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TC1263 Datasheet(PDF) 5 Page - Microchip Technology

No. de pieza TC1263
Descripción Electrónicos  500mA Fixed Output CMOS LDO with Shutdown
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Fabricante Electrónico  MICROCHIP [Microchip Technology]
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© 2002 Microchip Technology Inc.
DS21374B-page 5
TC1263
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
(
θJA).
EQUATION 4-2:
Table 4-1 and Table 4-2 show various values of
θJA for
the TC1263 packages.
TABLE 4-1:
THERMAL RESISTANCE
GUIDELINES FOR TC1263 IN
8-PIN SOIC PACKAGE
*Pin 2 is ground. Device is mounted on topside.
TABLE 4-2:
THERMAL RESISTANCE
GUIDELINES FOR TC1263 IN
3-PIN TO-220/DDPAK
PACKAGE
*Tab of device attached to topside copper
Equation 4-1 can be used in conjunction with Equation
4-2 to ensure regulator thermal operation is within
limits. For example:
Given:
VINMAX
= 3.3V ± 10%
VOUTMIN = 2.7V ± 0.5%
ILOADMAX = 275mA
TJMAX
= 125°C
TAMAX
=95°C
θJA
=60°C/W
Find: 1. Actual power dissipation
2. Maximum allowable dissipation
Actual power dissipation:
PD ≈ (VINMAX –VOUTMIN)ILOADMAX
= [(3.3 x 1.1) – (2.7 x .995)]275 x 10–3
= 260mW
Maximum allowable power dissipation:
In this example, the TC1263 dissipates a maximum of
260mW; below the allowable limit of 500mW. In a
similar manner, Equation 4-1 and Equation 4-2 can be
used to calculate maximum current and/or input
voltage limits. For example, the maximum allowable
VIN, is found by substituting the maximum allowable
power dissipation of 500mW into Equation 4-1, from
which VINMAX =4.6V.
Copper
Area
(Topside)*
Copper
Area
(Backside)
Board
Area
Thermal
Resistance
JA)
2500 sq mm 2500 sq mm
2500 sq mm
60°C/W
1000 sq mm 2500 sq mm
2500 sq mm
60°C/W
225 sq mm
2500 sq mm
2500 sq mm
68°C/W
100 sq mm
2500 sq mm
2500 sq mm
74°C/W
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)
θ
JA
Where all terms are previously defined.
Copper
Area
(Topside)*
Copper
Area
(Backside)
Board
Area
Thermal
Resistance
JA)
2500 sq mm 2500 sq mm
2500 sq mm
25°C/W
1000 sq mm 2500 sq mm
2500 sq mm
27°C/W
125 sq mm
2500 sq mm
2500 sq mm
35°C/W
PDMAX =(TJMAX –TAMAX)
θJA
= (125 – 95)
60
=500mW


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