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PDF CS8221 Data sheet ( Hoja de datos )
| Número de pieza | CS8221 | |
| Descripción | Low Dropout Linear Regulator | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de CS8221 (archivo pdf) en la parte inferior de esta página. Total 7 Páginas | ||
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CS8221
Micropower 5.0 V, 100 mA
Low Dropout Linear
Regulator
The CS8221 is a precision 5.0 V, 100 mA micropower voltage
regulator with very low quiescent current (60 mA typical at 100 mA
load). The 5.0 V output is accurate within ±2.0% and supplies 100 mA
of load current with a maximum dropout voltage of only 600 mV.
The regulator is protected against reverse battery, short circuit,
overvoltage, and over temperature conditions. The device can withstand
74 V peak transients making it suitable for use in automotive
environments. The CS8221 is pin for pin compatible with the LM2931.
Features
• Low Quiescent Current (60 mA @ 100 mA Load)
• 5.0 V ±2.0% Output
• 100 mA Output Current Capability
• Internally Fused Leads in SO−8 Package
• Fault Protection
− +74 V Peak Transient Voltage
− −15 V Reverse Voltage
− Short Circuit
− Thermal Shutdown
• Pb−Free Package is Available
© Semiconductor Components Industries, LLC, 2006
February, 2006 − Rev. 8
1
http://onsemi.com
8
1
SO−8
DF SUFFIX
CASE 751
123
D2PAK−3
DP SUFFIX
CASE 418AB
PIN CONNECTIONS AND
MARKING INDIAGRAM
1 SO−8 8
VOUT
VIN
GND
GND
GND
GND
NC NC
D2PAK−3
CS
8221
AWLYWWG
Tab = GND
Pin 1. VIN
2. GND
3. VOUT
1
CS8221 = Specific Device Code
A = Assembly Location
WL, L = Wafer Lot
Y = Year
WW, W = Work Week
G or G = Pb−Free Package
ORDERING INFORMATION*
Device
Package
Shipping†
CS8221YDF8
CS8221YDFR8
SO−8
SO−8
95 Units/Rail
2500/Tape & Reel
CS8221YDFR8G
CS8221YDP3
CS8221YDPR3
SO−8 2500/Tape & Reel
(Pb−Free)
D2PAK−3
50 Units/Rail
D2PAK−3 750/Tape & Reel
*Contact your local sales representative for TO−92
package option.
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specification
Brochure, BRD8011/D.
Publication Order Number:
CS8221/D
1 page  
CS8221
Once the minimum capacitor value with the maximum
ESR is found, a safety factor should be added to allow for the
tolerance of the capacitor and any variations in regulator
performance. Most good quality aluminum electrolytic
capacitors have a tolerance of ± 20% so the minimum value
found should be increased by at least 50% to allow for this
tolerance plus the variation which will occur at low
temperatures. The ESR of the capacitor should be less than
50% of the maximum allowable ESR found in step 3 above.
CALCULATING POWER DISSIPATION IN A SINGLE
OUTPUT LINEAR REGULATOR
The maximum power dissipation for a single output
regulator (Figure 5) is:
PD(max) + NJVIN(max) * VOUT(min)NjIOUT(max) ) VIN(max)IQ (1)
where:
VIN(max) is the maximum input voltage,
VOUT(min) is the minimum output voltage,
IOUT(max) is the maximum output current for the
application, and
IQ is the quiescent current the regulator consumes at
IOUT(max).
Once the value of PD(max) is known, the maximum
permissible value of RΘJA can be calculated:
RQJA
+
150°C *
PD
TA
(2)
The value of RΘJA can then be compared with those in the
package section of the data sheet. Those packages with
RΘJA’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.
IIN
VIN
CS8221
IOUT
VOUT
HEAT SINKS
A heat sink 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 RΘJA.
RQJA + RQJC ) RQCS ) RQSA
(3)
where:
RΘJC = the junction−to−case thermal resistance,
RΘCS = the case−to−heatsink thermal resistance, and
RΘSA = the heatsink−to−ambient thermal resistance.
RΘJC appears in the package section of the data sheet. Like
RΘJA, it too is a function of package type. RΘCS and RΘSA
are functions of the package type, heatsink and the interface
between them. These values appear in heat sink data sheets
of heat sink manufacturers.
IQ
Figure 5. Single Output Regulator With Key
Performance Parameters Labeled
http://onsemi.com
5
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet CS8221.PDF ] | |
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