Semiconductor Components Industries, LLC, 2004
January, 2004 - Rev. 7
1
Publication Order Number:
CS5206/D
CS5206-1, CS5206-3,
CS5206-5
6.0 A Adjustable, and
Fixed 3.3 V and 5.0 V
Linear Regulators
The CS5206-X series of linear regulators provides 6.0 A at
adjustable and fixed voltages of 3.3 V and 5.0 V with an accuracy of
1% and
2% respectively. The adjustable version uses two external
resistors to set the output voltage within a 1.25 V to 13 V range.
The regulators are intended for use as post regulators and
microprocessor supplies. The fast loop response and low dropout
voltage make these regulators ideal for applications where low voltage
operation and good transient response are important.
The circuit is designed to operate with dropout voltages as low as
1.0 V depending on the output current level. The maximum quiescent
current is only 10 mA at full load.
The regulators are fully protected against overload conditions with
protection circuitry for Safe Operating Area (SOA), overcurrent and
thermal shutdown.
The regulators are available in TO-220-3 and surface mount
D
2
PAK-3 packages.
Features
Output Current to 6.0 A
Output Trimmed to
1%
Dropout Voltage 1.3 V @ 6.0 A
Fast Transient Response
Fault Protection Circuitry
-
Thermal Shutdown
-
Overcurrent Protection
-
Safe Area Protection
+
-
Thermal
Shutdown
Bandgap
Output
Current
Limit
Error
Amplifier
V
OUT
Adj
V
IN
Figure 1. Block Diagram - CS5206-1
TO-220-3
T SUFFIX
CASE 221A
Tab = V
OUT
Pin 1. Adj
2. V
OUT
3. V
IN
Adjustable
Output
Fixed
Output
Tab = V
OUT
Pin 1. GND
2. V
OUT
3. V
IN
MARKING DIAGRAMS
CS5206-x
AWLYWW
1
CS5206-x
AWLYWW
1
D
2
PAK-3
TO-220-3
x
= 1, 3, or 5
A
= Assembly Location
WL, L
= Wafer Lot
YY, Y
= Year
WW, W = Work Week
1
2
3
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D
2
PAK-3
DP SUFFIX
CASE 418AB
1
2
3
See detailed ordering and shipping information in the package
dimensions section on page 7 of this data sheet.
ORDERING INFORMATION
CS5206-1, CS5206-3, CS5206-5
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2
+
-
Thermal
Shutdown
Bandgap
Output
Current
Limit
Error
Amplifier
V
OUT
Gnd
V
IN
Figure 2. Block Diagram - CS5206-2, -3
MAXIMUM RATINGS*
Parameter
Value
Unit
Supply Voltage, V
CC
17
V
Operating Temperature Range
-40 to +70
C
Junction Temperature
150
C
Storage Temperature Range
-60 to +150
C
Lead Temperature Soldering:
Wave Solder (through hole styles only) Note 1
Reflow (SMD styles only) Note 2
260 Peak
230 Peak
C
1. 10 second maximum.
2. 60 second maximum above 183
C.
*The maximum package power dissipation must be observed.
ELECTRICAL CHARACTERISTICS
(C
IN
= 10
F, C
OUT
= 22
F, Tantalum, V
IN
- V
OUT
= 3.0 V, V
IN
15 V, 0
C
T
A
70
C,
T
J
= +150
C, unless otherwise specified, I
full load
= 6.0 A.)
Characteristic
Test Conditions
Min
Typ
Max
Unit
Adjustable Output Voltage (CS5206-1)
Reference Voltage (Notes 3 and 4)
V
IN
- V
OUT
= 1.5 V; V
Adj
= 0 V,
10 mA
I
OUT
6.0 A
1.241
(-1%)
1.254
1.266
(+1%)
V
Line Regulation
1.5 V
V
IN
- V
OUT
6.0 V; I
OUT
= 10 mA
0.04
0.20
%
Load Regulation (Notes 3 and 4)
V
IN
- V
OUT
= 1.5 V; 10 mA
I
OUT
6.0 A
0.1
0.4
%
Dropout Voltage (Note 5)
I
OUT
= 6.0 A
1.3
1.4
V
Current Limit
V
IN
- V
OUT
= 3.0 V; T
J
25
C
V
IN
- V
OUT
= 9.0 V
6.5
8.5
1.0
6.0
A
A
Minimum Load Current
V
IN
- V
OUT
= 7.0 V
1.2
100
mA
Adjust Pin Current
50
5.0
A
Adjust Pin Current Change
1.5 V
V
IN
- V
OUT
4.0 V;
10 mA
I
OUT
6.0 A
0.2
A
Thermal Regulation
30 ms pulse; T
A
= 25
C
0.003
%/W
3. Load regulation and output voltage are measured at a constant junction temperature by low duty cycle pulse testing. Changes in output
voltage due to thermal gradients or temperature changes must be taken into account separately.
4. Specifictions apply for an external Kelvin sense connection atr a point on the output pin 1/4" from the bottom of the package.
5. Dropout voltage is a measurement of the minimum input/output differentail at full load.
CS5206-1, CS5206-3, CS5206-5
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3
ELECTRICAL CHARACTERISTICS continued
(C
IN
= 10
F, C
OUT
= 22
F, Tantalum, V
IN
- V
OUT
= 3.0 V, V
IN
15 V,
0
C
T
A
70
C, T
J
= +150
C, unless otherwise specified, I
full load
= 6.0 A.)
Characteristic
Test Conditions
Min
Typ
Max
Unit
Adjustable Output Voltage (CS5206-1) continued
Ripple Rejection
f = 120 Hz; C
Adj
= 25
F; I
OUT
= 6.0 A
82
dB
Temperature Stability
0.5
%
RMS Output Noise
10 Hz
f
10 kHz; T
A
= 25
C
0.003
%V
OUT
Thermal Shutdown
150
180
C
Thermal Shutdown Hysteresis
25
C
ELECTRICAL CHARACTERISTICS
(C
IN
= 10
F, C
OUT
= 22
F, Tantalum, V
IN
- V
OUT
= 3.0 V, V
IN
10 V, 0
C
T
A
70
C,
T
J
= +150
C, unless otherwise specified, I
full load
= 6.0 A.)
Characteristic
Test Conditions
Min
Typ
Max
Unit
Fixed Output Voltage (CS5206-3, CS5206-5)
Reference Voltage (Notes 6 and 7)
CS5206-5
CS5206-3
V
IN
- V
OUT
= 1.5 V; V
Adj
= 0 V,
10 mA
I
OUT
6.0 A
4.9 (-2%)
3.234 (-2%)
5.0
3.3
5.1 (+2%)
3.366 (+2%)
V
Line Regulation
1.5 V
V
IN
- V
OUT
6.0 V; I
OUT
= 10 mA
0.04
0.20
%
Load Regulation (Notes 6 and 7)
V
IN
- V
OUT
= 1.5 V; 10 mA
I
OUT
6.0 A
0.1
0.4
%
Dropout Voltage (Note 8)
I
OUT
= 6.0 A
1.3
1.4
V
Current Limit
V
IN
- V
OUT
= 3.0 V; T
J
25
C
V
IN
- V
OUT
= 9.0 V
6.5
8.5
1.0
6.0
A
A
Quiescent Current
V
IN
9.0 V; I
OUT
= 10 mA
5.0
10
mA
Thermal Regulation
30 ms pulse; T
A
= 25
C
0.003
%/W
Ripple Rejection
f = 120 Hz; C
Adj
= 25
F; I
OUT
= 6.0 A
75
dB
Temperature Stability
0.5
%
RMS Output Noise (%V
OUT
)
10 Hz
f
10 kHz
0.003
%V
OUT
Thermal Shutdown
150
180
C
Thermal Shutdown Hysteresis
25
C
6. Load regulation and output voltage are measured at a constant junction temperature by low duty cycle pulse testing. Changes in output
voltage due to thermal gradients or temperature changes must be taken into account separately.
7. Specifictions apply for an external Kelvin sense connection atr a point on the output pin 1/4" from the bottom of the package.
8. Dropout voltage is a measurement of the minimum input/output differentail at full load.
PACKAGE PIN DESCRIPTION
Package Pin Number
CS5206-1
CS5206-3, CS5206-5
D
2
PAK-3
TO-220-3
D
2
PAK-3
TO-220-3
Pin Symbol
Function
1
1
N/A
N/A
Adj
Adjust pin (low side of the internal reference)
2
2
2
2
V
OUT
Regulated output voltage (case)
3
3
3
3
V
IN
Input voltage
N/A
N/A
1
1
Gnd
Ground connection
CS5206-1, CS5206-3, CS5206-5
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4
TYPICAL PERFORMANCE CHARACTERISTICS
0
1
2
3
4
5
6
Output Current (A)
Figure 3. Dropout Voltage vs. Output Current
Dropout
V
oltage (V)
1.4
1.3
1.2
1.1
1.0
0.9
0.8
0.7
T
CASE
= 125
C
T
CASE
= 25
C
T
CASE
= 0
C
0
T
J
(
C)
Figure 4. Reference Voltage vs. Temperature
Output
V
oltage Deviation (%)
0.10
0.08
0.04
0.00
-0.04
-0.08
-0.12
10 20
30 40 50 60 70 80 90 100 110 120 130
0
1
2
3
4
5
6
Output Current (A)
Figure 5. Load Regulation vs. Output Current
Output
V
oltage Deviation, (%)
0.200
0.175
0.150
0.125
0.100
0.075
0.050
0.025
0.000
T
CASE
= 125
C
T
CASE
= 25
C
T
CASE
= 0
C
1
V
IN
- V
OUT
(V)
Figure 6. Minimum Load Current
Minimum
Load Current (mA)
0.550
T
CASE
= 125
C
T
CASE
= 25
C
T
CASE
= 0
C
0.875
1.200
1.525
1.850
2.175
2.500
2
3
4
5
6
7
8
9
0
Temperature (
C)
Figure 7. Adjust Pin Current vs. Temperature
Adjust
Pin Current (
A)
40
45
50
55
60
65
70
20
40
60
80
100
120
I
O
= 10 mA
10
1
Frequency (Hz)
Figure 8. Ripple Rejection vs. Frequency
(Fixed Versions)
Ripple
Rejection (dB)
0
20
40
60
80
100
10
2
10
3
10
4
10
5
T
CASE
= 25
C
I
OUT
= 6.0 A
(V
IN
- V
OUT
= 3.0 V)
V
RIPPLE
= 1.6 V
PP
CS5206-1, CS5206-3, CS5206-5
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5
10
1
Frequency (Hz)
Figure 9. Ripple Rejection vs. Frequency
(Adjustable Version)
Ripple
Rejection (dB)
0
20
40
60
80
100
10
2
10
3
10
4
10
5
T
CASE
= 25
C
I
OUT
= 6.0 A
(V
IN
- V
OUT
= 3.0 V)
V
RIPPLE
= 1.6 V
PP
C
Adj
= 25
F
APPLICATIONS INFORMATION
The CS5206-X family of linear regulators provide fixed
or adjustable voltages at currents up to 6.0 A. The regulators
are protected against short circuit, and include thermal
shutdown and safe area protection (SOA) circuitry. The
SOA protection circuitry decreases the maximum available
output current as the input-output differential voltage
increases.
The CS5206-X has a composite PNP-NPN output
transistor and requires an output capacitor for stability. A
detailed procedure for selecting this capacitor is included in
the Stability Considerations section.
Adjustable Operation
The adjustable regulator (CS5206-1) has an output
voltage range of 1.25 V to 13 V. An external resistor divider
sets the output voltage as shown in Figure 10. The regulator
maintains a fixed 1.25 V (typical) reference between the
output pin and the adjust pin.
A resistor divider network R1 and R2 causes a fixed
current to flow to ground. This current creates a voltage
across R2 that adds to the 1.25 V across R1 and sets the
overall output voltage. The adjust pin current (typically
50
A) also flows through R2 and adds a small error that
should be taken into account if precise adjustment of V
OUT
is necessary.
The output voltage is set according to the formula:
VOUT
+
VREF
R1
)
R2
R1
)
IAdj
R2
The term I
Adj
R2 represents the error added by the adjust
pin current.
R1 is chosen so that the minimum load current is at least
10 mA. R1 and R2 should be the same type, e.g. metal film
for best tracking over temperature. The adjust pin is
bypassed to improve the transient response and ripple
rejection of the regulator.
C
Adj
I
Adj
Figure 10. Resistor Divider Scheme for the
Adjustable Version
V
REF
R
2
R
1
C
2
V
OUT
V
IN
C
1
V
IN
V
OUT
Adj
CS5206-1
Stability Considerations
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 is 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. However, when the circuit operates at low
temperatures, both the value and ESR of the capacitor will
vary considerably. The capacitor manufacturers data sheet
provides this information.
A 22
F tantalum capacitor will work for most
applications, but with high current regulators such as the
CS5206-1, CS5206-3, CS5206-5
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6
CS5206-X the transient response and stability improve with
higher values of capacitor. The majority of applications for
this regulator involve large changes in load current so the
output capacitor must supply the instantaneous load current.
The ESR of the output capacitor causes an immediate drop
in output voltage given by:
D
V
+ D
I
ESR
For microprocessor applications it is customary to use an
output capacitor network consisting of several tantalum and
ceramic capacitors in parallel. This reduces the overall ESR
and reduces the instantaneous output voltage drop under
load transient conditions. The output capacitor network
should be as close as possible to the load for the best results.
Protection Diodes
When large external capacitors are used with a linear
regulator it is sometimes necessary to add protection diodes.
If the input voltage of the regulator gets shorted, the output
capacitor will discharge into the output of the regulator. The
discharge current depends on the value of the capacitor, the
output voltage and the rate at which V
IN
drops. In the
CS5206-X family of linear regulators, the discharge path is
through a large junction and protection diodes are not
usually needed. If the regulator is used with large values of
output capacitance and the input voltage is instantaneously
shorted to ground, damage can occur. In this case, a diode
connected as shown in Figures 11 and 12 is recommended.
Figure 11. Protection Diode Scheme for Adjustable
Output Regulator
C
2
V
OUT
V
IN
C
1
V
IN
V
OUT
Adj
CS5206-1
IN4002 (optional)
C
Adj
R
1
R
2
Figure 12. Protection Diode Scheme for Fixed Output
Regulators
C
2
V
OUT
V
IN
C
1
V
IN
V
OUT
Gnd
CS5206-1
IN4002 (optional)
Output Voltage Sensing
Since the CS5206-X is a three terminal regulator, it is not
possible to provide true remote load sensing. Load
regulation is limited by the resistance of the conductors
connecting the regulator to the load. For best results the
fixed regulators should be connected as shown in Figure 13.
Figure 13. Conductor Parasitic Resistance can be
Minimized with the Above Grounding Scheme for
Fixed Output Regulators
V
IN
V
IN
V
OUT
Gnd
CS5206-X
Conductor Parasitic
Resistance
R
C
R
LOAD
For the adjustable regulator, the best load regulation
occurs when R1 is connected directly to the output pin of the
regulator as shown in Figure 14. If R1 is connected to the
load, R
C
is multiplied by the divider ratio and the effective
resistance between the regulator and the load becomes
RC
R1
)
R2
R1
where R
C
= conductor parasitic resistance.
Figure 14. Grounding Scheme for Adjustable Output
Regulator to Minimize Parasitics
V
IN
V
IN
V
OUT
Adj
CS5206-1
Conductor Parasitic
Resistance
R
1
R
LOAD
R
2
R
C
Calculating Power Dissipation and Heat Sink
Requirements
The CS5206-X series of linear regulators includes
thermal shutdown and safe operating area circuitry to
protect the device. High power regulators such as these
usually operate at high junction temperatures so it is
important to calculate the power dissipation and junction
CS5206-1, CS5206-3, CS5206-5
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7
temperatures accurately to ensure that an adequate heat sink
is used.
The case is connected to V
OUT
on the CS5206-X,
electrical isolation may be required for some applications.
Thermal compound should always be used with high current
regulators such as these.
The thermal characteristics of an IC depend on the
following four factors:
1.
Maximum Ambient Temperature T
A
(
C)
2.
Power dissipation P
D
(Watts)
3.
Maximum junction temperature T
J
(
C)
4.
Thermal resistance junction to ambient R
JA
(
C/W)
These four are related by the equation
TJ
+
TA
)
PD
R
Q
JA
(1)
The maximum ambient temperature and the power
dissipation are determined by the design while the
maximum junction temperature and the thermal resistance
depend on the manufacturer and the package type.
The maximum power dissipation for a regulator is:
PD(max)
+
{VIN(max)
*
VOUT(min)}IOUT(max)
)
VIN(max)IQ
(2)
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
I
Q
is the maximum quiescent current at I
OUT(max)
.
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 has a thermal resistance. Like series
electrical resistances, these resistances are summed to
determine R
JA
, the total thermal resistance between the
junction and the surrounding air.
1.
Thermal Resistance of the junction to case, R
JC
(
C/W)
2.
Thermal Resistance of the case to Heat Sink, R
CS
(
C/W)
3.
Thermal Resistance of the Heat Sink to the ambient
air, R
SA
(
C/W)
These are connected by the equation:
R
Q
JA
+
R
Q
JC
)
R
Q
CS
)
R
Q
SA
(3)
The value for R
JA
is calculated using equation (3) and
the result can be substituted in equation (1).
The value for R
JC
is normally quoted as a single figure
for a given package type based on an average die size. For
a high current regulator such as the CS5206-X the majority
of the heat is generated in the power transistor section. The
value for R
JSA
depends on the heat sink type, while R
JCS
depends on factors such as package type, heat sink interface
(is an insulator and thermal grease used?), and the contact
area between the heat sink and the package. Once these
calculations are complete, the maximum permissible value
of R
JA
can be calculated and the proper heat sink selected.
For further discussion on heat sink selection, see application
note "Thermal Management," document number
AND8036/D, available through the Literature Distribution
Center or via our website at http://onsemi.com.
ORDERING INFORMATION
Orderable Part Number
Type
Package
Shipping
CS5206-1GT3
6.0 A, Adj. Output
TO-220-3, Straight
50 Units/Rail
CS5206-1GDP3
6.0 A, Adj. Output
D
2
PAK-3
50 Units/Rail
CS5206-1GDPR3
6.0 A, Adj. Output
D
2
PAK-3
750 Tape & Reel
CS5206-3GT3
6.0 A, 3.3 V Output
TO-220-3, Straight
50 Units/Rail
CS5206-3GDP3
6.0 A, 3.3 V Output
D
2
PAK-3
50 Units/Rail
CS5206-3GDPR3
6.0 A, 3.3 V Output
D
2
PAK-3
750 Tape & Reel
CS5206-5GT3
6.0 A, 5.0 V Output
TO-220-3, Straight
50 Units/Rail
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.
CS5206-1, CS5206-3, CS5206-5
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8
PACKAGE DIMENSIONS
TO-220-3
T SUFFIX
CASE 221A-08
ISSUE AA
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
A
K
L
G
D
N
H
Q
F
1 2 3
4
-T-
SEATING
PLANE
S
R
J
U
T
C
3 PL
-B-
-Y-
M
B
M
0.25 (0.010)
Y
DIM
MIN
MAX
MIN
MAX
MILLIMETERS
INCHES
A
0.560
0.625
14.23
15.87
B
0.380
0.420
9.66
10.66
C
0.140
0.190
3.56
4.82
D
0.025
0.035
0.64
0.89
F
0.139
0.155
3.53
3.93
G
0.100 BSC
2.54 BSC
H
---
0.280
---
7.11
J
0.012
0.045
0.31
1.14
K
0.500
0.580
12.70
14.73
L
0.045
0.060
1.15
1.52
N
0.200 BSC
5.08 BSC
Q
0.100
0.135
2.54
3.42
R
0.080
0.115
2.04
2.92
S
0.020
0.055
0.51
1.39
T
0.235
0.255
5.97
6.47
U
0.000
0.050
0.00
1.27
V
V
0.045
---
1.15
---
CS5206-1, CS5206-3, CS5206-5
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9
PACKAGE DIMENSIONS
D
2
PAK-3
DP SUFFIX
CASE 418AB-01
ISSUE O
For D
2
PAK Outline and
Dimensions - Contact Factory
PACKAGE THERMAL DATA
Parameter
TO-220-3
D
2
PAK-3
Unit
R
JC
Typical
1.6
1.6
C/W
R
JA
Typical
50
10-50*
C/W
* Depending on thermal properties of substrate. R
JA
= R
JC
+ R
CA
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10
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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
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