ETC CS8221/D

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 µA typical at 100 µA
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 µA @ 100 µA 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
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SO–8
DF SUFFIX
CASE 751
8
1
12
D2PAK
3–PIN
DP SUFFIX
CASE 418E
3
PIN CONNECTIONS AND
MARKING INDIAGRAM
VOUT
SO–8
1
8221
ALYW
GND
GND
8
NC
VIN
GND
GND
NC
D2PAK
CS8221
AWLYWW
Tab = GND
Pin 1. VIN
2. GND
3. VOUT
1
A
WL, L
YY, Y
WW, W
= Assembly Location
= Wafer Lot
= Year
= Work Week
ORDERING INFORMATION*
Device
Package
Shipping
CS8221YDF8
SO–8
95 Units/Rail
SO–8
2500 Tape & Reel
CS8221YDFR8
CS8221YDP3
D2PAK,
3–PIN
50 Units/Rail
CS8221YDPR3 D2PAK, 3–PIN 750 Tape & Reel
*Contact your local sales representative for TO–92
package option.
 Semiconductor Components Industries, LLC, 2001
March, 2001 – Rev. 5
1
Publication Order Number:
CS8221/D
CS8221
VOUT
VIN
Current Source
(Circuit Bias)
Over Voltage
Shutdown
Current Limit
Sense
+
–
Error
Amplifier
Thermal
Protection
GND
Bandgap
Reference
Figure 1. Block Diagram
ABSOLUTE MAXIMUM RATINGS*
Rating
Value
Unit
Junction Temperature Range, TJ
–40 to +150
°C
Storage Temperature Range, TSTORAGE
–55 to +150
°C
Internally Limited
–
–15, 74
V
–0.5 to 26
V
Internally Limited
–
2.0
kV
230 peak
°C
Power Dissipation
Peak Transient Voltage (60 V Load Dump @ VIN = 14 V)
Input Operating Range
Output Current
Electrostatic Discharge (Human Body Model)
Lead Temperature Soldering:
Reflow (Note 1.)
1. 60 seconds maximum above 183°.
*The maximum package power dissipation must be observed.
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CS8221
ELECTRICAL CHARACTERISTICS (6.0 ≤ VIN ≤ 26 V, IOUT = 1.0 mA, –40°C ≤ TJ ≤ 125°C unless otherwise noted.)
Characteristic
Test Conditions
Min
Typ
Max
Unit
Output Voltage, VOUT
9.0 V < VIN < 26 V, 100 µA ≤ IOUT ≤ 100 mA
6.0 V ≤ VIN ≤ 26 V, 100 µA ≤ IOUT ≤ 100 mA
4.9
4.85
5.0
5.0
5.1
5.15
V
V
Dropout Voltage (VIN – VOUT)
IOUT = 100 mA
IOUT = 100 µA
–
–
400
100
600
150
mV
mV
Load Regulation
VIN = 14 V, 100 µA ≤ IOUT ≤ 100 mA,
–
5.0
50
mV
Line Regulation
6.0 V < V < 26 V, IOUT = 1.0 mA
–
5.0
50
mV
Quiescent Current, (IQ)
IOUT = 100 µA, VIN = 6.0 V
IOUT = 50 mA
IOUT = 100 mA
–
–
–
60
4.0
12
120
6.0
20
µA
mA
mA
Ripple Rejection
7.0 ≤ VIN ≤ 17 V, IOUT = 100 mA, f = 120 Hz
60
75
–
dB
–
125
200
–
mA
40
125
–
µA
150
180
–
°C
30
34
38
V
Output Stage
Current Limit
Short Circuit Output Current
VOUT = 0 V
Thermal Shutdown (Note 2.)
Overvoltage Shutdown
–
VOUT ≤ 1.0 V
2. This parameter is guaranteed by design, but not parametrically tested in production.
PACKAGE LEAD DESCRIPTION
PACKAGE LEAD #
SO–8
D2PAK
LEAD SYMBOL
1
3
VOUT
5.0 V, ±2.0%, 100 mA Output.
2, 3, 6, 7
2
GND
Ground.
4
–
NC
No Connection.
5
–
NC
No Connection.
8
1
VIN
Input Voltage.
FUNCTION
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CS8221
CIRCUIT DESCRIPTION
VOLTAGE REFERENCE AND OUTPUT CIRCUITRY
Should the junction temperature of the power device
exceed 180°C (typ) the power transistor is turned off.
Thermal shutdown is an effective means to prevent die
overheating since the power transistor is the principle heat
source in the IC.
Output Stage Protection
The output stage is protected against overvoltage, short
circuit and thermal runaway conditions (Figure 2).
> 30 V
VOUT
VIN
C1 *
0.1 µF
VIN
CS8221
C2**
10 µF
VOUT
GND
IOUT
Load
Dump
Short
Circuit
*C1 is required if regulator is far from the power source filter.
Thermal
Shutdown
**C2 is required for stability.
Figure 2. Typical Circuit Waveforms for Output
Stage Protection
Figure 3. Application and Test Diagram
If the input voltage rises above 30 V, the output shuts
down. This response protects the internal circuitry and
enables the IC to survive unexpected voltage transients.
APPLICATION NOTES
STABILITY CONSIDERATIONS
Step 2: With the input voltage at its maximum value,
increase the load current slowly from zero to full load while
observing the output for any oscillations. If no oscillations
are observed, the capacitor is large enough to ensure a stable
design under steady state conditions.
Step 3: Increase the ESR of the capacitor from zero using
the decade box and vary the load current until oscillations
appear. Record the values of load current and ESR that cause
the greatest oscillation. This represents the worst case load
conditions for the regulator at low temperature.
Step 4: Maintain the worst case load conditions set in
step 3 and vary the input voltage until the oscillations
increase. This point represents the worst case input voltage
conditions.
Step 5: If the capacitor is adequate, repeat steps 3 and 4
with the next smaller valued capacitor. A smaller capacitor
will usually cost less and occupy less board space. If the
output oscillates within the range of expected operating
conditions, repeat steps 3 and 4 with the next larger standard
capacitor value.
Step 6: Test the load transient response by switching in
various loads at several frequencies to simulate its real
working environment. Vary the ESR to reduce ringing.
Step 7: Increase the temperature to your highest operating
temperature. Vary the load current as instructed in step 5 to
test for any oscillations.
The output or compensation capacitor helps determine
three main characteristics of a linear regulator: start–up
delay, load transient response and loop stability.
The capacitor value and type should be based on cost,
availability, size and temperature constraints. A tantalum or
aluminum electrolytic capacitor is best, since a film or
ceramic capacitor with almost zero ESR can cause
instability. The aluminum electrolytic capacitor is the least
expensive solution, but, if the circuit operates at low
temperatures (–25°C to –40°C), both the value and ESR of
the capacitor will vary considerably. The capacitor
manufacturers data sheet usually provides this information.
The value for the output capacitor COUT shown in Figure
3 should work for most applications, however it is not
necessarily the optimized solution.
To determine an acceptable value for COUT for a particular
application, start with a tantalum capacitor of the
recommended value and work towards a less expensive
alternative part.
Step 1: Place the completed circuit with a tantalum
capacitor of the recommended value in an environmental
chamber at the lowest specified operating temperature and
monitor the outputs with an oscilloscope. A decade box
connected in series with the capacitor will simulate the
higher ESR of an aluminum capacitor. Leave the decade box
outside the chamber, the small resistance added by the
longer leads is negligible.
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CS8221
HEAT SINKS
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.
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.
RJA RJC RCS RSA
CALCULATING POWER DISSIPATION IN A SINGLE
OUTPUT LINEAR REGULATOR
The maximum power dissipation for a single output
regulator (Figure 4) is:
PD(max) VIN(max) VOUT(min)IOUT(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:
RJA 150°C TA
PD
(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
IOUT
VIN
(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.
VOUT
CS8221
IQ
Figure 4. Single Output Regulator With Key
Performance Parameters Labeled
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CS8221
PACKAGE DIMENSIONS
SO–8
DF SUFFIX
CASE 751–07
ISSUE W
–X–
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: MILLIMETER.
3. DIMENSION A AND B DO NOT INCLUDE MOLD
PROTRUSION.
4. MAXIMUM MOLD PROTRUSION 0.15 (0.006) PER
SIDE.
5. DIMENSION D DOES NOT INCLUDE DAMBAR
PROTRUSION. ALLOWABLE DAMBAR
PROTRUSION SHALL BE 0.127 (0.005) TOTAL IN
EXCESS OF THE D DIMENSION AT MAXIMUM
MATERIAL CONDITION.
A
8
5
0.25 (0.010)
S
B
1
M
Y
M
4
K
–Y–
G
C
N
DIM
A
B
C
D
G
H
J
K
M
N
S
X 45 SEATING
PLANE
–Z–
0.10 (0.004)
H
M
D
0.25 (0.010)
Z Y
M
X
S
J
S
MILLIMETERS
MIN
MAX
4.80
5.00
3.80
4.00
1.35
1.75
0.33
0.51
1.27 BSC
0.10
0.25
0.19
0.25
0.40
1.27
0
8
0.25
0.50
5.80
6.20
INCHES
MIN
MAX
0.189
0.197
0.150
0.157
0.053
0.069
0.013
0.020
0.050 BSC
0.004
0.010
0.007
0.010
0.016
0.050
0
8
0.010
0.020
0.228
0.244
D2PAK
3–PIN
DP SUFFIX
CASE 418E–01
ISSUE O
–T– SEATING
PLANE
B
M
NOTES:
1. DIMENSIONS AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
C
E
4
DIM
A
B
C
D
E
F
G
H
J
K
L
M
N
A
1
2
3
K
F
G
D
0.13 (0.005)
M
3 PL
T B
H
L
INCHES
MIN
MAX
0.326
0.336
0.396
0.406
0.170
0.180
0.026
0.036
0.045
0.055
0.090
0.110
0.100 BSC
0.098
0.108
0.018
0.025
0.204
0.214
0.045
0.055
0.055
0.066
0.000
0.004
J
M
PACKAGE THERMAL DATA
SO–8
Parameter
D2PAK,
3–PIN
Unit
RΘJC
Typical
25
4.2
°C/W
RΘJA
Typical
110
10–50*
°C/W
* Depending on thermal properties of substrate. RθJA = RθJC = RθCA
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MILLIMETERS
MIN
MAX
8.28
8.53
10.05
10.31
4.31
4.57
0.66
0.91
1.14
1.40
2.29
2.79
2.54 BSC
2.49
2.74
0.46
0.64
5.18
5.44
1.14
1.40
1.40
1.68
0.00
0.10
CS8221
Notes
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CS8221
SMART REGULATOR is a registered trademark of Semiconductor Components Industries, LLC (SCILLC).
ON Semiconductor and
are trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes
without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular
purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability,
including without limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets and/or
specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be
validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights nor the rights of others.
SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications
intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or
death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold
SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable
attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim
alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer.
PUBLICATION ORDERING INFORMATION
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*Available from Germany, France, Italy, UK, Ireland
For additional information, please contact your local
Sales Representative.
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8
CS8221/D