MIL-PRF-38534 AND 38535 CERTIFIED FACILITY
M.S.KENNEDY CORP.
RAD HARD
ULTRA LOW DROPOUT
POSITIVE LINEAR REGULATOR
5920RH
SERIES
FEATURES:
Total Dose Hardened to 100 Krads(Si) (Method 1019.7 Condition A)
Ultra Low Dropout for Reduced Power Consumption
External Shutdown Function
Latching Overload Protection
Available in 1.5V,1.8V,1.9V,2.5V,2.8V,3.3V and 5.0V Output Voltages
Alternate Output Voltages Available
Output Current Limit
Available in 4 Lead Form Options: Straight, Up, Down and Gull Wing
Replaces IR OMR9601 and IRUH33PXXXB/IRUH50PXXXB
Available as SMD 5962R05220
RAD Certified by DSCC
DESCRIPTION:
The MSK5920RH is a rad hard fixed linear regulator capable of delivering 5.0 amps of output current. Typical dropout is
only 0.30 volts with a 3 amp load. An external shutdown function is ideal for power supply sequencing. This device also has
internal latching overload protection. The MSK5920RH is radiation hard and specifically designed for space/satellite applications. The device is packaged in a hermetically sealed space efficient 5 pin SIP that is electrically isolated from the internal
circuitry allowing for direct heat sinking.
EQUIVALENT SCHEMATIC
TYPICAL
APPLICATIONS
TYPICAL APPLICATIONS
PIN-OUT INFORMATION
1
2
3
4
5
Satellite System Power Supplies
Switching Power Supply Post Regulators
Constant Voltage/Current Regulators
Microprocessor Power Supplies
VIN
GND
VOUT
SHUTDOWN
N/C
CASE=ISOLATED
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ABSOLUTE MAXIMUM RATINGS
+VIN
VSD
IOUT
TC
Supply Voltage
+10V
Shutdown Voltage
10V
Output Current 7
5A
Case Operating Temperature Range
MSK5920K/H RH
-55°C to +125°C
MSK5920RH
-40°C to +85°C
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TST
TLD
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PD
TC
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-65°C to +150°C
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300°C
See SOA Curve
150°C
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NOTES:
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ELECTRICAL SPECIFICATIONS
1
2
3
4
5
6
Storage Temperature Range
Lead Temperature Range
(10 Seconds)
Power Dissipation
Junction Temperature
PART NUMBER
OUTPUT VOLTAGE
MSK5920-1.5
+1.5V
MSK5920-1.8
+1.8V
MSK5920-1.9
+1.9V
MSK5920-2.5
+2.5V
MSK5920-2.8
+2.8V
MSK5920-3.3
+3.3V
MSK5920-5.0
+5.0V
Unless otherwise specified, VIN=VOUT+1V, VSHUTDOWN=0V and IOUT=10mA. See figure 2 for typical test circuit.
Guaranteed by design but not tested. Typical parameters are representative of actual device performance but are for reference only.
Industrial grade devices shall be tested to subgroups 1 and 4 unless otherwise requested.
Military grade devices ("H" and "K" suffix) shall be 100% tested to subgroups 1,2,3 and 4.
Subgroup 5 and 6 testing available upon request.
Subgroup 1,4 TC=+25°C
Subgroup 2,5 TC=+125°C
Subgroup 3,6 TA=-55°C
Output current limit is dependent upon the values of VIN and VOUT. See Figure 1 and typical performance curves.
Continuous operation at or above absolute maximum ratings may adversely effect the device performance and/or life cycle.
VIN shall be as specified or VIN min., whichever is greater.
Not applicable to versions where VIN = VIN Min.
Pre and post irradiation limits at 25°C, up to 100Krad TID, are identical unless otherwise specified.
Reference DSCC SMD 5962R05220 for electrical specifications for devices purchased as such.
Internal solder reflow temperature is 180°C, do not exceed.
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APPLICATION NOTES
PIN FUNCTIONS
VIN - This pin provides power to all internal circuitry including bias, start-up, thermal limit and overcurrent latch.
Input voltage range is 2.9V to 6.5V.
GND - Internally connected to ground, this pin should be
connected externally by the user to the circuit ground.
SHUTDOWN - There are two functions to the SHUTDOWN
pin. It may be used to disable the output voltage or to
reset a current latch condition. To activate the shutdown/
reset functions the user must apply a voltage greater than
1.6V to the SHUTDOWN pin. The voltage applied to the SHUTDOWN pin can be greater than the input voltage. The output
voltage will turn on when the SHUTDOWN pin is pulled below the threshold voltage. If the SHUTDOWN pin is not used,
it should be connected to ground. It should be noted that
with the shutdown pin tied to ground, a current latch condition can only be reset by cycling power off, then on.
VOUT - This is the output pin for the device.
FIGURE 1
OVERCURRENT LATCH
CURRENT LIMIT AND SOA
Overcurrent protection is provided by the MSK5920RH
series through the use of a timed latch off circuit. The
internal latch timeout is triggered by an overcurrent condition. To allow for start up surge currents, the timeout is
approximately 5.5mS at 25°C. If the overcurrent condition remains at the end of the timeout cycle, the regulator
will latch off until the latch is reset. Reset the latch by
pulling the shutdown pin high or cycling VIN off then back
on. A thermal limit condition will trigger the latch with no
time out delay.
The MSK5920RH current limit function is directly affected
by the input and output voltages. Figure 1 illustrates the relationship between VIN and ICL for various output voltages. It
is very important for the user to consult the SOA curve when
using input voltages which result in current limit conditions
beyond 4.5 Amps. When using input voltages which result in
current limit above 4.5 Amps, the user must maintain output
current within the SOA curve to avoid damage to the device.
Note that 5 Amp maximum is due to current carrying capability of the internal wirebonds.
INPUT POWER SUPPLY BYPASSING
REPLACING THE OMR9601/IRUH33P253AIM
To maximize transient response and minimize power supply transients it is recommended that a 100μF tantalum
capacitor is connected between VIN and ground. A 0.1μF
ceramic capacitor should also be used for high frequency
bypassing.
When the MSK5920-2.5RH is used as a replacement for
the IR OMR9601 or IRUH33P253B, the user should recognize that the MSK5920-2.5RH does not contain internal tantalum capacitors on the input and output.
OUTPUT CAPACITOR SELECTION
START UP CURRENT
Low ESR output capacitors are required to maintain regulation and stability. Four CWR29FB227 (AVX PN
TAZH227K010L) tantalum capacitors in parallel with ceramic decoupling capacitors (0.1μF typical) provides sufficient gain and phase margin for most applications. The
maximum ESR specification for the CWR29FB227 capacitor is 180mΩ at 100kHz and is sufficient for many applications. MSK has found through full WCCA that screening for a maximum ESR of 57mΩ ensures EOL stability
criteria to be met for many applications with the most
stringent requirements. The typical ESR of the
TAZH227K010L from AVX is 49mΩ . Analysis of the final design is recommended to ensure stability requirements are met.
The MSK5920RH sinks increased current during startup to
bring up the output voltage. Reference the "Saturated Drive
Current vs. Input Voltage" graph in the typical performance
curves of this data sheet and the "Understanding Startup
Surge Current With MS Kennedy's RH1573 Based Rad Hard
LDO Regulators" application note in the application notes
section of the MS Kennedy Web site for more information.
http://www.mskennedy.com/
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APPLICATION NOTES CONT.
THERMAL LIMITING
TYPICAL APPLICATIONS CIRCUIT
The MSK5920RH control circuitry has a thermal shutdown temperature of approximately 150°C. This thermal shutdown can be used as a protection feature, but
for continuous operation, the junction temperature of the
pass transistor must be maintained below 150°C. Proper
heat sink selection is essential to maintain these conditions. Exceeding the thermal limit activates the latch feature of the MSK5920RH. Toggle the shutdown pin high them
low or cycle power to reset the latch. See shutdown pin
description and overcurrent latch description for more information.
HEAT SINK SELECTION
To select a heat sink for the MSK5920RH, the following
formula for convective heat flow may be used.
Governing Equation:
TJ = PD X (RθJC + RθCS + RθSA) + TA
Where
TJ
PD
RθJC
RθCS
RθSA
TA
=
=
=
=
=
=
Junction Temperature
Total Power Dissipation
Junction to Case Thermal Resistance
Case to Heat Sink Thermal Resistance
Heat Sink to Ambient Thermal Resistance
Ambient Temperature
Power Dissipation=(VIN-VOUT) x IOUT
Next, the user must select a maximum junction temperature. The absolute maximum allowable junction temperature is 150°C. The equation may now be rearranged
to solve for the required heat sink to ambient thermal
resistance (RθSA).
FIGURE 2
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 can be located in
the MSK5920RH radiation test report. The complete radiation test report is available in the RAD HARD PRODUCTS
section on the MSK website.
Example:
An MSK5920-2.5RH is connected for VIN=+3.3V and
VOUT=+2.5V. IOUT is a continuous 3A DC level. The ambient temperature is +25°C. The maximum desired junction temperature is +125°C.
http://www.mskennedy.com/store.asp?pid=9951&catid=19680
RθJC=4.0°C/W and RθCS=0.15°C/W for most thermal
greases
Power Dissipation=(3.3V-2.5V) x (3A)
=2.4 Watts
Solve for RθSA:
RθSA=
125°C - 25°C
-4.0°C/W - 0.15°C/W
2.4W
= 36.5°C/W
In this example, a heat sink with a thermal resistance
of no more than 36.5°C/W must be used to maintain a
junction temperature of no more than 125°C.
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TYPICAL PERFORMANCE CURVES
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TYPICAL PERFORMANCE CURVES
GAIN AND PHASE RESPONSE
The gain and phase response curves are for the MSK typical application circuit and are representative of typical device
performance, but are for reference only. The performance should be analyzed for each application to insure individual
program requirements are met. External factors such as temperature, input and output voltages, capacitors, etc. all
can be major contributors. Please consult factory for additional details.
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MECHANICAL SPECIFICATIONS
ESD TRIANGLE INDICATES PIN 1
WEIGHT=7.7 GRAMS TYPICAL
ALL DIMENSIONS ARE SPECIFIED IN INCHES
ORDERING INFORMATION
MSK5920-3.3 K RH GW
LEAD CONFIGURATIONS
GW= GULL WING
RADIATION HARDENED
SCREENING
BLANK= INDUSTRIAL; H=MIL-PRF-38534 CLASS H;
K=MIL-PRF-38534 CLASS K
OUTPUT VOLTAGE
1.5=+1.5V; 1.8=+1.8V; 1.9=+1.9V; 2.5=+2.5V;
2.8=+2.8V; 3.3=+3.3V; 5.0=+5.0V
GENERAL PART NUMBER
The above example is a +3.3V, Class K regulator with gull wing leads.
NOTE: See DSCC SMD 5962R05220 for DSCC part number options.
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MECHANICAL SPECIFICATIONS
ESD TRIANGLE INDICATES PIN 1
WEIGHT=7.7 GRAMS TYPICAL
ALL DIMENSIONS ARE SPECIFIED IN INCHES
ORDERING INFORMATION
MSK5920-3.3 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
OUTPUT VOLTAGE
1.5=+1.5V; 1.8=+1.8V; 1.9=+1.9V; 2.5=+2.5V;
2.8=+2.8V; 3.3=+3.3V; 5.0=+5.0V
GENERAL PART NUMBER
The above example is a +3.3V, Class K regulator with leads bent up.
NOTE: See DSCC SMD 5962R05220 for DSCC part number options.
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REVISION HISTORY
M.S. Kennedy Corp.
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.
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