ISO-9001 CERTIFIED BY DSCC
M.S.KENNEDY CORP.
NEGATIVE, 3 AMP,
LOW DROPOUT
VOLTAGE REGULATOR
4707 Dey Road Liverpool, N.Y. 13088
5330
SERIES
(315) 701-6751
MIL-PRF-38534 CERTIFIED
FEATURES:
-5V, -5.2V, -10V, -12V and -15V Standard Versions
Low Dropout Voltage
Output Current to 3 Amps
Output Voltage Internally Set to ±1% MAX.
Internal Short Circuit Current Limit
Internal Thermal Overload Protection
Hermetic Surface Mount Package
Alternate Output Voltages Available
DESCRIPTION:
The MSK 5330 is a fixed, negative voltage regulator which offers low dropout and output voltage accuracy to ±1%
maximum. The low θjc combined with low dropout allows increased output current and excellent device efficiency. The
MSK 5330 offers both internal current limit and thermal overload protection. The device is packaged in a space efficient 3
pin power surface mount ceramic package.
EQUIVALENT SCHEMATIC
TYPICAL APPLICATIONS
PIN-OUT INFORMATION
High Efficiency Linear Regulators
Constant Voltage/Current Regulators
System Power Supplies
Switching Power Supply Post Regulators
1 GND
2 VOUT
3 VIN
1
Rev. B 10/05
9
ABSOLUTE MAXIMUM RATINGS
-VIN
PD
IOUT
TJ
Input Voltage (WRT VOUT)
Power Dissipation
Output Current
Junction Temperature
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-30V
Internally Limited
-3A
+175°C
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TST
TLD
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TC
Storage Temperature Range
Lead Temperature Range
(10 Seconds)
Case Operating Temperature
MSK 5330H/E
MSK 5330
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-65°C to +150°C
300°C
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-55°C to +125°C
-40°C to +85°C
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ELECTRICAL SPECIFICATIONS
MSK 5330H/E
Group A
Parameter
Test Conditions
Subgroup Min.
Output Voltage Tolerance
Dropout Voltage 2
Load Regulation
Line Regulation
Quiescent Current
Short Circuit Current 2
Ripple Rejection
2
Thermal Resistance 2
Thermal Shutdown
MSK 5330
3
Max.
Min.
Typ.
Max.
0.1
2.0
%
1
-
0.1
1.0
-
0.1
2.0
IOUT=10mA; VIN=VOUT+3V
Units
Typ.
2,3
-
-
-
-
%
0A≤IOUT ≤3A; ∆V OUT=1%
1
-
0.8
1.2
-
0.8
1.3
V
100mA≤IOUT≤3A
1
-
0.2
1.0
-
0.2
2.0
%
VIN=VOUT+3V
2,3
-
0.3
2.0
-
-
-
%
0.1
0.5
IOUT=10mA
1
-
-
0.1
0.6
%
(VOUT+3V)≤V IN≤(VOUT +15V)
2,3
-
0.2
0.75
-
-
-
%
VIN=V OUT+3V; IOUT=0A
1,2,3
-
4.5
10
-
4.5
10
mA
VIN=VOUT+5V
-
3.3
3.6
-
3.0
3.6
-
A
IOUT=3A; COUT=25µF; f=120Hz
-
60
75
-
60
75
-
dB
JUNCTION TO CASE @ 125°C
-
-
4.2
4.6
-
4.2
5.0
°C/W
TJ
-
-
150
-
-
150
-
°C
PART 7
NUMBER
NOTES:
OUTPUT VOLTAGE
MSK5330-5.0
-5.0V
MSK5330-5.2
-5.2V
MSK5330-10
-10.0V
MSK5330-12
-12.0V
MSK5330-15
-15.0V
1 Output is decoupled to ground using 33µF minimum, low ESR capacitors unless otherwise specified.
2 Guaranteed by design but not tested. Typical parameters are representative of actual device
performance but are for reference only.
3 All output parameters are tested using a low duty cycle pulse to maintain TJ = TC.
4 Industrial grade and "E" suffix devices shall be tested to subgroup 1 unless otherwise specified.
5 Military grade devices ("H" suffix) shall be 100% tested to subgroups 1,2 and 3.
6 Subgroup 1 TA=TC=+25°C
2 TA=TC=+125°C
3 TA=TC=-55°C
7 Please consult the factory if alternate output voltages are required.
8 Input voltage (VIN= VOUT + a specified voltage) is implied to be more negative than VOUT.
9 Continuous operation at or above absolute maximum ratings may adversely effect the device performance
and/or life cycle
2
Rev. B 10/05
APPLICATION NOTES
BYPASS CAPACITORS
OVERLOAD SHUTDOWN
For most applications a 33uF minimum, low ESR (0.5-2 ohm)
tantalum capacitor should be attached as close to the regulator's
output as possible. This will effectively lower the regulator's
output impedance, increase transient response and eliminate any
oscillations that are normally associated with low dropout regulators. Additional bypass capacitors can be used at the remote
load locations to further improve regulation. These can be either
of the tantalum or the electrolytic variety. Unless the regulator
is located very close to the power supply filter capacitor(s), a
4.7uF minimum low ESR (0.5-2 ohm) tantalum capacitor should
also be added to the regulator's input. An electrolytic may also
be substituted if desired. When substituting electrolytic in place
of tantalum capacitors, a good rule of thumb to follow is to
increase the size of the electrolytic by a factor of 10 over the
tantalum value.
The MSK 5330 features both power and thermal overload
protection. When the maximum power dissipation is not exceeded, the regulator will current limit slightly above its 3 amp
rating. As the Vin-Vout voltage increases, however, shutdown
occurs in relation to the maximum power dissipation curve. If
the device heats enough to exceed its rated die junction temperature due to excessive ambient temperature, improper heat
sinking etc., the regulator will shutdown until an appropriate
junction temperature is maintained. It should also be noted that
in the case of an extreme overload, such as a sustained direct
short, the device may not be able to recover. In these instances,
the device must be shut off and power reapplied to eliminate the
shutdown condition.
HEAT SINKING
To determine if a heat sink is required for your application
and if so, what type, refer to the thermal model and governing equation below.
LOAD REGULATION
For best results the ground pin should be connected directly
to the load as shown below, this effectively reduces the ground
loop effect and eliminates excessive voltage drop in the sense
leg. It is also important to keep the output connection between
the regulator and the load as short as possible since this directly
affects the load regulation. For example, if 20 gauge wire were
used which has a resistance of about .008 ohms per foot, this
would result in a drop of 8mV/ft at 1Amp of load current. It is
also important to follow the capacitor selection guidelines to
achieve best performance. Refer to Figure 1 for connection diagram.
Governing Equation: Tj = Pd x (Rθjc + Rθcs + Rθsa) + Ta
MSK 5330 TYPICAL APPLICATION:
WHERE
Tj = Junction Temperature
Pd = Total Power Dissipation
Rθjc = Junction to Case Thermal Resistance
Rθcs = Case to Heat Sink Thermal Resistance
Rθsa = Heat Sink to Ambient Thermal Resistance
Tc = Case Temperature
Ta = Ambient Temperature
Ts = Heat Sink Temperature
Low Dropout Negative Power Supply
EXAMPLE:
This example demonstrates an analysis where the regulator is at
one-half of its maximum rated power dissipation, which occurs
when the output current is at 1.5 amps.
Conditions for MSK 5330-5:
Vin = -7.0V; Iout = -1.5A
1.) Assume 45° heat spreading model.
2.) Find regulator power dissipation:
Pd = (Vin - Vout)(Iout)
Pd = (-7-(-5))(-1.5)
= 3.0W
FIGURE 1
3.) For conservative design, set Tj = +125°C Max.
4.) For this example, worst case Ta = +90°C.
5.) Rθjc = 4.6°C/W from the Electrical Specification Table.
6.) Rθcs = 0.15°C/W for most thermal greases.
7.) Rearrange governing equation to solve for Rθsa:
Rθsa= ((Tj - Ta)/Pd) - (Rθjc) - (Rθcs)
= (125°C - 90°C)/3.0W - 4.6°C/W - 0.15°C/W
= 6.9°C/W
In this case the result is 6.9°C/W. Therefore, a heat sink with a
thermal resistance of no more than 6.9°C/W must be used in
this application to maintain the regulator junction temperature
under 125°C.
3
Rev. B 10/05
TYPICAL PERFORMANCE CURVES
4
Rev. B 10/05
MECHANICAL SPECIFICATIONS
NOTE: ALL DIMENSIONS ARE ±0.010 INCHES UNLESS OTHERWISE LABELED.
ORDERING INFORMATION
MSK5330-5.0 H
SCREENING
BLANK= INDUSTRIAL; E= EXTENDED RELIABILITY;
H= MIL-PRF-38534, CLASS H
OUTPUT VOLTAGE
5.0=-5.0V, 5.2=-5.2V, 10=-10.0V, 12=-12.0V, 15=-15.0V
GENERAL PART NUMBER
The above example is a -5.0V, Military regulator.
M.S. Kennedy Corp.
4707 Dey Road, Liverpool, New York 13088
Phone (315) 701-6751
FAX (315) 701-6752
www.mskennedy.com
The information contained herein is believed to be accurate at the time of printing. MSK reserves the right to make
changes to its products or specifications without notice, however, and assumes no liability for the use of its products.
Please visit our website for the most recent revision of this datasheet.
5
Rev. B 10/05