参数资料
型号: MCP1727T-0802E/SN
厂商: Microchip Technology
文件页数: 22/32页
文件大小: 0K
描述: IC REG LDO 0.8V 1.5A 8SOIC
产品培训模块: High Current LDOs
标准包装: 3,300
稳压器拓扑结构: 正,固定式
输出电压: 0.8V
输入电压: 2.3 V ~ 6 V
电压 - 压降(标准): 0.33V @ 1.5A
稳压器数量: 1
电流 - 输出: 1.5A(最小)
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 8-SOIC(0.154",3.90mm 宽)
供应商设备封装: 8-SOICN
包装: 带卷 (TR)
MCP1727
5.3.1.2
Junction Temperature Estimate
5.4
C DELAY Calculations (typical)
C = I ? -------
To estimate the internal junction temperature, the
calculated temperature rise is added to the ambient or
offset temperature. For this example, the worst-case
junction temperature is estimated below:
Where:
Δ T
Δ V
T J = T JRISE + T A(MAX)
T J = 63.14°C + 60.0°C
T J = 123.14°C
As you can see from the result, this application will be
operating very near the maximum operating junction
C
I
Δ T
Δ V
=
=
=
=
C DELAY Capacitor
C DELAY charging current,
140 nA typical.
time delay
C DELAY threshold voltage,
0.42V typical
C = I ? ------- = ---------------------------------- = 333.3 × 10
temperature of 125°C. The PCB layout for this
application is very important as it has a significant
impact on the junction-to-ambient thermal resistance
(R θ JA ) of the 3x3 DFN package, which is very important
in this application.
Δ T ( 140 nA ? Δ T ) – 09
Δ V 0.42 V
For a delay of 300 ms:
C = 333.3E-09 * .300
? Δ T
5.3.1.3
Maximum Package Power
Dissipation at 60°C Ambient
C = 100E-09uF (0.1 μ F)
Temperature
3x3DFN (41° C/W R θ JA ):
P D(MAX) = (125°C – 60°C) / 41° C/W
P D(MAX) = 1.585W
SOIC8 (150°C/Watt R θ JA ):
P D(MAX) = (125°C – 60°C)/ 150° C/W
P D(MAX) = 0.433W
From this table, you can see the difference in maximum
allowable power dissipation between the 3x3 DFN
package and the 8-pin SOIC package. This difference
is due to the exposed metal tab on the bottom of the
DFN package. The exposed tab of the DFN package
provides a very good thermal path from the die of the
LDO to the PCB. The PCB then acts like a heatsink,
providing more area to distribute the heat generated by
the LDO.
DS21999B-page 22
? 2007 Microchip Technology Inc.
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