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
2
PAK−3 packages.
D
Features
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Adjustable
Output
TO−220−3
T SUFFIX
CASE 221A
Tab = V
OUT
Pin 1. Adj
2. V
OUT
3. V
IN
Fixed
Output
D
2
PAK−3
DP SUFFIX
CASE 418AB
3
Tab = V
OUT
Pin 1. GND
2. V
OUT
3. V
IN
1
2
3
12
MARKING DIAGRAMS
TO−220−3
D
2
PAK−3
•
•
•
•
•
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
CS5206−x
AWLYWW
CS5206−x
AWLYWW
1
1
x
A
WL, L
YY, Y
WW, W
= 1, 3, or 5
= Assembly Location
= Wafer Lot
= Year
= Work Week
V
IN
V
OUT
ORDERING INFORMATION
Output
Current
Limit
Thermal
Shutdown
Bandgap
−
+
Error
Amplifier
Adj
See detailed ordering and shipping information in the package
dimensions section on page 7 of this data sheet.
Figure 1. Block Diagram
−
CS5206−1
©
Semiconductor Components Industries, LLC, 2006
September, 2006
−
Rev. 8
1
Publication Order Number:
CS5206/D
CS5206−1, CS5206−3, CS5206−5
V
OUT
V
IN
Output
Current
Limit
Thermal
Shutdown
−
+
Error
Amplifier
Bandgap
Gnd
Figure 2. Block Diagram
−
CS5206−2,
−3
MAXIMUM RATINGS*
Parameter
Supply Voltage, V
CC
Operating Temperature Range
Junction Temperature
Storage Temperature Range
Lead Temperature Soldering:
1. 10 second maximum.
2. 60 second maximum above 183°C.
*The maximum package power dissipation must be observed.
Wave Solder (through hole styles only) Note 1
Reflow (SMD styles only) Note 2
Value
17
−40
to +70
150
−60
to +150
260 Peak
230 Peak
Unit
V
°C
°C
°C
°C
T
J
= +150°C, unless otherwise specified, I
full load
= 6.0 A.)
Characteristic
Adjustable Output Voltage (CS5206−1)
Reference Voltage (Notes 3 and 4)
Line Regulation
Load Regulation (Notes 3 and 4)
Dropout Voltage (Note 5)
Current Limit
Minimum Load Current
Adjust Pin Current
Adjust Pin Current Change
Thermal Regulation
ELECTRICAL CHARACTERISTICS
(C
IN
= 10
μF,
C
OUT
= 22
μF,
Tantalum, V
IN
−
V
OUT
= 3.0 V, V
IN
≤
15 V, 0°C
≤
T
A
≤
70°C,
Test Conditions
Min
Typ
Max
Unit
V
IN
−
V
OUT
= 1.5 V; V
Adj
= 0 V,
10 mA
≤
I
OUT
≤
6.0 A
1.5 V
≤
V
IN
−
V
OUT
≤
6.0 V; I
OUT
= 10 mA
V
IN
−
V
OUT
= 1.5 V; 10 mA
≤
I
OUT
≤
6.0 A
I
OUT
= 6.0 A
V
IN
−
V
OUT
= 3.0 V; T
J
≥
25°C
V
IN
−
V
OUT
= 9.0 V
V
IN
−
V
OUT
= 7.0 V
1.241
(−1%)
1.254
0.04
0.1
1.3
1.266
(+1%)
0.20
0.4
1.4
6.0
100
5.0
V
%
%
V
A
A
mA
μA
μA
%/W
6.5
8.5
1.0
1.2
50
1.5 V
≤
V
IN
−
V
OUT
≤
4.0 V;
10 mA
≤
I
OUT
≤
6.0 A
30 ms pulse; T
A
= 25°C
0.2
0.003
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.
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2
CS5206−1, CS5206−3, CS5206−5
ELECTRICAL CHARACTERISTICS continued
(C
IN
= 10
μF,
C
OUT
= 22
μF,
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
Adjustable Output Voltage (CS5206−1) continued
Ripple Rejection
Temperature Stability
RMS Output Noise
Thermal Shutdown
Thermal Shutdown Hysteresis
10 Hz
≤
f
≤
10 kHz; T
A
= 25°C
150
f = 120 Hz; C
Adj
= 25
μF;
I
OUT
= 6.0 A
82
0.5
0.003
180
25
dB
%
%V
OUT
°C
°C
Test Conditions
Min
Typ
Max
Unit
T
J
= +150°C, unless otherwise specified, I
full load
= 6.0 A.)
Characteristic
Fixed Output Voltage (CS5206−3, CS5206−5)
Reference Voltage (Notes 6 and 7)
CS5206−5
CS5206−3
Line Regulation
Load Regulation (Notes 6 and 7)
Dropout Voltage (Note 8)
Current Limit
Quiescent Current
Thermal Regulation
Ripple Rejection
Temperature Stability
RMS Output Noise (%V
OUT
)
Thermal Shutdown
Thermal Shutdown Hysteresis
ELECTRICAL CHARACTERISTICS
(C
IN
= 10
μF,
C
OUT
= 22
μF,
Tantalum, V
IN
−
V
OUT
= 3.0 V, V
IN
≤
10 V, 0°C
≤
T
A
≤
70°C,
Test Conditions
Min
Typ
Max
Unit
V
V
IN
−
V
OUT
= 1.5 V; V
Adj
= 0 V,
10 mA
≤
I
OUT
≤
6.0 A
1.5 V
≤
V
IN
−
V
OUT
≤
6.0 V; I
OUT
= 10 mA
V
IN
−
V
OUT
= 1.5 V; 10 mA
≤
I
OUT
≤
6.0 A
I
OUT
= 6.0 A
V
IN
−
V
OUT
= 3.0 V; T
J
≥
25°C
V
IN
−
V
OUT
= 9.0 V
V
IN
≤
9.0 V; I
OUT
= 10 mA
30 ms pulse; T
A
= 25°C
f = 120 Hz; C
Adj
= 25
μF;
I
OUT
= 6.0 A
6.5
4.9 (−2%)
3.234 (−2%)
5.0
3.3
0.04
0.1
1.3
8.5
1.0
5.0
0.003
75
0.5
10 Hz
≤
f
≤
10 kHz
150
0.003
180
25
5.1 (+2%)
3.366 (+2%)
0.20
0.4
1.4
6.0
10
%
%
V
A
A
mA
%/W
dB
%
%V
OUT
°C
°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
D
2
PAK−3
1
2
3
N/A
TO−220−3
1
2
3
N/A
CS5206−3, CS5206−5
D
2
PAK−3
N/A
2
3
1
TO−220−3
N/A
2
3
1
Pin Symbol
Adj
V
OUT
V
IN
Gnd
Function
Adjust pin (low side of the internal reference)
Regulated output voltage (case)
Input voltage
Ground connection
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3
CS5206−1, CS5206−3, CS5206−5
TYPICAL PERFORMANCE CHARACTERISTICS
1.4
Output Voltage Deviation (%)
1.3
Dropout Voltage (V)
1.2
1.1
1.0
0.9
0.8
0.7
0
1
2
3
4
5
6
T
CASE
= 125°C
T
CASE
= 25°C
T
CASE
= 0°C
0.10
0.08
0.04
0.00
−0.04
−0.08
−0.12
0
10 20 30 40 50 60 70 80 90 100 110 120 130
T
J
(°C)
Output Current (A)
Figure 3. Dropout Voltage vs. Output Current
0.200
Output Voltage Deviation, (%)
Minimum Load Current (mA)
0.175
0.150
0.125
0.100
0.075
0.050
0.025
0.000
0
1
2
3
4
Output Current (A)
T
CASE
= 0°C
5
6
0.550
1
T
CASE
= 125°C
Figure 4. Reference Voltage vs. Temperature
2.500
2.175
T
CASE
= 0°C
1.850
1.525
1.200
0.875
T
CASE
= 25°C
T
CASE
= 125°C
4
5
6
V
IN
−
V
OUT
(V)
7
8
9
T
CASE
= 25°C
2
3
Figure 5. Load Regulation vs. Output Current
70
65
60
55
50
45
40
0
Ripple Rejection (dB)
I
O
= 10 mA
100
80
60
40
20
0
10
1
Figure 6. Minimum Load Current
Adjust Pin Current (μA)
T
CASE
= 25°C
I
OUT
= 6.0 A
(V
IN
−
V
OUT
= 3.0 V)
V
RIPPLE
= 1.6 V
PP
20
40
60
80
Temperature (°C)
100
120
10
2
10
3
Frequency (Hz)
10
4
10
5
Figure 7. Adjust Pin Current vs. Temperature
Figure 8. Ripple Rejection vs. Frequency
(Fixed Versions)
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4
CS5206−1, CS5206−3, CS5206−5
100
80
Ripple Rejection (dB)
60
40
20
0
10
1
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
μF
10
2
10
3
Frequency (Hz)
10
4
10
5
Figure 9. Ripple Rejection vs. Frequency
(Adjustable Version)
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
bypassed to improve the transient response and ripple
rejection of the regulator.
V
IN
C
1
V
IN
V
OUT
CS5206−1
Adj
V
REF
R
1
C
2
V
OUT
I
Adj
C
Adj
R
2
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
μA)
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
)
I
Adj
R1
R2
Figure 10. Resistor Divider Scheme for the
Adjustable Version
Stability Considerations
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
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
μF
tantalum capacitor will work for most
applications, but with high current regulators such as the
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