MIL-PRF-38534 & 38535 CERTIFIED FACILITY
M.S.KENNEDY CORP.
FEATURES:
RAD HARD
ULTRA LOW DROPOUT
POSITIVE LINEAR REGULATOR
5822RH
SERIES
4707 Dey Road Liverpool, N.Y. 13088
(315) 701-6751
Manufactured using
Space Qualified RH1573 Die
New "Harder" Version of MSK 5922RH
Total Dose Hardened to 300 Krads(Si) (Method 1019.7 Condition A)
Low Dropout for Reduced Power Consumption
Latching Overload Protection
Available in 1.5V,1.9V,2.5V,2.8V,3.3V and 5.0V Output Voltages
Alternate Output Voltages Available
Output Current Limit
Available in 3 Lead Form Options: Straight, Up and Down
Seperate Bias/Vin Pins for Improved Efficiency
Available to DSCC SMD 5962F09236
ELDRS Tested to 100 Krads(Si) (Method 1019.7 Condition D)
Neutron Tested to 1.0x10¹² n/cm² (Method 1017.2)
DESCRIPTION:
The MSK 5822RH is a rad hard fixed linear regulator capable of delivering 5.0 amps of output current. Typical dropout
is only 0.35 volts with a 2.5 amp load. Separated power and bias simplifies supply tracking. This device also has latching
overload protection. The MSK 5822RH is radiation hardened 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
Satellite System Power Supplies
Switching Power Supply Post Regulators
Constant Voltage/Current Regulators
Microprocessor Power Supplies
PIN-OUT INFORMATION
1 VIN
2 VBIAS
3 VOUT
4 GND
5 LATCH
CASE=ISOLATED
8548-61 Rev. H 7/12
1
ABSOLUTE MAXIMUM RATINGS
VBIAS
VIN
I
OUT
T
C
8
Bias Supply Voltage
+10V
Supply Voltage
+10V
Output Current
7
5A
Case Operating Temperature Range
MSK5822K/H RH
-55°C to +125°C
MSK5822RH
-40°C to +85°C
T
ST
T
LD
P
D
T
C
Storage Temperature Range -65°C to +150°C
300°C
Lead Temperature Range
(10 Seconds)
See SOA Curve
Power Dissipation
150°C
Junction Temperature
ELECTRICAL SPECIFICATIONS
PART NUMBER
MSK5822-1.5
MSK5822-1.9
MSK5822-2.5
MSK5822-2.8
OUTPUT VOLTAGE
+1.5V
+1.9V
+2.5V
+2.8V
+3.3V
+5.0V
NOTES:
MSK5822-3.3
MSK5822-5.0
1 Unless otherwise specified, VIN=VOUT+1V, VBIAS=5V and I
OUT
=10mA. See figure 2 for typical test circuit.
2 Guaranteed by design but not tested. Typical parameters are representative of actual device performance but are for reference
only.
3 Industrial grade devices shall be tested to subgroups 1 and 4 unless otherwise requested.
4 Military grade devices ("H" and "K" suffix) shall be 100% tested to subgroups 1,2,3 and 4.
5 Subgroup 5 and 6 testing available upon request.
6 Subgroup 1,4 T
C
=+25°C
Subgroup 2,5
T
C
=+125°C
Subgroup 3,6
T
A
=-55°C
7 Output current limit is dependent upon the values of VIN and VOUT. See Figure 1 and typical performance curves.
8 Continuous operation at or above absolute maximum ratings may adversely effect the device performance and/or life cycle.
9 VIN shall be as specified or VIN min., whichever is greater.
10 Saturation voltage varies with load. See typical performance curves.
11 Pre and post irradiation limits, at +25°C, up to 300Krad TID, are identical unless otherwise specified.
12 Reference DSCC SMD 5962F09236 for electrical specifications for devices purchased as such.
2
8548-61 Rev. H 7/12
APPLICATION NOTES
PIN FUNCTIONS
VIN -
This pin provides the input power connection to the
MSK 5822RH. This is the supply that will be regulated to the
output. Input voltage range is VOUT + V
DROPOUT
to 6.5V.
VBIAS -
This pin provides power to all internal circuitry
including bias, start-up, thermal limit and overcurrent latch.
VBIAS voltage range is 2.9V to 6.5V. VBIAS should be
kept greater than or equal to VIN.
LATCH -
The MSK 5822RH LATCH pin is used for both cur-
rent limit and thermal limit. A capacitor between the LATCH
pin and ground sets a time out delay in the event of an over
current or short circuit condition. The capacitor is charged
to approximately 1.6V from a 7.2 A (nominal) current source.
Exceeding the thermal limit charges the latch capacitor from
a larger current source for a near instant shutdown. Once
the latch capacitor is charged the device latches off until the
latch is reset. Momentarily pull the LATCH pin low, or cycle
the power to reset the latch. Cycling the bias power dis-
ables the device during the reset operation. Pulling the LATCH
pin low immediately enables the device for as long as the
LATCH pin is held low plus the time delay to re-charge the
latch capacitor whether or not the fault has been corrected.
Disable the latch feature by tying the LATCH pin low. With
the LATCH pin held low the thermal limit feature is disabled
and the current limit feature will force the output voltage to
droop but remain active if excessive current is drawn.
GND -
Internally connected to ground, this pin should be
connected externally by the user to the circuit ground.
VOUT -
This is the output pin for the device.
START UP OPTIONS
The MSK 5822RH starts up and begins regulating immedi-
ately when VBIAS and VIN are applied simultaneously. Ap-
plying VBIAS before VIN starts the MSK 5822RH up in a
disabled or latched state. When starting in a latched state
the device output can be enabled by pulling the latch pin low
to drain the latch capacitor. Hold the latch pin low and re-
lease after VIN comes up to ensure automatic startup when
applying VBIAS before VIN. The basic circuit below can be
adapted to a variety of applications for automatic start up
when VBIAS rises before VIN.
START UP CURRENT
The MSK 5822RH 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/
INPUT POWER SUPPLY BYPASSING
To maximize transient response and minimize power sup-
ply transients it is recommended that two 47 F tantalum
capacitors are connected between VIN and ground. A 0.1 F
ceramic capacitor should also be used for high frequency
bypassing. See typical application circuit.
OVERCURRENT LATCH-OFF/LATCH PIN CAPACITOR
SELECTION
As previously mentioned, the LATCH pin provides over
current/output short circuit protection with a timed latch-
off circuit. Reference the LATCH pin description note. The
latch off time out is determined with an external capacitor
connected from the LATCH pin to ground. The time-out
period is equal to the time it takes to charge this external
capacitor from 0V to 1.6V. The latch charging current is
provided by an internal current source. This current is a
function of bias voltage and temperature (see latch charg-
ing current curve). For instance, at 25°C, the latch charg-
ing current is 7.2 A at VBIAS=3V and 8 A at
VBIAS=6.5V.
In the latch-off mode, some additional current will be
drawn from the bias supply. This additional latching cur-
rent is also a function of bias voltage and temperature
(see typical performance curves).
The MSK 5822RH current limit function is directly affected
by the input and output voltages. Custom current limit is
available; contact the factory for more information.
3
8548-61 Rev. H 7/12
OUTPUT CAPACITOR SELECTION
Output capacitors are required to maintain regulation and
stability. Between 440 and 100 F surface mount, low ESR,
tantalum capacitor from the output to ground should suffice
under most conditions. See typical application circuit for rec-
ommended capacitance. Ceramic output capacitors (0.1 F
typical) should be placed directly across the load power con-
nections as close to the load as possible. If the user finds
that tighter voltage regulation is needed during output tran-
sients, more capacitance may be added. If more capacitance
is added to the output, the bandwidth may suffer.
APPLICATION NOTES CONT.
THERMAL LIMITING
The MSK 5822RH control circuitry has a thermal shut-
down temperature of approximately 150°C. This ther-
mal 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 condi-
tions. Exceeding the thermal limit activates the latch fea-
ture of the MSK 5822RH. Momentarily pull the latch pin
low or cycle the power to reset the latch.
TYPICAL APPLICATIONS CIRCUIT
HEAT SINK SELECTION
To select a heat sink for the MSK 5822RH, the following
formula for convective heat flow may be used.
Governing Equation:
T
J
=
P
D
X (R
θJC
+ R
θCS
+ R
θSA
) + T
A
Where
T
J
P
D
R
θJC
R
θCS
R
θSA
T
A
=
=
=
=
=
=
Junction Temperature
Total Power Dissipation
Junction to Case Thermal Resistance
Case to Heat Sink Thermal Resistance
Heat Sink to Ambient Thermal Resistance
Ambient Temperature
FIGURE 2
Power Dissipation=(VIN-VOUT) x I
OUT
Next, the user must select a maximum junction tem-
perature. The absolute maximum allowable junction tem-
perature is 150°C. The equation may now be rearranged
to solve for the required heat sink to ambient thermal
resistance (R
θSA
).
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 are located in the MSK 5822RH radiation
test report. The complete radiation test report will be avail-
able in the RAD HARD PRODUCTS section on the MSK
website.
Example:
An MSK 5822-2.5RH is connected for VIN=+3.3V and
VOUT=+2.5V. I
OUT
is a continuous 3A DC level. The ambi-
ent temperature is +25°C. The maximum desired junction
temperature is +125°C.
R
θJC
=3.0°C/W and R
θCS
=0.15°C/W for most thermal
greases
Power Dissipation=(3.3V-2.5V) x (3A)
=2.4 Watts
Solve for R
θSA:
R
θSA
=
125°C - 25°C
- 3.0°C/W - 0.15°C/W
2.4W
http://www.mskennedy.com/store.asp?pid=9951&catid=19680
Reference the MSK 5826RH RAD REPORT for ELDRS and
Neutron results.
= 38.5°C/W
In this example, a heat sink with a thermal resistance
of no more than 38°C/W must be used to maintain a
junction temperature of no more than 125°C.
4
8548-61 Rev. H 7/12
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