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PDF NCV8508 Data sheet ( Hoja de datos )
| Número de pieza | NCV8508 | |
| Descripción | 150mA LDO | |
| Fabricantes | ON | |
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NCV8508
5.0 V, 250 mA LDO with
Watchdog and RESET
The NCV8508 is a precision micropower Low Dropout (LDO)
voltage regulator. The part contains many of the required features for
powering microprocessors. Its robustness makes it suitable for severe
automotive environments. In addition, the NCV8508 is ideal for use in
battery operated, microprocessor controlled equipment because of its
extremely low quiescent current.
Features
• Output Voltage: 5.0 V
• ±3.0% Output Voltage
• IOUT Up to 250 mA
• Quiescent Current Independent of Load
• Micropower Compatible Control Functions:
♦ Wakeup
♦ Watchdog
♦ RESET
• Low Quiescent Current (100 mA typ)
• Protection Features:
♦ Thermal Shutdown
♦ Short Circuit
♦ 45 V Operation
• Internally Fused Leads in SO−16L Package
• NCV Prefix for Automotive and Other Applications Requiring Site
and Change Control
• AEC Qualified
• PPAP Capable
• This is a Pb−Free Device*
MRA4004T3
VBAT
NCV8508
C1* VIN
0.1 mF
VOUT
WDI
Delay RESET
RDelay
60 k
GND WAKEUP
C2
1.0 mF
VDD
I/O
RESET
I/O
*C1 required if regulator is located far from power supply filter.
Figure 1. Application Circuit
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16
1
SO−16L
DW SUFFIX
CASE 751G
MARKING
DIAGRAMS
16
NCV85085
AWLYYWWG
1
D2PAK−7
DPS SUFFIX
CASE 936AB
8
1
SO−8 EP
PD SUFFIX
CASE 751AC
NCV85085
AWLYWWG
1
8
V8508
AYWWG
G
1
A
WL
YY, Y
WW
G or G
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Package
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 23 of this data sheet.
*For additional information on our Pb−Free strategy and soldering details, please
download the ON Semiconductor Soldering and Mounting Techniques
Reference Manual, SOLDERRM/D.
© Semiconductor Components Industries, LLC, 2009
October, 2009 − Rev. 27
1
Publication Order Number:
NCV8508/D
1 page  
VIN
RESET
Wakeup
NCV8508
TIMING DIAGRAMS
Wakeup
Duty Cycle = 50%
WDI
VOUT
POR
RESET High
to Wakeup
Delay Time
WDI Pulse Must Occur with Wakeup in
Low State for 50% Duty Cycle.
Reference Figure 17 for Occurrence of
WDI with Wakeup in High State.
Power Up
Microprocessor
Sleep Mode
Normal Operation with Varying Watchdog Signal
Figure 3. Power Up, Sleep Mode and Normal Operation
VIN
RESET
Wakeup
WDI
RESET Delay Time
VOUT
POR
RESET High
to Wakeup
Delay Time
Wakeup
Period
RESET High
to Wakeup
Delay Time
Figure 4. Error Condition: Watchdog Remains Low and a RESET Is Issued
RESET
Wakeup
Wakeup Period
WDI
VOUT
Watchdog
Pulse Width
POR
RESET Threshold
Power Down
POR
Watchdog Pulse Width
Figure 5. Power Down and Restart Sequence
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5
5 Page 
NCV8508
Table 1. SOIC 16−Lead Thermal RC Network Models
96 mm2
767 mm2
Cauer network
C’s C’s Units
1 1.84E−06
1.84E−06
W−s/C
2 8.69E−06
8.69E−06
W−s/C
3 2.61E−05
2.61E−05
W−s/C
4 8.98E−05
8.98E−05
W−s/C
5 2.30E−03
2.30E−03
W−s/C
6 2.99E−02
3.07E−02
W−s/C
7 1.79E−01
1.90E−01
W−s/C
8 7.79E−01
9.94E−01
W−s/C
9 5.34E+00
3.98E+00
W−s/C
96 mm2
767 mm2
Foster network
Tau Tau
2.99E−07
2.99E−07
4.40E−06
4.40E−06
4.62E−05
4.62E−05
5.08E−04
5.08E−04
8.93E−03
8.95E−03
2.04E−01
2.19E−01
3.26E+00
2.75E+00
3.21E+01
2.19E+01
1.24E+02
1.20E+02
Cu Area
units
sec
sec
sec
sec
sec
sec
sec
sec
sec
R’s R’s
R’s R’s
1 0.199
0.199 C/W 0.123
0.123
C/W
2 0.598
0.598 C/W 0.349
0.349
C/W
3 1.795
1.795 C/W 1.057
1.057
C/W
4 4.085
4.085
C/W
4.61
4.61 C/W
5 3.977
3.977
C/W
3.87
3.89 C/W
6 7.509
7.833
C/W
5.77
5.99 C/W
7 19.886
15.247
C/W
13.17
11.38
C/W
8 40.307
24.781
C/W
28.85
15.52
C/W
9 18.193
21.446
C/W
38.75
37.05
C/W
NOTE: Bold face items in the Cauer network above, represent the package without the external thermal system. The Bold face items in
the Foster network are computed by the square root of time constant R(t) = 225 * sqrt(time(sec)). The constant is derived based
on the active area of the device with silicon and epoxy at the interface of the heat generation.
The Cauer networks generally have physical significance and may be divided between nodes to separate thermal behavior
due to one portion of the network from another. The Foster networks, though when sorted by time constant (as above) bear
a rough correlation with the Cauer networks, are really only convenient mathematical models. Cauer networks can be easily
implemented using circuit simulating tools, whereas Foster networks may be more easily implemented using mathematical
tools (for instance, in a spreadsheet program), according to the following formula:
n
SR(t) + i + 1 Ri ǒ1−e−tńtaui Ǔ
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| Páginas | Total 26 Páginas | |
| PDF Descargar | [ Datasheet NCV8508.PDF ] | |
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