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TC1108-30VDB Datasheet(PDF) 4 Page - Microchip Technology

No. de pieza TC1108-30VDB
Descripción Electrónicos  300mA CMOS LDO
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Fabricante Electrónico  MICROCHIP [Microchip Technology]
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TC1108-30VDB Datasheet(HTML) 4 Page - Microchip Technology

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TC1108
DS21357B-page 4
© 2002 Microchip Technology Inc.
4.0
THERMAL CONSIDERATIONS
4.1
Thermal Shutdown
Integrated
thermal
protection
circuitry
shuts
the
regulator off when die temperature exceeds 150°C.
The regulator remains off until the die temperature
drops to approximately 140°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 shows various values of
θJA for the TC1108
versus board copper area.
TABLE 4-1:
THERMAL RESISTANCE
GUIDELINES FOR TC1108
NOTE: *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
=59°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 TC1108 dissipates a maximum of
260mW; below the allowable limit of 508mW. 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 sustituting the maximum allowable
power dissipation of 508mW into Equation 4-1, from
which VINMAX =4.6V.
Copper
Area
(Topside)*
Copper
Area
(Backside)
Board
Area
Thermal
Resistance
(
θJA)
2500 sq mm 2500 sq mm
2500 sq mm
45°C/W
1000 sq mm 2500 sq mm
2500 sq mm
45°C/W
225 sq mm
2500 sq mm
2500 sq mm
53°C/W
100 sq mm
2500 sq mm
2500 sq mm
59°C/W
1000 sq mm 1000 sq mm
1000 sq mm
52°C/W
1000 sq mm
0 sq mm
1000 sq mm
55°C/W
Where:
PD ≈ (VINMAX –VOUTMIN)ILOADMAX
VINMAX
VOUTMIN
ILOADMAX
= Worst case actual power dissipation
= Minimum regulator output voltage
= Maximum output (load) current
= Maximum voltage on VIN
PD
PDMAX =(TJMAX –TAMAX)
θJA
Where all terms are previously defined.
PDMAX =(TJMAX –TAMAX)
θJA
= (125 – 95)
59
= 508mW


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