MIL-PRF-38534 AND 38535 CERTIFIED FACILITY
RAD HARD POSITIVE,
1.5 AMP, LOW DROPOUT
ADJ VOLTAGE REGULATOR
5970RH
FEATURES:
•
•
•
•
•
•
•
•
•
Manufactured using
Space Qualified RH1086 Die
Total Dose Hardened to 100 Krads(Si) (Method 1019.7 Condition A)
Low Dropout Voltage
Internal Short Circuit Current Limit
Output Voltage is Adjustable with 2 External Resistors
SMD-1
Output Current Capability to 1.5 Amps
Internal Thermal Overload Protection
3 PAD
Non RAD Hard EDU devices available
CERAMIC
Available to DSCC SMD 5962R09211
TO-257
DESCRIPTION:
The MSK5970RH offers low dropout voltage while offering radiation tolerance for space applications. This, combined with
the low θJC, allows increased output current while providing exceptional device efficiency. Because of the increased efficiency,
a small hermetic 3 pin package can be used providing maximum performance while occupying minimal board space. Output
voltage is selected by the user through the use of 2 external resistors. Additionally, the regulator offers internal short circuit
current and thermal limiting, which allows circuit protection and eliminates the need for external components and excessive
derating. The MSK5970RH is packaged in two space saving options; 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
PIN-OUT INFORMATION
TYPICAL APPLICATIONS
•
•
•
•
High Efficiency Linear Regulator
Constant Voltage/Current Regulators
System Power Supplies
Switching Power Supply Post Regulators
1
TO-257
SMD-1
1 ADJ
2 VOUT
3 VIN
CASE = ISOLATED
1 ADJ
2 VIN
3 VOUT
LID = ISOLATED
8548-135 Rev. J 9/17
ABSOLUTE MAXIMUM RATINGS
±VIN
Pd
IOUT
TJ
8
11
Input Voltage (WRT VOUT..................................25V
Power Dissipation..........................Internally Limited
7
Output Current...................................................1.5A
Junction Temperature...................................+150°C
TST Storage Temperature Range...........-65°C to +150°C
TLD Lead Temperature Range
TC
(10 Seconds)...................................................300°C
Case Operating Temperature Range
MSK5970RH..................................-40°C to +85°C
12
MSK5970EDU................................-40°C
to +85°C
MSK5970K/HRH..........................-55°C to +125°C
ESD Rating...........................................................3A
ELECTRICAL SPECIFICATIONS
Parameter
Typ.
Max.
Min.
Typ.
Max.
1
1.238
1.250
1.262
1.225
1.250
1.270
V
2, 3
1.225
1.250
1.270
-
-
-
V
1
1.205
1.250
1.270
1.205
1.250
1.270
V
1
-
1.3
1.575
-
1.3
1.6
V
IOUT = 10 mA
1
-0.5
0.1
0.5
-
0.1
0.6
%
(VOUT +3V) ≤ VIN ≤ (VOUT +15V)
2, 3
-0.75
0.2
0.75
-
-
-
%
VIN = VOUT +3V
1
-1.0
0.2
1.0
-
0.2
2.0
%
10mA ≤ IOUT ≤ 1.5A
2, 3
-2.0
0.3
2.0
-
-
-
%
VIN = VOUT +5V
1
1.5
2.0
-
1.5
2.0
-
A
-
60
75
-
60
75
-
DB
3
9
VIN = VOUT +3V
Post Irradiation
Dropout Voltage
10mA ≤ IOUT ≤ 1.5A
Line Regulation
Load Regulation
Short Circuit Current
Ripple Rejection
7
2
MSK5970RH/EDU
Min.
IOUT = 10mA
Reference Voltage
MSK5970K/HRH
Group A
Subgroup
Test Conditions
VOUT = 1%
IOUT = 1.5A; COUT = 25µF;
f = 120Hz
Units
Thermal Resistance
2
Junction to Case @ 125C TO-257 Package
-
-
5.3
5.7
-
5.3
5.7
°C/W
Thermal Resistance
2
Junction to Case @ 125C SMD-1 Package
-
-
4.7
5.1
-
4.7
5.1
°C/W
NOTES:
1
Output is decoupled to ground using 22µF 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. 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
2
3
TA = +25°C
TA = +125°C
TA = -55°C
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. For compliance with MIL-STD 883 revision C current density specifications, the MSK5970RH
is derated to 1 Amp.
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 100Krad TID, are identical unless otherwise specified. Post irradiation performance is guaranteed
by design with a 2X radiation design margin.
10
Reference DSCC SMD 5962R09211 for electrical specification for devices purchased as such.
11
Internal solder reflow temperature is 180°C, do not exceed.
12
MSK5970EDU does not use RAD Hard Die, Post Irradiation specifications are not applicable.
2
8548-135 Rev. J 9/17
APPLICATION NOTES
BYPASS CAPACITORS
LOAD REGULATION
Minimum requirement for output capacitance is 10uF, low
ESR tantalum. A 22µF low ESR (0.5-2 ohm) tantalum capacitor
attached close to the regulator's output will ensure stability
in most applications. 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.
With a three-terminal device, it is not possible to provide true
remote load sensing. The resistance of the connection to the load
will limit the load regulation of the device. The best load regulation
will be achieved when the top of the divider is connected to the
pin as close to the case of the MSK5970RH as possible and the
bottom of the divider as close to the load as possible. This will
effectively reduce the effect of the parasitic line resistance on the
load regulation of the device.
Refer to Figure 2 for proper connections.
OUTPUT VOLTAGE
The MSK5970RH develops a 1.250 Volt reference between
the output pin and the adjust pin. A resistor, R1, is placed between
the output and adjust pins, causing current to flow through R1 and
down through R2, setting the output voltage. R1 may be chosen
to sink the minimum required load current of 10mA. Refer to Figure
1 for connections and VOUT calculation.
FIGURE 2
RIPPLE REJECTION
The typical curve for ripple rejection is shown with the adjust
pin bypassed as shown in Figure 3. For proper bypassing and ripple
rejection approaching the values of the curve, the impedance of
the adjust pin capacitor at the ripple frequency should be less than
the value of R1. The value of the adjust pin capacitor is a function
of the input ripple frequency. For instance, if R1=100Ω, at 120Hz
the adjust pin capacitor should be 25µF. At 10KHz only 0.22uF is
required.
FIGURE 1
FIGURE 3
3
8548-135 Rev. J 9/17
APPLICATION NOTES
APPLICATION NOTES CONT'D
OVERLOAD SHUTDOWN
HEAT SINKING
The regulator features both power and thermal overload
protection. When the maximum power dissipation is not exceeded,
the regulator will current limit slightly above it's 1.5 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 also shuts down 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.
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 + Rθqcs + Rθsa) + Ta
WHERE
Tj
=
Pd
=
Rθjc =
Rθcs =
Rθsa =
Tc
=
Ta
=
Ts
=
TOTAL DOSE RADIATION TEST PERFORMANCE
Radiation performance curves for TID testing have been
generated for all radiation testing performed by MSK. These curves
show performance trends throughout the TID test process and can
be located in the MSK5970RH radiation test report. The complete
radiation test report is available in the RAD HARD PRODUCTS
section on the MSK website.
Junction Temperature
Total Power Dissipation
Junction to Case Thermal Resistance
Case to Heat Sink Thermal Resistance
Heat Sink to Ambient Thermal Resistance
Case Temperature
Ambient Temperature
Heat Sink Temperature
EXAMPLE:
This example demonstrates the thermal calculations for the TO-257
package with the regulator operating at one-half of its maximum
rated output current.
http://www.mskennedy.com/store.asp?pid=9951&catid=19680
Conditions for MSK5970RH:
VIN = +8.0V; Iout = +0.75A
1.) Assume 45° heat spreading model.
2.) Find positive regulator power dissipation:
Pd = (VIN - VOUT)(Iout)
Pd = (8-5)(0.75)
= 2.25W
3.)
4.)
5.)
6.)
7.)
For conservative design, set Tj = +125°C Max.
For this example, worst case Ta = +90°C.
Rθjc = 5.7°C/W from the Electrical Specification Table.
Rθcs = 0.15°C/W for most thermal greases.
Rearrange governing equation to solve for Rθsa:
Rθsa = ((Tj - Ta)/Pd) - (Rθjc) - (Rθcs)
= (125°C - 90°C) / 2.25W - 5.7°C/W - 0.15°C/W
= 9.7°C/W
In this case the result is 9.7°C/W. Therefore, a heat sink with
a thermal resistance of no more than 9.7°C/W must be used in this
application to maintain regulator circuit junction temperature under
125°C.
4
8548-135 Rev. J 9/17
TYPICAL PERFORMANCE CURVES
5
8548-135 Rev. J 9/17
MECHANICAL SPECIFICATIONS
ESD TRIANGLE INDICATES PIN 1
WEIGHT=3.2 GRAMS TYPICAL
ALL DIMENSIONS ARE SPECIFIED IN INCHES
ORDERING INFORMATION
MSK5970 H RH U
LEAD CONFIGURATIONS
S = STRAIGHT; U = BENT UP; D = BENT DOWN
RADIATION HARDENED
RH = RADIATION HARDENED; BLANK = EDU
SCREENING
EDU = NON RAD HARD ENGINEERING UNITS
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.
Ordering information for the 3 pad ceramic SMD-1 package is contained on the next page.
NOTE: See DSCC SMD 5962R09211 for DSCC part number options.
6
8548-135 Rev. J 9/17
MECHANICAL SPECIFICATIONS
WEIGHT=2.2 GRAMS TYPICAL
ALL DIMENSIONS ARE SPECIFIED IN INCHES
ORDERING INFORMATION
MSK5970 K RH L
3 PAD CERAMIC SMD-1 PACKAGE
RADIATION HARDENED
RH = RADIATION HARDENED; BLANK = EDU
SCREENING
EDU = NON RAD HARD ENGINEERING UNITS
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 5962R09211 for DSCC part number options.
7
8548-135 Rev. J 9/17
REVISION HISTORY
REV
F
G
H
J
STATUS
Released
Released
Released
Released
DATE
10/14
12/14
08/17
09/17
DESCRIPTION
Format update, add internal note and clarify mechanical specifications.
Add case = isolated to pin out info and ESD rating.
Add EDU device type.
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.
8
8548-135 Rev. J 9/17