MIL-PRF-38534 AND 38535 CERTIFIED FACILITY
RAD HARD
1.5A, NEGATIVE
ADJUSTABLE
LINEAR REGULATOR
5973RH
FEATURES:
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•
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Manufactured using
Space Qualified RH 137 Die
Radiation Hardened to 100 Krads(Si) (Method 1019.7 Condition A)
Output Current Limit
Internal Thermal Overload Protection
Output Current to 1.5 Amps
Adjustable Output using two External Resistors
Available in 3 Lead Form Options: Straight, Up and Down (TO-257)
Available to DSCC SMD 5962R09214
Equivalent Non Rad Hard Device MSK5173
SMD-1
3 PAD
CERAMIC
TO-257
DESCRIPTION:
The MSK5973RH is a radiation hardened 3-terminal negative adjustable regulator capable of supplying up to 1.5A of current.
The output is adjustable using external resistors for a range of Vref to -27V. Excellent line and load regulation characteristics
ensure accurate performance. The MSK5973RH has full protection with current and thermal limiting. The MSK5973RH is
packaged in two space saving packages, the 3 pin power surface mount ceramic SMD-1 or the TO-257 package with 3 lead
form options: straight, up and down.
EQUIVALENT SCHEMATIC
TYPICAL APPLICATIONS
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PIN-OUT INFORMATION
Satellite System Power Supplies
Switching Power Supply Post Regulators
Constant Voltage/Current Regulators
High Efficiency Linear Regulators
TO-257
SMD-1
1
2
3
1
2
3
ADJ
VIN
VOUT
ADJ
VOUT
VIN
CASE=ISOLATED
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ABSOLUTE MAXIMUM RATINGS
VIN
PD
IOUT
TJ
8
11
TST Storage Temperature Range....................
-65°C to +150°C
TLD Lead Temperature Range
(10 Seconds)............................................................. 300°C
TC Case Operating Temperature
MSK5973RH............................................... -40°C to +85°C
MSK5973(K/H)RH..................................... -55°C to +125°C
Input Voltage (VIN-VOUT)........................................ 30VDC
Power Dissipation................................... Internally Limited
Output Current........................................................... 1.5A
Junction Temperature............................................ +150°C
ELECTRICAL SPECIFICATIONS
Parameter
Test Conditions
3V ≤ (VIN - VOUT) ≤ 30V
Reference Voltage
IOUT = 10mA
1
-0.02
IOUT = 10mA
2, 3
-0.05
-
+0.05
-
-
-
%/V
3V ≤ (VIN - VOUT) ≤ 30V
1
-
65
100
-
65
100
µA
IOUT = 10mA
2, 3
-
-
100
-
-
-
µA
3V ≤ (VIN - VOUT) ≤ 30V
1
-5.0
0.2
+5.0
-5.0
0.2
+5.0
µA
IOUT = 10mA
2, 3
-6.0
-
+6.0
-
-
-
µA
VIN = -8V, VOUT = -5V
1
-25
-
+25
-25
-
+25
mV
10mA ≤ IOUT ≤ 1.5A
2, 3
-50
-
+50
-
-
-
mV
VIN = -10V
1
1.5
2.3
-
1.5
2.3
-
A
VOUT = -5V
2, 3
1.5
-
-
-
-
-
A
VOUT = -10V, F = 120Hz, Cadj = 10µF
4
66
-
-
66
-
-
dB
(VIN - VOUT) = 30V
1
-
-
5
-
-
5
mA
Load Regulation
Ripple Rejction
7
2
Minimum Load Current
2
0.002 +0.02
-
-
-0.02
-
V
3V ≤ (VIN - VOUT) ≤ 30V
Adjust Pin Current Change
-1.20
Units
-1.30
Adjust Pin Current
-
MSK5973RH
Min. Typ. Max.
-1.35 -1.25 -1.15
2, 3
Line Regulation
Current Limit
MSK5973K/HRH
Group A
Subgroup Min. Typ. Max.
1
-1.30 -1.25 -1.20
9
0.002 +0.02
V
%/V
Thermal Resistance
2
Junction to Case @ 125°C TO-257 Package
-
-
4.4
4.8
-
4.4
4.8
°C/W
Thermal Resistance
2
Junction to Case @ 125°C SMD-1 Package
-
-
3.7
4.1
-
3.7
4.1
°C/W
NOTES:
1
Output is decoupled to ground using 10µF low ESR tantalum capacitors and 0.1µF ceramic.
2
Guaranteed by design but not tested. Typical parameters are representative of actual device performance but are for reference only. Not
applicable to post irradiation performance.
3
All output parameters are tested using a low duty cycle pulse to maintain TJ = TC.
4
Industrial grade and devices shall be tested to subgroup 1 unless otherwise specified.
5
Military grade devices ("H" and "K" suffix) shall be 100% tested to subgroups 1,2 and 3.
6
Subgroup 1
Subgroup 2
Subgroup 3
7
The output current limit function provides protection from transient overloads but it may exceed the maximum continuous rating. Continuous
operation in current limit may damage the device.
8
Continuous operation at or above absolute maximum ratings may adversely effect the device performance and/or life cycle.
9
Pre and Post irradiation limits at 25°C, up to 100 Krad TID, are identical unless otherwise specified. Post irradiation performance is guaranteed
by design with a 2X radiation design margin.
TA = TC = +25°C
TA = TC = +125°C
TA = TC = -55°C
10
Reference DSCC SMD 5962R09214 for electrical specification for devices purchased as such.
11
Internal solder reflow temperature is 180°C, do not exceed.
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8548-84 Rev. J 9/17
APPLICATION NOTES
OUTPUT VOLTAGE
LOAD REGULATION
The MSK5973RH develops a nominal -1.25V reference voltage
between the output and adjustment terminal. With a constant
reference voltage drop across program resistor R1, a constant
current flows through the output set resistor R2. Since the current
from the adjustment terminal represents an error in the programmed
output voltage, the MSK5973RH was designed to minimize IADJ
and make it very constant with line and load changes. To do this,
all quiescent operating current is returned to the output establishing
a minimum load current requirement. If there is insufficient load on
the output, the output will rise. Figure 1 shows the output voltage
calculations.
The MSK5973RH is capable of providing extremely good load
regulation but a few precautions are needed to obtain maximum
performance. The current set resistor connected between the
adjustment terminal and the output terminal should be tied directly
to the output pin as close to the case of the regulator as possible
rather than near the load. This eliminates package pin and trace
drops from appearing effectively in series with the reference and
degrading regulation. For example, if the regulator is set to -5V
with 0.05Ω resistance between the regulator and the current set
resistor, the output will droop 225mV at 1A due to package pin and
trace resistance. The amount of droop can be calculated as follows:
(Vout at 5mA) - (1.250-(0.05Ω*IL))*(1+R2/R1). The ground of R2 can
be returned near the ground of the load to provide remote ground
sensing and improve load regulation. Figure 2A shows the effect of
resistance between the regulator and 240Ω set resistor.
FIGURE 1
FIGURE 2A
(Degraded Regulation)
INPUT VOLTAGE
The minimum required input voltage for proper operation is
VOUT+ Dropout voltage. See typical performance curves for
dropout performance.
EXTERNAL CAPACITORS
Input bypassing with a 1uF tantalum in parallel with a 0.1uF
ceramic on the input is suitable in most applications. To maximize
transient response and minimize input supply transients more
input capacitance can be added. The adjustment terminal can be
bypassed to ground on the MSK5973RH to improve ripple rejection.
This bypass capacitor prevents ripple from being amplified at higher
output voltages. The impedance of the adjust pin capacitor at the
ripple frequency should be less than the value of R1. For most
application a 10µF bypass capacitor will provide sufficient ripple
rejection at any output level. Increases over 10µF do not appreciably
improve the ripple rejection at frequencies above 120Hz. Output
bypassing with 10µF low ESR tantalum in parallel with a 0.1µF
ceramic attached as close to the regulator's output as possible is
best. This will effectively lower the regulator output impedance,
increase transient response and eliminate any oscillations. Any
increase of the load capacitance larger than 10µF will merely
improve the loop stability and output impedance. See Figure 3 for
typical application schematic.
FIGURE 2B
(Best Case REgulation)
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8548-84 Rev. J 9/17
APPLICATION NOTES CONT'D
PROTECTION DIODES
HEAT SINKING
When external capacitors are used with any IC regulator it
is sometimes necessary to add protection diodes to prevent the
capacitors from discharging through low current points into the
regulator. Most 10µF capacitors have low enough internal series
resistance to deliver 20A spikes when shorted. Although the surge
is short, there is enough energy to stress MSK5973RH. When an
output capacitor is connected to a regulator and the input is shorted
or crowbarred, the output capacitor will discharge into the output
of the regulator. The discharge current depends on the value of
the capacitor, the output voltage of the regulator, and the rate of
decrease of VIN. Figure 3 shows an MSK5973RH with protection
diodes included. D2 is only required if the adjust pin has external
capacitance tied to it .
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 (Rθjc + Rθcs + Rθsa) + Ta
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
EXAMPLE:
This example demonstrates an analysis with the output set to
-10V, where the output current is at 0.5 amp and the input is -15V.
Conditions for MSK5973RH:
VIN = -15V; Iout = 0.5A
1.) Assume 45° heat spreading model.
2.) Find regulator power dissipation:
Pd = (VIN - VOUT)(Iout)
Pd = (15V-10V)(0.5A)
Pd = 2.5W
3.) For conservative design, set Tj = +125°C Max.
4.) For this example, worst case Ta= +90°C.
5.) Rθjc = 4.8°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)/2.5W - 4.8°C/W - 0.15°C/
= 9.0°C/W
In this case the result is 9.0°C/W. Therefore, a heat sink with a
thermal resistance of no more than 9.0°C/W must be used in this
application to maintain regulator circuit junction temperature under
125°C.
FIGURE 3
TOTAL DOSE RADIATION TEST PERFORMANCE
Radiation performance curves for TID testing have been
generated for all radiation testing performed by MS Kennedy. These
curves show performance trends throughout the TID test process
and is located in the MSK5973RH radiation test report. The complete
radiation test report is available in the RAD HARD PRODUCTS
section on the MSK website.
http://www.mskennedy.com/store.asp?pid=9951&catid=19680
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TYPICAL PERFORMANCE CURVES
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MECHANICAL SPECIFICATIONS
ESD TRIANGLE INDICATES PIN 1
WEIGHT=3.2 GRAMS TYPICAL
ALL DIMENSIONS ARE SPECIFIED IN INCHES
ORDERING INFORMATION
MSK5973 K RH U
LEAD CONFIGURATIONS
S= STRAIGHT; U= BENT UP; D= BENT DOWN
RADIATION HARDENED
SCREENING
BLANK= INDUSTRIAL; H=MIL-PRF-38534 CLASS H;
K=MIL-PRF-38534 CLASS K
GENERAL PART NUMBER
The above example is an adjustable Class K regulator with leads bent up.
NOTE: See DSCC SMD 5962R09214 for DSCC part number options.
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8548-84 Rev. J 9/17
MECHANICAL SPECIFICATIONS
WEIGHT = 2.2 GRAMS TYPICAL
ALL DIMENSIONS ARE SPECIFIED IN INCHES
ORDERING INFORMATION
MSK5973 K RH L
3 PAD CERAMIC SMD-1 PACKAGE
RADIATION HARDENED
SCREENING
BLANK= INDUSTRIAL; H=MIL-PRF-38534 CLASS H;
K=MIL-PRF-38534 CLASS K
GENERAL PART NUMBER
The above example is an adjustable Class K regulator.
NOTE: See DSCC SMD 5962R09214 for DSCC part number options.
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8548-84 Rev. J 9/17
REVISION HISTORY
REV
H
J
STATUS
Released
Released
DATE
10/14
09/17
DESCRIPTION
Format update, add internal note and clarify mechanical outline
Update parameters to better correlate to manufacturer's pre and post RAD specs.
ANAREN, MSK Products
www.anaren.com/msk
The information contained herein is believed to be accurate at the time of printing. Anaren, MSK products 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.
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8548-84 Rev. J 9/17