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CS5205−2
5.0 A, 1.5 V Fixed Linear
Regulator
The CS5205−2 linear regulator provides 5.0 A @ 1.5 V with an
accuracy of
±2.0%.
The regulator is intended for use as an active termination for the
GTL bus on Intel based motherboards. 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 regulator is fully protected against overload conditions with
protection circuitry for Safe Operating Area (SOA), overcurrent and
thermal shutdown.
The CS5205−2 is available in TO−220−3 and surface mount D
2
PAK−3
packages.
Features
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TO−220−3
T SUFFIX
CASE 221A
1
2
3
D
2
PAK−3
D2T SUFFIX
CASE 418AB
Tab = V
OUT
Pin 1. GND
2. V
OUT
3. V
IN
•
•
•
•
•
Output Current to 5.0 A
Output Voltage Trimmed to
±2.0%
Dropout Voltage 1.2 V @ 5.0 A
Fast Transient Response
Fault Protection Circuitry
−
Thermal Shutdown
−
Overcurrent Protection
−
Safe Area Protection
12
3
MARKING DIAGRAMS
TO−220−3
D
2
PAK−3
CS5205−2
AWLYWW
CS5205−2
AWLYWW
1
V
OUT
1
A
WL, L
YY, Y
WW, W
= Assembly Location
= Wafer Lot
= Year
= Work Week
V
IN
Output
Current
Limit
Thermal
Shutdown
−
+
Error
Amplifier
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 5 of this data sheet.
Bandgap
GND
Figure 1. Block Diagram
©
Semiconductor Components Industries, LLC, 2006
September, 2006
−
Rev. 9
1
Publication Order Number:
CS5205−2/D
CS5205−2
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
°C
ELECTRICAL CHARACTERISTICS
(C
IN
= 10
mF,
C
OUT
= 22
mF
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
= 5.0 A)
Characteristic
Fixed Output Voltage
Output Voltage (Notes 3 and 4)
Line Regulation
Load Regulation (Notes 3 and 4)
Dropout Voltage (Note 5)
Current Limit
Quiescent Current
Thermal Regulation
Ripple Rejection
Temperature Stability
RMS Output Noise (%V
OUT
)
Thermal Shutdown
Thermal Shutdown Hysteresis
10 Hz
≤
f
≤
10 kHz
−
−
V
IN
−
V
OUT
= 1.5 V;
0
≤
I
OUT
≤
5.0 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
≤
5.0 A
I
OUT
= 5.0 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; I
OUT
= 5.0 A
−
1.47
(−2.0%)
−
−
−
5.5
−
−
−
−
−
−
150
−
1.50
0.04
0.08
1.2
8.5
1.0
5.0
0.003
75
0.5
0.003
180
25
1.53
(+2.0%)
0.20
0.40
1.3
−
−
10
−
−
−
−
−
−
V
%
%
V
A
A
mA
%/W
dB
%
%/V
OUT
°C
°C
Test Conditions
Min
Typ
Max
Unit
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. Specifications apply for an external Kelvin sense connection at 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 differential at full load.
PACKAGE PIN DESCRIPTION
Package Pin Number
TO−220−3
1
2
3
D
2
PAK−3
1
2
3
Pin Symbol
GND
V
OUT
V
IN
Ground connection.
Regulated output voltage (case).
Input voltage.
Function
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2
CS5205−2
TYPICAL PERFORMANCE CHARACTERISTICS
1.30
1.25
Output Voltage Deviation (%)
5
0.10
0.08
0.06
0.04
0.02
0.00
−0.02
−0.04
−0.06
−0.08
−0.10
0
1
2
3
4
Dropout Voltage (V)
1.20
1.15
1.10
1.05
1.00
0.95
0.90
0.85
0.80
0.75
0.70
T
CASE
= 125°C
T
CASE
= 25°C
T
CASE
= 0°C
−0.12
0
10 20 30 40 50 60 70 80 90 100 110 120 130
Output Current (A)
T
J
(°C)
Figure 2. 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
T
CASE
= 125°C
T
CASE
= 0°C
1
2
3
4
5
T
CASE
= 25°C
Figure 3. Reference Voltage vs.
Temperature
2.500
2.175
T
CASE
= 0°C
1.850
1.525
T
CASE
= 25°C
1.200
0.875
0.550
T
CASE
= 125°C
1
2
3
4
5
6
7
8
9
Output Current (A)
V
IN
−
V
OUT
(V)
Figure 4. Load Regulation vs.
Output Current
100
90
80
Ripple Rejection (dB)
70
60
50
40
30
20
10
0
10
1
10
2
10
3
T
CASE
= 25°C
Figure 5. Minimum Load Current
I
OUT
= 5.0 A
(V
IN
−
V
OUT
) = 3.0 V
V
RIPPLE
= 1.6 V
PP
10
4
10
5
Frequency (Hz)
Figure 6. Ripple Rejection vs. Frequency
(Fixed Versions)
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3
CS5205−2
APPLICATIONS INFORMATION
The regulator is protected against short circuit, and
includes thermal shutdown and safe area protection (SOA)
circuitry. The SOA protection circuitry decreases the
maximum available output current as the input−output
differential voltage increase.
The CS5205−2 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.
Stability Considerations
Protection Diodes
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 manufacturer’s data sheet
provides this information.
A 22
mF
tantalum capacitor will work for most
applications, but with high current regulators such as the
CS5205−2 the transient response and stability improve with
higher values of capacitance. 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:
DV
+
DI
ESR
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
CS5205−2 linear regulator, 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 Figure 7 is recommended.
IN4002 (Optional)
V
IN
C
1
V
OUT
V
IN
V
OUT
CS5205−2
GND
C
2
Figure 7. Protection Diode Scheme for Fixed
Output Regulators
Output Voltage Sensing
Since the CS5205−2 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
regulator should be connected as shown in Figure 8.
Conductor Parasitic
Resistance
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
transient load conditions. The output capacitor network
should be as close to the load as possible for the best results.
V
IN
V
IN
V
OUT
CS5205−2
R
C
R
LOAD
Figure 8. Conductor Parasitic Resistance Effects
Can Be Minimized With the Above Grounding
Scheme for Fixed Output Regulators
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