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参数资料
| 型号： | TC1073-2.85VCH713 |
| 元件分类： | 固定正电压单路输出LDO稳压器 |
| 英文描述： | 2.85 V FIXED POSITIVE LDO REGULATOR, 0.25 V DROPOUT, PDSO6 |
| 封装： | PLASTIC, SOT-23, 6 PIN |
| 文件页数： | 5/22页 |
| 文件大小： | 713K |
| 代理商： | TC1073-2.85VCH713 |
2007 Microchip Technology Inc.
DS21354D-page 13
TC1072/TC1073
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 5-2) is a function of the maximum ambient
temperature (TAMAX), the maximum allowable die tem-
perature (TJMAX) and the thermal resistance from junc-
tion-to-air (
θJA). The 6-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 5-2 to ensure regulator thermal operation is
within limits. For example:
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
Actual power dissipation:
PD ≈ (VINMAX – VOUTMIN)ILOADMAX
= [(3.0 x 1.05) – (2.7 x 0.975)] x 40 x 10–3
= 20.7 mW
Maximum allowable power dissipation:
In this example, the TC1072 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. 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:
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)
θJA
where all terms are previously defined.
PDMAX = (TJMAX – TAMAX)
θJA
= (125 – 55)
220
= 318 mW
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