參數(shù)資料
型號： NCV8508DW50
廠商： ON SEMICONDUCTOR
元件分類： 基準電壓源/電流源
英文描述： 5.0 V, 250 mA LDO with Watchdog and RESET
中文描述： 5 V FIXED POSITIVE LDO REGULATOR, 0.9 V DROPOUT, PDSO16
封裝： SOP-16
文件頁數(shù)： 10/12頁
文件大?。?/td> 89K
代理商： NCV8508DW50
NCV8508
http://onsemi.com
10
APPLICATION NOTES
Calculating Power Dissipation in a Single Output
Linear Regulator
The maximum power dissipation for a single output
regulator (Figure 19) is:
PD(max)
[VIN(max)
VIN(max)IQ
VOUT(min)]IOUT(max)
(1)
where:
V
IN(max)
is the maximum input voltage,
V
OUT(min)
is the minimum output voltage,
I
OUT(max)
is the maximum output current for the
application, and
I
Q
is the quiescent current the regulator consumes at
I
OUT(max)
.
SMART
REGULATOR
I
Q
Control
Features
I
OUT
I
IN
Figure 19. Single Output Regulator with Key
Performance Parameters Labeled
V
IN
V
OUT
}
Once the value of P
D(max)
is known, the maximum
permissible value of R
JA
can be calculated:
150
°
C
RJA
TA
PD
(2)
The value of R
JA
can then be compared with those in the
package section of the data sheet. Those packages with
R
JA
’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.
Figure 20. 16 Lead SOW (4 Leads Fused), JA as
a Function of the Pad Copper Area (2 oz. Cu
Thickness), Board Material = 0.0625 G10/R4
40
70
90
100
T
J
J
,
°
C
0
Copper Area (inch
2
)
0.5
1.0
1.5
2.0
3.0
80
60
50
2.5
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 R
JA
:
RJA
RJC
RCS
where:
R
JC
= the junctiontocase thermal resistance,
R
CS
= the casetoheatsink thermal resistance, and
R
SA
= the heatsinktoambient thermal resistance.
R
JC
appears in the package section of the data sheet. Like
R
JA
, it too is a function of package type. R
CS
and R
SA
are
functions of the package type, heatsink and the interface
between them. These values appear in heatsink data sheets
of heatsink manufacturers.
RSA
(3)
ORDERING INFORMATION
Device
Output Voltage
Package
Shipping
NCV8508DW50
5.0 V
SO16L
47 Units / Rail
NCV8508DW50G
5.0 V
SO16L
(PbFree)
47 Units / Rail
NCV8508DW50R2
5.0 V
SO16L
1000 / Tape & Reel
NCV8508D2T50
5.0 V
D
2
PAK7
50 Units / Rail
NCV8508D2T50G
5.0 V
D
2
PAK7
(PbFree)
50 Units / Rail
NCV8508D2T50R4
5.0 V
D
2
PAK7
750 / Tape & Reel
For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging
Specifications Brochure, BRD8011/D.
相關PDF資料
PDF描述
NCV8508DW50G 5.0 V, 250 mA LDO with Watchdog and RESET
NCV8508DW50R2 5.0 V, 250 mA LDO with Watchdog and RESET
NCV8664_07 Ultra−Low Iq Low Dropout Linear Regulator
NCV8664ST33T3G Ultra−Low Iq Low Dropout Linear Regulator
NCV8800HDW75 Synchronous Buck Regulator with 1.0 Amp Switch
相關代理商/技術參數(shù)
參數(shù)描述
NCV8508DW50G 功能描述:低壓差穩(wěn)壓器 - LDO 5V 250mA w/WatchDog 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 負載調節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20
NCV8508DW50R2 功能描述:低壓差穩(wěn)壓器 - LDO 5V 250mA w/WatchDog 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 負載調節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20
NCV8508DW50R2G 功能描述:低壓差穩(wěn)壓器 - LDO 5V 250mA w/WatchDog 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 負載調節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20
NCV8508PD50 功能描述:低壓差穩(wěn)壓器 - LDO 5V 250mA w/WatchDog 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 負載調節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20
NCV8508PD50G 功能描述:低壓差穩(wěn)壓器 - LDO 5V 250mA w/WatchDog Reset 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 負載調節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20
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