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參數(shù)資料
| 型號： | NCV4275ADT33RKG |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 固定正電壓單路輸出LDO穩(wěn)壓器 |
| 英文描述： | 450 mA, 3.3 V, LDO w/Reset and Delay |
| 中文描述： | 3.3 V FIXED POSITIVE LDO REGULATOR, 1.17 V DROPOUT, PSSO4 |
| 封裝： | LEAD FREE, DPAK-5 |
| 文件頁數(shù)： | 3/19頁 |
| 文件大小： | 164K |
| 代理商： | NCV4275ADT33RKG |
NCV4275A
http://onsemi.com
11
Calculating Power Dissipation
in a Single Output Linear Regulator
The maximum power dissipation for a single output
regulator (Figure 25) is:
PD(max) + [VI(max) * VQ(min)]IQ(max)
(1)
) VI(max)Iq
where
VI(max)
is the maximum input voltage,
VQ(min)
is the minimum output voltage,
IQ(max)
is the maximum output current for the
application,
Iq
is the quiescent current the regulator
consumes at IQ(max).
Once the value of PD(max) is known, the maximum
permissible value of RqJA can be calculated:
RqJA +
150° C * TA
PD
(2)
The value of RqJA can then be compared with those in the
package section of the data sheet. Those packages with
RqJA’s less than the calculated value in Equation 2 will keep
the die temperature below 150
°C.
In some cases, none of the packages will be sufficient to
dissipate the heat generated by the IC, and an external
heatsink will be required.
SMART
REGULATOR
Iq
Control
Features
IQ
II
Figure 25. Single Output Regulator with Key
Performance Parameters Labeled
VI
VQ
}
Heatsinks
A heatsink effectively increases the surface area of the
package to improve the flow of heat away from the IC and
into the surrounding air.
Each material in the heat flow path between the IC and
the outside environment will have a thermal resistance.
Like series electrical resistances, these resistances are
summed to determine the value of RqJA:
RqJA + RqJC ) RqCS ) RqSA
(3)
where
RqJC is the junctiontocase thermal resistance,
RqCS is the casetoheatsink thermal resistance,
RqSA is the heatsinktoambient thermal
resistance.
RqJC appears in the package section of the data sheet.
Like RqJA, it too is a function of package type. RqCS and
RqSA are functions of the package type, heatsink and the
interface between them. These values appear in heatsink
data sheets of heatsink manufacturers.
Thermal, mounting, and heatsinking considerations are
discussed in the ON Semiconductor application note
AN1040/D.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| NCV4275ADT50RKG | 功能描述:低壓差穩(wěn)壓器 - LDO 450 mA LDO 5V RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| NCV4275ADT50RKG/H | 制造商:ON Semiconductor 功能描述: |
| NCV4275DS | 功能描述:低壓差穩(wěn)壓器 - LDO 5V 450mA RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| NCV4275DSG | 功能描述:低壓差穩(wěn)壓器 - LDO 5V 450mA RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| NCV4275DSR4 | 功能描述:低壓差穩(wěn)壓器 - LDO 5V 450mA RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
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