc.
DS21377C-page 5
TC1266
4.0
THERMAL CONSIDERATIONS
4.1
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.
4.2
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 4-1:
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 (
JA).
EQUATION 4-2:
Equation 4-1
can
be
used
in
conjunction
with
Equation 4-2 to ensure regulator thermal operation is
within limits. For example:
Given:
VINMAX
= 5V ± 5%
VOUTMIN = 3.217V
ILOADMAX = 200mA
TJMAX
= 125°C
TAMAX
= 70°C
JA
= 130°C/W (SOIC)
Find: 1. Actual power dissipation
2. Maximum allowable dissipation
Actual power dissipation:
PD  (VINMAX – VOUTMIN)ILOADMAX
= (5.25V - 3.217V) 200mA
= 407mW
Maximum allowable power dissipation:
In this example, the TC1266 dissipates a maximum of
407mW; below the allowable limit of 423mW.
Where:
PD  (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)
JA
Where all terms are previously defined.
PDMAX = (TJMAX – TAMAX)
JA
= (125 – 70)
130
= 423mW


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