Semiconductor Components Industries, LLC, 2004
May, 2004 - Rev. 12
1
Publication Order Number:
CS9202/D
CS9202
Micropower 3.3 V, 100 mA
Linear Regulator with
NOCAP
TM
The CS9202 is a precision 3.3 V, 100 mA voltage regulator with low
quiescent current (450
mA typ. @ 100 mA load). The 3.3 V output is
accurate within
2% and supplies 100 mA of load current.
The regulator is protected against reverse battery, short circuit, over
voltage, and over temperature conditions. The device can withstand
74 V peak transients making it suitable for use in automotive
environments. ON's proprietary NOCAP solution is the first
technology which allows the output to be stable without the use of an
external capacitor. NOCAP is suitable for slow switching or steady
loads.
Features
NOCAP
Low Quiescent Current (450
m
typ. @ 100
mA load)
3.3 V,
2% Output
100 mA Output Current Capability
Fault Protection
-
74 V Peak Transient Voltage
-
-15 V Reverse Voltage
-
Short Circuit
-
Thermal Shutdown
-
Overvoltage Shutdown
Internally Fused Leads
Current Source
(Circuit Bias)
Voltage
Shutdown
Over
NOCAP
Current Limit
Sense
Thermal
Shutdown
Bandgap
Reference
V
OUT
Sense
(1)
GND
V
IN
+
- Error
Amplifier
(1)
Contact factory for optional Sense lead.
Figure 1. Block Diagram
Device
Package
Shipping
ORDERING INFORMATION
CS9202YDF8
SO-8
98 Units/Rail
CS9202YDFR8
2500 Tape & Reel
SO-8
SO-8
DF SUFFIX
CASE 751
1
8
NC
NC
1
CS920
AL
YW2
8
GND
GND
GND
GND
V
IN
V
OUT
PIN CONNECTIONS AND
MARKING DIAGRAM
A
= Assembly Location
WL, L
= Wafer Lot
YY, Y
= Year
WW, W = Work Week
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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.
CS9202
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2
MAXIMUM RATINGS*
Parameter
Value
Unit
Power Dissipation
Internally Limited
-
Input Voltage (V
IN
):
DC
Peak Transient Voltage (60 V Load Dump @ V
IN
= 14 V)
-15 to 36
74
V
V
Output Current
Internally Limited
-
ESD Susceptibility (Human Body Model)
4.0
kV
Package Thermal Resistance:
Junction-to-Case, R
JC
Junction-to-Ambient, R
JA
25
110
C/W
C/W
Junction Temperature
-40 to +150
C
Storage Temperature
-55 to +150
C
Lead Temperature Soldering:
Reflow (SMD styles only) Note 1
230 Peak
C
1. 60 second maximum above 183
C.
*The maximum package power dissipation must be observed.
ELECTRICAL CHARACTERISTICS
(4.5 V
V
IN
26 V, I
OUT
= 1.0 mA, -40
C
T
J
125
C; unless otherwise stated.)
Parameter
Test Conditions
Min
Typ
Max
Unit
Output Stage
Output Voltage, V
OUT
9.0 V < V
IN
< 16 V, 100
m
A
I
OUT
100 mA
4.5 V < V
IN
< 26 V, 100
m
A
I
OUT
100 mA
3.234
3.201
3.300
3.300
3.366
3.399
V
V
Load Regulation
V
IN
= 14 V, 100
m
A
I
OUT
100 mA
-
5
50
mV
Line Regulation
4.5 V < V < 26 V, I
OUT
= 1.0 mA
-
5
50
mV
Quiescent Current, (I
Q
)
I
OUT
= 100
m
A, V
IN
= 12 V
I
OUT
50 mA
I
OUT
100 mA
-
450
4
12
750
6
20
m
A
mA
mA
Ripple Rejection
7.0 V
VI
N
17 V, I
OUT
= 100 mA, f = 120 Hz
60
75
-
dB
Current Limit
-
105
200
-
mA
Short Circuit Output Current
V
OUT
= 0 V
25
125
-
mA
Thermal Shutdown (Note 2)
-
150
180
-
C
Overvoltage Shutdown
V
OUT
1.0 V
28
32
36
V
2. This parameter is guaranteed by design, but not parametrically tested in production.
PACKAGE LEAD DESCRIPTION
Package Lead Number
SO-8
Lead Symbol
Function
1
V
OUT
3.3 V,
2%, 100 mA output.
2, 3, 6, 7
GND
Ground.
4, 5
NC
No connection.
8
V
IN
Input voltage.
CS9202
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3
TYPICAL PERFORMANCE CHARACTERISTICS
Figure 2. Load Regulation vs. Output
Current V
IN
= 14 V
Output Current (mA)
Load Regulation (mV)
14
100
Figure 3. Output Voltage vs. Temperature
V
IN
= 14 V
Temperature (
C)
Output V
oltage (V)
3.320
140
12
10
8
6
4
2
0
-2
90
80
70
60
50
40
30
20
10
0
-40
C
125
C
25
C
3.315
3.310
3.305
3.300
3.295
3.290
3.285
3.280
120
100
80
60
40
20
0
-20
-40
20 mA
100 mA
100
A
Figure 4. Line Regulation vs. Input
Voltage I
OUT
= 100
A
Input Voltage (V)
Line Regulation (mV)
8
26
Figure 5. Quiescent Current vs. Output
Current (Lightly Loaded) V
IN
= 14 V
Output Current (mA)
Quiescent Current (mA)
1
10
6
4
2
0
-2
-4
-6
-8
24
22
20
18
16
14
12
10
8
6
0.9
0.8
0.7
0.6
0.5
0.4
0.3
9
8
7
6
5
4
3
2
1
0
125
C
25
C
-40
C
-40
C
25
C
125
C
Figure 6. Quiescent Current vs. Output
Current V
IN
= 14 V
Output Current (mA)
Quiescent Current (mA)
12
100
Figure 7. Quiescent Current vs. Input
Voltage I
OUT
= 100
A
Input Voltage (V)
Quiescent Current (mA)
0.70
26
90
80
70
60
50
40
30
20
10
0
10
8
6
4
2
0
-40
C
25
C
125
C
0.65
0.60
0.55
0.50
0.45
0.40
0.35
0.30
24
22
20
18
16
14
12
10
8
6
4
125
C
25
C
-40
C
CS9202
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4
CIRCUIT DESCRIPTION
VOLTAGE REFERENCE AND OUTPUT
CIRCUITRY
Output Stage Protection
The output stage is protected against overvoltage, short
circuit and thermal runaway conditions (Figure 8).
If the input voltage rises above 32 V (typ), the output shuts
down. This response protects the internal circuitry and
enables the IC to survive unexpected voltage transients.
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.
Figure 8. Typical Circuit Waveforms for Output
Stage Protection
Load
Dump
Short
Circuit
Thermal
Shutdown
V
IN
V
OUT
I
OUT
> 32 V
GND
V
IN
V
OUT
CS9202
C
1
*
0.1
F
* C1 is required if regulator is distant from power source filter.
Figure 9. Application and Test Diagram
APPLICATION NOTES
STABILITY CONSIDERATIONS / NOCAP
Normally a linear regulator (with a slow lateral PNP in the
control loop) necessitates a large external compensation
capacitor at the output of the IC. The external capacitor is
also used to curtail offshoot, determine startup delay time
and load transient response.
Traditional regulators typically have low unity gain
bandwidth, display overshoot and poor ripple rejection.
Compensation is also an issue and depends on the external
capacitor value, ESR (Equivalent Series Resistance) and
board layout parasitics that all can create oscillations if not
properly accounted for.
NOCAP is an ON Semiconductor exclusive output stage
which internally compensates the regulator over
temperature,
load and line variations without the need for an
expensive external capacitor
NOCAP is ideally suited for slow switching or steady
loads. If the load is characterized by transient current events,
an output storage capacitor may be needed. If this is the case,
the capacitor should be no larger than 100 nF. With loads
that require greater transient suppression, a regulator with a
traditional output stage (such as the CS8221) may be better
suited for proper operation.
CS9202
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5
CALCULATING POWER DISSIPATION IN A
SINGLE OUTPUT LINEAR REGULATOR
The maximum power dissipation for a single output
regulator (Figure 10) is:
PD(max)
+
{VIN(max)
*
VOUT(min)} IOUT(max)
)
VIN(max)IQ
(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)
.
Once the value of P
D(max)
is known, the maximum
permissible value of R
JA
can be calculated:
R
Q
JA
+
150
C
*
TA
PD
(2)
Figure 10. Single output regulator with key
performance parameters labeled.
I
IN
I
OUT
I
Q
CS9202
V
OUT
V
IN
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.
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 R
JA
:
R
Q
JA
+
R
Q
JC
)
R
Q
CS
)
R
Q
SA
(3)
where:
R
JC
= the junction-to-case thermal resistance,
R
CS
= the case-to-heatsink thermal resistance, and
R
SA
= the heatsink-to-ambient 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 heat sink
data sheets of heat sink manufacturers.
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