MIL-PRF-38534 AND 38535 CERTIFIED FACILITY
DUAL POSITIVE/NEGATIVE,
3 AMP, LOW DROPOUT
FIXED VOLTAGE REGULATORS
FEATURES:
Dual Low Dropout Voltage
Internal Short Circuit Current Limit
Output Voltages Are Internally Set To ±1% Max
Electrically Isolated Case
Internal Thermal Overload Protection
Many Output Voltage Combinations
Alternate Package and Lead Form Configurations Available
Equivalent Rad Hard Device MSK5930RH Series
5000
SERIES
DESCRIPTION:
The MSK5000 Series offers low dropout voltages on both the positive and negative regulators. This, combined with the
low
θ
JC,
allows increased output current while providing exceptional device efficiency. Because of the increased efficiency,
a small hermetic 5 pin package can be used providing maximum performance while occupying minimal board space. Output
voltages are internally trimmed to ±1% maximum resulting in consistent and accurate operation. Additionally, both regulators
offer internal short circuit current and thermal limiting, which allows circuit protection and eliminates the need for external
components and excessive derating.
EQUIVALENT SCHEMATIC
TYPICAL APPLICATIONS
High Efficiency Linear Regulators
Constant Voltage/Current Regulators
System Power Supplies
Switching Power Supply Post Regulators
PIN-OUT INFORMATION
1
2
3
4
5
+VIN
+VOUT
GND
-VIN
-VOUT
CASE=ISOLATED
1
8548-81 Rev. K 2/15
ABSOLUTE MAXIMUM RATINGS
±VIN
P
D
I
OUT
T
J
Input Voltage (WRT VOUT)
Power Dissipation
Output Current
Junction Temperature
9
±30V
Internally Limited
±3A
+150°C
T
ST
T
LD
T
C
ELECTRICAL SPECIFICATIONS
Parameter
POSITIVE OUTPUT REGULATORS:
Output Voltage Tolerance
Dropout Voltage
Load Regulation
Line Regulation
Quiescent Current
Short Circuit Current
Ripple Rejection
Thermal Resistance
2
2
2
2
Storage Temperature Range
10
Lead Temperature Range
(10 Seconds)
Case Operating Temperature
MSK5000-5009
MSK5000B-5009B
ESD Rating
-65°C to +150°C
300°C
-40°C to +85°C
-55°C to +125°C
Class 2
Test Conditions
3
Group A
Subgroup
1
2,3
1
1
2,3
1
2,3
1,2,3
-
-
-
1
2,3
1
1
2,3
1
2,3
1,2,3
-
-
-
MSK5000B SERIES
Min.
-
-
-
-
-
-
-
-
3.2
60
-
-
-
-
-
-
-
-
-
3.0
60
-
Typ.
0.1
0.1
1.3
0.2
0.3
0.1
0.2
10
4
75
4.3
0.1
0.1
0.8
0.2
0.3
.1
.2
4.5
3.5
75
4.5
Max.
1.0
2.0
1.5
1
2
0.5
.75
15
-
-
4.5
1.0
2.0
1.2
1
2
.5
.75
10
-
-
4.7
MSK5000 SERIES
Min.
-
-
-
-
-
-
-
-
3.0
60
-
-
-
-
-
-
-
-
-
3.0
60
-
Typ.
0.1
-
1.3
0.2
-
0.1
-
10
4
75
4.3
0.1
-
0.8
0.2
-
.1
-
4.5
3.5
75
4.5
Max.
2.0
-
1.6
2
-
0.6
-
15
-
-
4.6
2.0
-
1.3
2
-
.6
-
10
-
-
4.8
Units
I
OUT
=0A; VIN=VOUT+3V
0A≤I
OUT
≤3A; ∆VOUT=50mV
100mA≤I
OUT
≤3A
VIN=VOUT+3V
I
OUT
=0A
(VOUT+3V)≤VIN≤(VOUT+15V)
VIN=VOUT+3V; I
OUT
=0A
VIN=VOUT+5V
I
OUT
=3A; C
OUT
=25µF; f=120Hz
JUNCTION TO CASE @ Tc=125°C
8
%
%
V
%
%
%
%
mA
A
dB
°C/W
%
%
V
%
%
%
%
mA
A
dB
°C/W
NEGATIVE OUTPUT REGULATORS:
Output Voltage Tolerance
Dropout Voltage
Load Regulation
Line Regulation
Quiescent Current
Short Circuit Current
Ripple Rejection
Thermal Resistance
2
2
2
2
I
OUT
=0A; VIN=VOUT+3V
0A≤I
OUT
≤3A; ∆VOUT=50mV
VIN=VOUT+3V
100mA≤I
OUT
≤3A
I
OUT
=0A
(VOUT+3V)≤VIN≤(VOUT+15V)
VIN=VOUT+3V; I
OUT
=0A
VIN=VOUT+5V
I
OUT
=3A; C
OUT
=25µF; f=120Hz
JUNCTION TO CASE @ Tc=125°C
NOTES:
1
Outputs are 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 T
J
= T
C
.
4
Industrial 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 T
A
=T
C
=+25°C
Subgroup 2 T
A
=T
C
=+125°C
Subgroup 3 T
A
=T
C
=-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.
10
Internal solder reflow temperature is 180°C, do not exceed.
PART
7
OUTPUT VOLTAGES
NUMBER POSITIVE NEGATIVE
MSK5000
MSK5001
MSK5002
MSK5003
MSK5004
MSK5005
MSK5006
MSK5007
MSK5008
MSK5009
2
+3.3V
+5.0V
+5.0V
+12.0V
+12.0V
+15.0V
+15.0V
+5.0V
+5.0V
+10.0V
-5.2V
-5.0V
-5.2V
-5.0V
-12.0V
-15.0V
-5.0V
-12.0V
-15.0V
-10.0V
8548-81 Rev. K 2/15
APPLICATION NOTES
BYPASS CAPACITORS
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 oscil-
lations 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.
OVERLOAD SHUTDOWN
The regulators feature both power and thermal overload protec-
tion. When the maximum power dissipation is not exceeded, the
regulators will current limit slightly above their 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 am-
bient temperature, improper heat sinking etc., the regulators also
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
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 2 for connection diagram.
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.
Governing Equation: Tj = Pd x (R
θ
jc + R
θ
cs + R
θ
sa) + Ta
WHERE
Tj = Junction Temperature
Pd = Total Power Dissipation
R
θ
jc = Junction to Case Thermal Resistance
R
θ
cs = Case to Heat Sink Thermal Resistance
R
θ
sa = Heat Sink to Ambient Thermal Resistance
Tc = Case Temperature
Ta = Ambient Temperature
Ts = Heat Sink Temperature
EXAMPLE:
This example demonstrates an analysis where each regulator is
at one-half of its maximum rated power dissipation, which occurs
when the output currents are at 1.5 amps each.
Conditions for MSK5002:
VIN = ±7.0V; Iout = ±1.5A
1.) Assume 45° heat spreading model.
2.) Find positive regulator power dissipation:
FIGURE 1
Pd = (VIN - VOUT)(Iout)
Pd = (7-5)(1.5)
= 3.0W
3.) For conservative design, set Tj = +125°C Max.
4.) For this example, worst case Ta = +90°C.
5.) R
θ
jc = 4.5°C/W from the Electrical Specification Table.
6.) R
θ
cs = 0.15°C/W for most thermal greases.
7.) Rearrange governing equation to solve for R
θ
sa:
R
θ
sa = ((Tj - Ta)/Pd) - (R
θ
jc) - (R
θ
cs)
= (125°C - 90°C)/3.0W - 4.5°C/W - 0.15°C/W
= 7.0°C/W
The same exercise must be performed for the negative regulator. In
this case the result is 7.0°C/W. Therefore, a heat sink with a thermal
resistance of no more than 7.0°C/W must be used in this application
to maintain both regulator circuit junction temperatures under 125°C.
FIGURE 2
3
8548-81 Rev. K 2/15
MSK5002 TYPICAL APPLICATION:
Low Dropout Positive and Negative Power Supply
Avoiding Ground Loops
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