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CS5205-3 데이터시트 PDF




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기능 Fixed Linear Regulators
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CS5205-3 데이터시트, 핀배열, 회로
CS5205−1, CS5205−3,
CS5205−5
5.0 A Adjustable, and
3.3 V and 5.0 V Fixed
Linear Regulators
The CS5205 x series of linear regulators provides 5.0 A at
adjustable and fixed voltages with an accuracy of ±1.0% and ±2.0%
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 CS5205x is pin compatible with the LT1084 family of linear
regulators but has lower dropout voltage.
The regulators are available in T O2203 and surface mount
D2PAK3 packages.
Features
Output Current to 5.0 A
Output Trimmed to ±1.0%
Dropout Voltage 1.2 V @ 5.0 A
Fast Transient Response
Fault Protection Circuitry
Thermal Shutdown
Overcurrent Protection
Safe Area Protection
VOUT
VIN
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TO2203
T SUFFIX
CASE 221A
Adjustable
Output
Tab = VOUT
Pin 1. Adj
2. VOUT
3. VIN
12 3
123
D2PAK3
DP SUFFIX
CASE 418AB
Fixed
Output
Tab = VOUT
Pin 1. GND
2. VOUT
3. VIN
MARKING DIAGRAMS
TO2203
D2PAK3
CS5205x
AWLYWW
CS5205x
AWLYWW
1
1
x = 1, 3, or 5
A = Assembly Location
WL, L = Wafer Lot
YY, Y = Year
WW, W = Work Week
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 7 of this data sheet.
Thermal
Shutdown
Bandgap
Output
Current
Limit
+ Error
Amplifier
Adj
Figure 1. Block Diagram CS52051
© Semiconductor Components Industries, LLC, 2006
September, 2006Rev. 8
1
Publication Order Number:
CS52051/D
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CS5205-3 pdf, 반도체, 판매, 대치품
CS52051, CS52053, CS52055
TYPICAL PERFORMANCE CHARACTERISTICS
1.30
1.25
1.20
1.15
1.10
1.05
1.00
0.95
0.90
0.85
0.80
0.75
0.70
0
TCASE = 0°C
TCASE = 25°C
TCASE = 125°C
12 3 4
Output Current (A)
Figure 3. Dropout Voltage vs. Output
Current
5
0.10
0.08
0.06
0.04
0.02
0.00
0.02
0.04
0.06
0.08
0.10
0.12
0
10 20 30 40 50 60 70 80 90 100 110 120 130
TJ (°C)
Figure 4. Reference Voltage vs.
Temperature
0.200
0.175
0.150
0.125
0.100
0.075
TCASE = 25°C
0.050
0.025
0.000
0
TCASE = 125°C
TCASE = 0°C
123
Output Current (A)
4
Figure 5. Load Regulation vs. Output
Current
5
2.500
2.175
1.850
1.525
1.200
0.875
0.550
1
TCASE = 0°C
TCASE = 25°C
TCASE = 125°C
2 3 4 5 6 789
VIN VOUT (V)
Figure 6. Minimum Load Current
70
IO = 10 mA
65
60
55
50
45
40
0 10 20 30 40 50 60 70 80 90 100 110 120 130
Temperature (°C)
Figure 7. Adjust Pin Current vs.
Temperature
100
90
80
70
60
50
40 TCASE = 25°C
30
IOUT = 5.0 A
(VIN VOUT) = 3.0 V
20 VRIPPLE = 1.6 VPP
10
0101
102 103 104
Frequency (Hz)
105
Figure 8. Ripple Rejection vs. Frequency
(Fixed Versions)
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CS5205-3 전자부품, 판매, 대치품
CS52051, CS52053, CS52055
Calculating Power Dissipation and Heat Sink
Requirements
The CS5205x series of linear regulators includes thermal
shutdown and current limit 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 temperatures accurately to
ensure that an adequate heat sink is used.
The case is connected to V OUT on the CS5205x,
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 TA (°C)
2. Power dissipation PD (Watts)
3. Maximum junction temperature TJ (°C)
4. Thermal resistance junction to ambient RqJA (°C/W)
These four are related by the equation
TJ + TA ) PD RQJA
(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:
VIN(max) is the maximum input voltage,
VOUT(min) is the minimum output voltage,
IOUT(max) is the maximum output current, for the
application
IQ is the maximum quiescent current at IOUT(max).
A heat sink ef fectively 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 qJA, the total thermal resistance between the
junction and the surrounding air.
1. Thermal Resistance of the junction to case, RqJC
(°C/W)
2. Thermal Resistance of the case to Heat Sink, RqCS
(°C/W)
3. Thermal Resistance of the Heat Sink to the ambient
air, RqSA (°C/W)
These are connected by the equation:
RQJA + RQJC ) RQCS ) RQSA
(3)
The value for RqJA is calculated using equation (3) and the
result can be substituted in equation (1).
The value for RqJC is 3.5°C/W for a given package type
based on an average die size. For a high current regulator
such as the CS5205x the majority of the heat is generated
in the power transistor section. The value for RqSA depends
on the heat sink type, while RqCS depends on factors such as
package type, heat sink interface (isan 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 RqJA 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
CS52051GT3
CS52051GDP3
CS52051GDPR3
5.0 A, Adj. Output
5.0 A, Adj. Output
5.0 A, Adj. Output
TO2203, STRAIGHT
D2PAK3
D2PAK3
50 Units / Rail
50 Units / Rail
750 / Tape & Reel
CS52053GT3
CS52053GDP3
CS52053GDPR3
5.0 A, 3.3 V Output
5.0 A, 3.3 V Output
5.0 A, 3.3 V Output
TO2203, STRAIGHT
D2PAK3
D2PAK3
50 Units / Rail
50 Units / Rail
750 / Tape & Reel
CS52055GT3
5.0 A, 5.0 V Output
TO2203, 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.
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