ONSEMI CS5253-1

CS5253−1
3.0 A LDO 5−Pin Adjustable
Linear Regulator
This new very low dropout linear regulator reduces total power
dissipation in the application. To achieve very low dropout, the
internal pass transistor is powered separately from the control
circuitry. Furthermore, with the control and power inputs tied together,
this device can be used in single supply configuration and still offer a
better dropout voltage than conventional PNP − NPN based LDO
regulators. In this mode the dropout is determined by the minimum
control voltage.
The CS5253−1 is offered in a five−terminal D2PAK−5 package,
which allows for the implementation of a remote−sense pin permitting
very accurate regulation of output voltage directly at the load, where it
counts, rather than at the regulator. This remote sensing feature
virtually eliminates output voltage variations due to load changes and
resistive voltage drops. Typical load regulation measured at the sense
pin is less than 1.0 mV for an output voltage of 2.5 V with a load step
of 10 mA to 3.0 A.
The CS5253−1 has a very fast transient loop response which can be
adjusted using a small capacitor on the Adjust pin.
Internal protection circuitry provides for “bust−proof” operation,
similar to three−terminal regulators. This circuitry, which includes
overcurrent, short circuit, and over−temperature protection will self
protect the regulator under all fault conditions.
The CS5253−1 is ideal for generating a 2.5 V supply to power
graphics controllers used on VGA cards.
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1
5
D2PAK−5
DP SUFFIX
CASE 936AC
MARKING DIAGRAM
CS
5253−1
AWLYWWG
1
Features
•
•
•
•
•
•
•
•
•
•
•
•
•
Tab = VOUT
Pin 1. VSENSE
2. Adjust
3. VOUT
4. VCONTROL
5. VPOWER
VOUT Range Is 1.25 V to 5.0 V @ 3.0 A
VPOWER Dropout < 0.40 V @ 3.0 A
VCONTROL Dropout < 1.05 V @ 3.0 A
1.0% Trimmed Reference
Fast Transient Response
Remote Voltage Sensing
Thermal Shutdown
Current Limit
Short Circuit Protection
Drop−In Replacement for EZ1582
Backwards Compatible with 3−Pin Regulators
Very Low Dropout Reduces Total Power Consumption
Pb−Free Package is Available*
CS5253−1
A
WL
Y
WW
G
= Device Code
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Package
ORDERING INFORMATION
Package
Shipping†
CS5253−1GDP5
D2PAK−5
50 Units/Rail
CS5253−1GDPR5
D2PAK−5
750/Tape & Reel
CS5253−1GDPR5G
D2PAK−5
(Pb−Free)
750/Tape & Reel
Device
†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.
*For additional information on our Pb−Free strategy and soldering details, please
download the ON Semiconductor Soldering and Mounting Techniques
Reference Manual, SOLDERRM/D.
© Semiconductor Components Industries, LLC, 2006
September, 2006− Rev. 11
1
Publication Order Number:
CS5253−1/D
CS5253−1
5.0 V
VCONTROL
VOUT
CS5253−1
2.5 V @ 3.0 A
VPOWER
3.3 V
VSENSE
124
1.0%
Adjust
10 mF
10 V
124
1.0%
100 mF
5.0 V
300 mF
5.0 V
Load
Figure 1. Application Diagram
MAXIMUM RATINGS
Rating
Value
Unit
VPOWER Input Voltage
6.0
V
VCONTROL Input Voltage
13
V
0 to 150
°C
−65 to +150
°C
2.0
kV
230 peak
°C
Operating Junction Temperature Range, TJ
Storage Temperature Range
ESD Damage Threshold
Lead Temperature Soldering:
Reflow: (SMD styles only) (Note 1)
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
1. 60 second maximum above 183°C.
ELECTRICAL CHARACTERISTICS (0°C ≤ TA ≤ 70°C; 0°C ≤ TJ ≤ 150°C; VSENSE = VOUT and VADJ = 0 V; unless otherwise specified.)
Characteristic
Test Conditions
Min
Typ
Max
Unit
Reference Voltage
VCONTROL = 2.75 V to 12 V, VPOWER = 2.05 V to 5.5 V,
IOUT = 10 mA to 3.0 A
1.237
(−1.0%)
1.250
1.263
(+1.0%)
V
Line Regulation
VCONTROL = 2.5 V to 12 V, VPOWER = 1.75 V to 5.5 V,
IOUT = 10 mA
−
0.02
0.2
%
Load Regulation
VCONTROL = 2.75 V, VPOWER = 2.05 V,
IOUT = 10 mA to 3.0 A, with Remote Sense
−
0.04
0.3
%
Minimum Load Current (Note 2)
VCONTROL = 5.0 V, VPOWER = 3.3 V, DVOUT = +1.0%
−
5.0
10
mA
Control Pin Current (Note 3)
VCONTROL = 2.75 V, VPOWER = 2.05 V, IOUT = 100 mA
VCONTROL = 2.75 V, VPOWER = 2.05 V, IOUT = 3.0 A
−
−
6.0
35
10
120
mA
mA
Adjust Pin Current
VCONTROL = 2.75 V, VPOWER = 2.05 V, IOUT = 10 mA
−
60
120
mA
VCONTROL = 2.75 V, VPOWER = 2.05 V, DVOUT = −1.0%
3.1
4.0
−
A
VCONTROL = 2.75 V, VPOWER = 2.05 V, VOUT = 0 V
2.0
3.5
−
A
CS5253−1
Current Limit
Short Circuit Current
2. The minimum load current is the minimum current required to maintain regulation. Normally the current in the resistor divider used to set
the output voltage is selected to meet the minimum load current requirement.
3. The VCONTROL pin current is the drive current required for the output transistor. This current will track output current with roughly a 1:100
ratio. The minimum value is equal to the quiescent current of the device.
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2
CS5253−1
ELECTRICAL CHARACTERISTICS (0°C ≤ TA ≤ 70°C; 0°C ≤ TJ ≤ 150°C; VSENSE = VOUT and VADJ = 0 V; unless otherwise specified.)
Characteristic
Test Conditions
Min
Typ
Max
Unit
VCONTROL = VPOWER = 3.25 V, VRIPPLE = 1.0 VP−P @
120 Hz, IOUT = 4.0 A, CADJ = 0.1 mF
60
80
−
dB
30 ms Pulse, TA = 25°C
−
0.002
−
%/W
VPOWER = 2.05 V, IOUT = 100 mA
VPOWER = 2.05 V, IOUT = 1.0 A
VPOWER = 2.05 V, IOUT = 3.0 A
−
−
−
0.90
1.00
1.05
1.15
1.15
1.30
V
V
V
VPOWER Dropout Voltage
(Minimum VPOWER − VOUT)
(Note 5)
VCONTROL = 2.75 V, IOUT = 100 mA
VCONTROL = 2.75 V, IOUT = 1.0 A
VCONTROL = 2.75 V, IOUT = 3.0 A
−
−
−
0.05
0.15
0.40
0.15
0.25
0.60
V
V
V
RMS Output Noise
Freq = 10 Hz to 10 kHz, TA = 25°C
−
0.003
−
%VO
CS5253−1
Ripple Rejection (Note 4)
Thermal Regulation
VCONTROL Dropout Voltage
(Minimum VCONTROL − VOUT)
(Note 5)
UT
Temperature Stability
−
0.5
−
−
%
Thermal Shutdown (Note 6)
−
150
180
210
°C
Thermal Shutdown Hysteresis
−
−
25
−
°C
VCONTROL Supply Only Output Current
VCONTROL = 13 V, VPOWER Not Connected,
VADJ = VOUT = VSENSE = 0 V
−
−
50
mA
VPOWER Supply Only Output Current
VPOWER = 6.0 V, VCONTROL Not Connected,
VADJ = VOUT = VSENSE = 0 V
−
0.1
1.0
mA
4. This parameter is guaranteed by design and is not 100% production tested.
5. Dropout is defined as either the minimum control voltage (VCONTROL) or minimum power voltage (VPOWER) to output voltage differential
required to maintain 1.0% regulation at a particular load current.
6. This parameter is guaranteed by design, but not parametrically tested in production. However, a 100% thermal shutdown functional test
is performed on each part.
PACKAGE PIN DESCRIPTION
PIN #
PIN SYMBOL
FUNCTION
1
VSENSE
This Kelvin sense pin allows for remote sensing of the output voltage at the load for improved regulation. It
is internally connected to the positive input of the voltage sensing error amplifier.
2
Adjust
This pin is connected to the low side of the internally trimmed 1.0% bandgap reference voltage and carries
a bias current of about 50 mA. A resistor divider from Adjust to VOUT and from Adjust to ground sets the
output voltage. Also, transient response can be improved by adding a small bypass capacitor from this pin
to ground.
3
VOUT
This pin is connected to the emitter of the power pass transistor and provides a regulated voltage capable
of sourcing 3.0 A of current.
4
VCONTROL
This is the supply voltage for the regulator control circuitry. For the device to regulate, this voltage should
be between 0.9 V and 1.3 V (depending on the output current) greater than the output voltage. The control
pin current will be about 1.0% of the output current.
5
VPOWER
This is the power input voltage. This pin is physically connected to the collector of the power pass transistor.
For the device to regulate, this voltage should be between 0.1 V and 0.6 V greater than the output voltage
depending on the output current. The output load current of 3.0 A is supplied through this pin.
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3
CS5253−1
VPOWER
VCONTROL
BIAS
and
TSD
−
+
VREF
EA
IA
+
−
VOUT
VSENSE
Adjust
Figure 2. Block Diagram
0.12
1.252
0.10
Load Regulation (%)
1.253
1.251
1.250
1.249
1.248
1.247
TJ = 120°C
0.08
0.06
TJ = 20°C
0.04
TJ = 0°C
0.02
0
20
40
60
80
100
0
120
0
0.5
Junction Temperature (°C)
1.0
1.5
2.0
2.5
3.0
Output Current (A)
Figure 3. Reference Voltage vs Junction Temperature
Figure 4. Load Regulation vs Output Current
5.0
VCONTROL = 5.0 V
VPOWER = 3.3 V
VOUT = 2.5 V
CCONTROL = 10 mF
CPOWER = 100 mF
CADJ = 0.1 mF
COUT = 300 mF
Measured at DVOUT = −1.0%
4.5
4.0
VOUT
Output Current (A)
Reference Voltage (V)
TYPICAL PERFORMANCE CHARACTERISTICS
3.5
3.0
2.5
2.0
1.5
1.0
ILOAD,
10 mA to 3.0 A
0.5
0
0
1
2
3
4
5
VPOWER − VOUT (V)
Figure 5. Transient Response
Figure 6. Output Current vs VPOWER − VOUT
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4
6
CS5253−1
85
Minimum Load Current (mA)
1200
IADJ (mA)
80
75
70
65
VPOWER = 3.3 V
DVOUT = +1.0%
1150
1100
1050
1000
950
900
850
60
0
20
40
60
80
100
120
800
1.0
140
2.0
3.0
Junction Temperature (°C)
VCONTROL = 2.75 V
VPOWER = 2.05 V
8.0
9.0
10
11
Ripple Rejection (dB)
80
3.7
3.6
3.5
3.4
70
60
50
VIN − VOUT = 2.0 V
IOUT = 4.0 A
VRIPPLE = 1.0 VP−P
COUT = 22 mF
CADJ = 0.1 mF
40
30
20
0
20
40
60
80
100
120
140
10
101
102
103
104
105
106
Frequency (Hz)
Junction Temperature (°C)
Figure 9. Short Circuit Output Current vs Junction
Temperature
Figure 10. Ripple Rejection vs Frequency
1100
12
VCONTROL Dropout Voltage (mV)
VCONTROL = 13 V
VOUT = 0 V
VPOWER Not Connected
10
8
IOUT (mA)
7.0
90
3.8
6
4
2
0
6.0
Figure 8. Minimum Load Current vs VCONTROL − VOUT
3.9
Short Circuit Output current Limit (A)
5.0
VCONTROL − VOUT (V)
Figure 7. Adjust Pin Current vs Junction Temperature
3.3
4.0
0
20
40
60
80
100
120
140
VPOWER = 2.05 V
TJ = 0°C
1000
TJ = 20°C
900
TJ = 120°C
800
0
0.5
1.0
1.5
2.0
2.5
Output Current (A)
Junction Temperature (°C)
Figure 11. VCONTROL Only Output Current vs Junction
Temperature
Figure 12. VCONTROL Dropout Voltage vs Output
Current
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5
3.0
500
916.4
450
916.3
400
Minimum Load Current (mA)
VPOWER Dropout Voltage (V)
CS5253−1
TJ = 120°C
350
300
TJ = 0°C
250
200
TJ = 20°C
150
100
50
0
VCONTROL = 5.0 V
DVOUT = +1.0%
916.2
916.1
916.0
915.9
915.8
915.7
915.6
915.5
0
0.5
1.0
1.5
2.0
2.5
915.4
0.5
3.0
1.5
2.5
VPOWER − VOUT (V)
Output Current (A)
Figure 13. VPOWER Dropout Voltage vs Output
Current
40
VPOWER = 6.0 V
VOUT = 0 V
VCONTROL Not Connected
ICONTROL (mA)
20
IOUT (mA)
4.5
Figure 14. Minimum Load Current vs VPOWER − VOUT
30
25
3.5
15
10
35
VCONTROL = 2.75 V
VPOWER = 2.05 V
30
IOUT = 3.0 A
25
20
15
IOUT = 1.0 A
10
5
0
IOUT = 100 mA
5
0
20
40
80
60
100
120
0
140
0
20
Junction Temperature (°C)
60
80
100
120 140
Junction Temperature (°C)
Figure 15. VPOWER Only Output Current vs Junction
Temperature
Figure 16. VCONTROL Supply Current vs Junction
Temperature
5.0
6
VPOWER = 3.3 V
VCONTROL = 5.0 V
VOUT = 2.5 V
TA = 25°C
VPOWER = 3.3 V
VCONTROL = 5.0 V
ILOAD = 0 to 3.0 A
5
VOUT = 2.5 V
VOUT Shorted to VSENSE
TJ = 0°C to 150°C
4
4.5
ESR (W)
Current Limit (A)
40
Unstable
3
2
4.0
Stable Region
1
3.5
0
0.5
1.0
1.5
2.0
2.5
3.0
0
0
VOUT (V)
10
20
30
40
50
60
70
Capacitance (mF)
Figure 17. Current Limit vs VOUT
Figure 18. Stability vs ESR
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80
90 100
CS5253−1
APPLICATIONS NOTES
A resistor divider network R1 and R2 causes a fixed current
The CS5253−1 linear regulator provides adjustable
to flow to ground. This current creates a voltage across R2
voltages from 1.26 V to 5.0 V at currents up to 3.0 A. The
that adds to the 1.260 V across R1 and sets the overall output
regulator is protected against short circuits, and includes a
voltage. The adjust pin current (typically 50 mA) also flows
thermal shutdown circuit with hysteresis. The output, which
through R2 and adds a small error that should be taken into
is current limited, consists of a PNP−NPN transistor pair and
account if precise adjustment of VOUT is necessary. The
requires an output capacitor for stability. A detailed procedure
output voltage is set according to the formula:
for selecting this capacitor is included in the Stability
R1 ) R2
VOUT + 1.260 V
) R2 IADJ
R1
Considerations section.
The term IADJ × R2 represents the error added by the adjust
VPOWER Function
pin current. R1 is chosen so that the minimum load current is
The CS5253−1 utilizes a two supply approach to maximize
at least 10 mA. R1 and R2 should be of the same composition
efficiency. The collector of the power device is brought out
for best tracking over temperature. The divider resistors
to the VPOWER pin to minimize internal power dissipation
should be placed physically as close to the load as possible.
under high current loads. VCONTROL provides for the control
While not required, a bypass capacitor connected between
circuitry and the drive for the output NPN transistor.
the
adjust pin and ground will improve transient response and
VCONTROL should be at least 1.0 V greater than the output
ripple
rejection. A 0.1 mF tantalum capacitor is recommended
voltage. Special care has been taken to ensure that there are
for
“first
cut” design. Value and type may be varied to
no supply sequencing problems. The output voltage will not
optimize
performance
vs. price.
turn on until both supplies are operating. If the control voltage
Other
Adjustable
Operation
Considerations
comes up first, the output current will be limited to about three
The
CS5253−1
linear
regulator
has an absolute maximum
milliamperes until the power input voltage comes up. If the
specification
of
6.0
V
for
the
voltage
difference between
power input voltage comes up first, the output will not turn on
V
and
V
.
However,
the
IC
may
be used to regulate
POWER
OUT
at all until the control voltage comes up. The output can never
voltages in excess of 6.0 V. The two main considerations in
come up unregulated.
such a design are the sequencing of power supplies and short
The CS5253−1 can also be used as a single supply device with
circuit capability.
the control and power inputs tied together. In this mode, the
Power supply sequencing should be such that the
dropout will be determined by the minimum control voltage.
V
supply is brought up coincidentally with or before
CONTROL
Output Voltage Sensing
the
V
supply. This allows the IC to begin charging the
POWER
The CS5253−1 five terminal linear regulator includes a
output capacitor as soon as the VPOWER to VOUT differential
dedicated VSENSE function. This allows for true Kelvin
is large enough that the pass transistor conducts. As VPOWER
sensing of the output voltage. This feature can virtually
increases, the pass transistor will remain in dropout, and
eliminate errors in the output voltage due to load regulation.
current is passed to the load until VOUT is in regulation.
Regulation will be optimized at the point where the sense pin
Further increase in the supply voltage brings the pass
is tied to the output.
transistor out of dropout. In this manner, any output voltage
DESIGN GUIDELINES
less than 13 V may be regulated, provided the VPOWER to
Adjustable Operation
VOUT differential is less than 6.0 V. In the case where
This LDO adjustable regulator has an output voltage range
VCONTROL and VPOWER are shorted, there is no theoretical
of 1.26 V to 5.0 V. An external resistor divider sets the output
limit to the regulated voltage as long as the VPOWER to VOUT
voltage as shown in Figure 19. The regulator’s voltage
differential of 6.0 V is not exceeded.
sensing error amplifier maintains a fixed 1.260 V reference
There is a possibility of damaging the IC when
between the output pin and the adjust pin.
VPOWER − VOUT is greater than 6.0 V if a short circuit
5.0 V
occurs. Short circuit conditions will result in the immediate
VCONTROL
VOUT
operation of the pass transistor outside of its safe operating
area. Overvoltage stresses will then cause destruction of the
2.5 V
CS5253−1
pass transistor before overcurrent or thermal shutdown
@ 3.0 A
3.3 V
circuitry can become active. Additional circuitry may be
VPOWER
VSENSE
required to clamp the VPOWER to VOUT differential to less
Adjust
R1
than 6.0 V if fail safe operation is required. One possible
clamp circuit is illustrated in Figure 20; however, the design
of clamp circuitry must be done on an application by
R2
application basis. Care must be taken to ensure the clamp
actually protects the design. Components used in the clamp
Figure 19. Typical Application Schematic.
design must be able to withstand the short circuit condition
The Resistor Divider Sets VOUT, With the Internal
indefinitely while protecting the IC.
1.260 V Reference Dropped Across R1.
THEORY OF OPERATION
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7
CS5253−1
External Supply
where T is the time for the regulation loop to begin to respond.
The very fast transient response time of the CS5253−1 allows
the ESR effect to dominate. 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 transient response.
External
Supply
VCONTROL
VSENSE
CS5253−1
VPOWER
VOUT
VADJ
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 VCONTROL drops. In the
CS5253−1 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 21 is recommended.
Figure 20. This Circuit Is an Example of How the
CS5253−1 Can Be Short−Circuit Protected When
Operating With VOUT > 6.0 V
Stability Considerations
The output compensation capacitor helps determine three
main characteristics of a linear regulator: loop stability, startup
delay, and load transient response. Different capacitor types
vary widely in tolerance, Equivalent Series Resistance (ESR),
Equivalent Series Inductance (ESI), and variation over
temperature. Tantalum and aluminum electrolytic capacitors
work best, with electrolytic capacitors being less expensive in
general, but varying more in capacitor value and ESR over
temperature.
The CS5253−1 requires an output capacitor to guarantee
loop stability. The Stability vs ESR graph in the typical
performance section shows the minimum ESR needed to
guarantee stability, but under ideal conditions. These include:
having VOUT connected to VSENSE directly at the IC pins; the
compensation capacitor located right at the pins with a
minimum lead length; the adjust feedback resistor divider
ground, (bottom of R2 in Figure 19), connected right at the
capacitor ground; and with power supply decoupling
capacitors located close to the IC pins. The actual
performance will vary greatly with board layout for each
application. In particular, the use of the remote sensing feature
will require a larger capacitor with less ESR. For most
applications, a minimum of 33 mF tantalum or 150 mF
aluminum electrolytic, with an ESR less than 1.0 W over
temperature, is recommended. Larger capacitors and lower
ESR will improve stability.
The load transient response, during the time it takes the
regulator to respond, is also determined by the output
capacitor. For large changes in load current, the ESR of the
output capacitor causes an immediate drop in output voltage
given by:
DV + DI
ESR
DV + DI
TńC
VCONTROL
VOUT
CS5253−1
VPOWER
VSENSE
Adjust
Figure 21. Diode Protection Circuit
A rule of thumb useful in determining if a protection diode
is required is to solve for current:
I+C
T
V
where:
I is the current flow out of the load capacitance when
VCONTROL is shorted,
C is the value of load capacitance
V is the output voltage, and
T is the time duration required for VCONTROL to transition
from high to being shorted.
If the calculated current is greater than or equal to the
typical short circuit current value provided in the
specifications, serious thought should be given to the use of
a protection diode.
There is then an additional drop in output voltage given
by:
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CS5253−1
Current Limit
maximum junction temperature and the thermal resistance
depend on the manufacturer and the package type. The
maximum power dissipation for a regulator is:
The internal current limit circuit limits the output current
under excessive load conditions.
Short Circuit Protection
PD(max) + (VIN(max) * VOUT(min))IOUT(max)
) VIN(max) Iq
The device includes short circuit protection circuitry that
clamps the output current at approximately 500 mA less than
its current limit value. This provides for a current foldback
function, which reduces power dissipation under a direct
shorted load.
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 which is measured in degrees per watt. Like series
electrical resistances, these thermal resistances are summed
to determine the total thermal resistance between the die
junction and the surrounding air, RqJA. This total thermal
resistance is comprised of three components. These resistive
terms are measured from junction to case (RqJC), case to heat
sink (RqCS), and heat sink to ambient air (RqSA). The
equation is:
Thermal Shutdown
The thermal shutdown circuitry is guaranteed by design to
activate above a die junction temperature of approximately
150°C and to shut down the regulator output. This circuitry
has 25°C of typical hysteresis, thereby allowing the
regulator to recover from a thermal fault automatically.
Calculating Power Dissipation and Heat Sink
Requirements
High power regulators such as the CS5253−1 usually
operate at high junction temperatures. Therefore, it is
important to calculate the power dissipation and junction
temperatures accurately to ensure that an adequate heat sink
is used. Since the package tab is connected to VOUT on the
CS5253−1, electrical isolation may be required for some
applications. Also, as with all high power packages, thermal
compound in necessary to ensure proper heat flow. For
added safety, this high current LDO includes an internal
thermal shutdown circuit
The thermal characteristics of an IC depend on the
following four factors: junction temperature, ambient
temperature, die power dissipation, and the thermal
resistance from the die junction−to−ambient air. The
maximum junction temperature can be determined by:
TJ(max) + TA(max) ) PD(max)
RqJA + RqJC ) RqCS ) RqSA
The value for RqJC is 2.5°C/watt for the CS5253−1 in the
D2PAK−5 package. For a high current regulator such as the
CS5253−1 the majority of heat is generated in the power
transistor section. The value for RqSA depends on the heat
sink type, while the RqCS 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 RqJA can be calculated and
the proper heat sink selected. For further discussion on heat
sink selection, see our application note “Thermal
Management,” document number AND8036/D, available
through the Literature Distribution Center or via our website
at http://www.onsemi.com.
RqJA
The maximum ambient temperature and the power
dissipation are determined by the design while the
http://onsemi.com
9
CS5253−1
PACKAGE DIMENSIONS
D2PAK−5
DP SUFFIX
CASE 936AC−01
ISSUE O
A
TERMINAL 6
E
NOTES:
1. DIMENSIONS AND TOLERANCING PER
ANSI Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
3. PACKAGE OUTLINE EXCLUSIVE OF
MOLD FLASH AND METAL BURR.
4. PACKAGE OUTLINE INCLUSIVE OF
PLATING THICKNESS.
5. FOOT LENGTH MEASURED AT
INTERCEPT POINT BETWEEN DATUM A
AND LEAD SURFACE.
U
K
S
V
B
M
H
L
W
DIM
A
B
C
D
E
G
H
K
L
M
N
P
R
S
U
V
W
P
G
N
R
D
−A−
C
INCHES
MIN
MAX
0.396
0.406
0.330
0.340
0.170
0.180
0.026
0.036
0.045
0.055
0.067 REF
0.580
0.620
0.055
0.066
0.000
0.010
0.098
0.108
0.017
0.023
0.090
0.110
0_
8_
0.095
0.105
0.30 REF
0.305 REF
0.010
MILLIMETERS
MIN
MAX
10.05
10.31
8.38
8.64
4.31
4.57
0.66
0.91
1.14
1.40
1.70 REF
14.73
15.75
1.40
1.68
0.00
0.25
2.49
2.74
0.43
0.58
2.29
2.79
0_
8_
2.41
2.67
7.62 REF
7.75 REF
0.25
PACKAGE THERMAL DATA
Parameter
D2PAK−5
Unit
RqJC
Typical
2.5
°C/W
RqJA
Typical
10−50*
°C/W
*Depending on thermal properties of substrate. RqJA = RqJC + RqCA.
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CS5253−1/D