MIL-PRF-38534 CERTIFIED FACILITY
M.S.KENNEDY CORP.
FEATURES:
RAD HARD
ULTRA LOW DROPOUT
POSITIVE LINEAR REGULATOR
5922RH
SERIES
4707 Dey Road Liverpool, N.Y. 13088
(315) 701-6751
Total Dose Tested to 300K RAD (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
Initial Output Tolerance of 0.5%
DESCRIPTION:
The MSK 5922RH is a rad hard fixed linear regulator capable of delivering 5.0 amps of output current. Typical
dropout is only 0.22 volts with a 2.5 amp load. Separated power and bias simplifies supply tracking. This device also
has latching overload protection. The MSK 5922RH 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
2
3
4
5
1
VIN
VBIAS
VOUT
GND
LATCH
Rev. H 6/11
ABSOLUTE MAXIMUM RATINGS
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8
ELECTRICAL SPECIFICATIONS
Parameter
Input Voltage Range
2
Input Bias Voltage
2
Quiescent Current
Bias Current
Test Conditions
1 9 12
10mA
≤
I
OUT
≤
1.0A
V
BIAS
≥
V
IN
I
IN
+I
BIAS
, V
BIAS
=V
IN
=6.5V, Not including I
OUT
V
BIAS
=6.5V
V
IN
=V
OUT
+1V
I
OUT
=1A
I
OUT
=50mA
V
OUT
+0.4V
≤
V
IN
≤
6.5V
Load Regulation
9
50mA
≤
I
OUT
≤
3.0A
V
IN
=
V
OUT
+1V
Delta V
OUT
=1%
Pin 5(Latch)=GND
I
OUT
=2.5A
I
OUT
=0.5A
Post Radiation
Group A
Subgroup
1,2,3
1,2,3
1,2,3
1,2,3
1
2,3
1
1
2,3
1
2,3
1
2,3
1
2,3
1
2,3
Ripple Rejection
2
MSK5922K/H RH
Min.
Note 10
2.9
-
-
-
-
-
-
-
-
-
-
-
-
-
3.0
3.0
65
65
-
Typ.
-
5.0
14
2
±0.1
-
-
±0.1
-
Max.
6.5
6.5
20
4
±0.5
±2.5
±4.0
±0.50
±2.5
MSK5922RH
Min.
Note 10
2.9
-
-
-
-
-
-
-
-
-
-
-
-
-
3.0
-
65
-
-
Typ.
-
5.0
14
2
±0.1
-
-
0.01
-
0.06
-
0.22
-
0.11
-
-
-
-
-
2.2
Max.
6.5
6.5
20
4
±1.0
-
±4.5
±0.60
-
±1.0
-
0.45
-
0.30
-
5
-
-
-
3.5
Output Voltage Tolerance
Line Regulation
9
±0.06 ±0.80
-
0.22
0.26
0.11
0.12
-
-
-
-
2.2
±2.5
0.40
0.40
0.30
0.30
5
5
-
-
3.0
Dropout Voltage
11
Output Current Limit
7 9
V
IN
=V
OUT
+1V Overcurrent Latch Up
f=120Hz
I
OUT
=
50mA
4
5,6
-
Thermal Resistance
2
Junction to Case @ 125°C Output Device
PART NUMBER
MSK5922-1.5
MSK5922-1.9
MSK5922-2.5
MSK5922-2.8
MSK5922-3.3
OUTPUT VOLTAGE
+1.5V
+1.9V
+2.5V
+2.8V
+3.3V
+5.0V
NOTES:
1
2
3
4
5
6
7
8
9
10
11
12
MSK5922-5.0
Unless otherwise specified, VIN=VOUT+1V, VBIAS=5V 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.
With VBIAS (Pin 2) connected to a separate source, VIN MIN is VOUT+VDROPOUT; see dropout specifications and performance curves.
Saturation voltage varies with load. See typical performance curves. Latch Pin=GND to prevent latch off during testing, see latch pin description.
Pre and post irradiation limits, at +25°C, up to 100Krad TID, are identical unless otherwise specified.
2
Rev. H 6/11
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P
D
T
C
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+V
BIAS
Bias Supply Voltage
+10V
+V
IN
Supply Voltage
+10V
I
OUT
Output Current
7
5A
T
C
Case Operating Temperature Range
MSK5922K/H RH
-55°C to +125°C
MSK5922RH
-40°C to +85°C
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T
ST
T
LD
Storage Temperature Range -65°C to +150°C
300°C
Lead Temperature Range
(10 Seconds)
See SOA Curve
Power Dissipation
150°C
Junction Temperature
Units
V
V
mA
mA
%
%
%
%
%
%
%
V
V
V
V
A
A
dB
dB
°C/W
APPLICATION NOTES
PIN FUNCTIONS
VIN -
This pin provides the input power connection to the MSK
5922RH. This is the supply that will be regulated to the output.
Input voltage range is VOUT + VDROPOUT to 6.5V.
VBIAS -
This pin provides power to all internal circuitry including
bias, start-up, thermal limit and overcurrent latch. VBIAS volt-
age range is 2.9V to 6.5V. VBIAS should be kept greater than or
equal to VIN.
LATCH -
The MSK 5922RH LATCH pin is used for both current
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. In the event of an overcurrent condition,
output short circuit or dropout condition, the pass transistor and
drive circuit will saturate and initiate the latch timing circuit.The
capacitor is charged to approximately 1.6V from a 7.2μA (nomi-
nal) current source. Exceeding the thermal limit charges the latch
capacitor from a larger current source for a near instant shut-
down. 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 capaci-
tor 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 con-
nected externally by the user to the circuit ground.
VOUT -
This is the output pin for the device.
START UP OPTIONS
The MSK 5922RH starts up and begins regulating immedi-
ately when VBIAS and VIN are applied simultaneously. Apply-
ing VBIAS before VIN starts the MSK 5922RH 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 release 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.
OVERCURRENT LATCH-OFF/LATCH PIN CAPACITOR
SELECTION
As previously mentioned, the LATCH pin provides over cur-
rent/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 charging current curve). For instance, at 25°C, the latch
charging current is 7.2μA at VBIAS=3V and 8μA at
VBIAS=6.5V.
In the latch-off mode, some additional current will be drawn
from the bias supply. This additional latching current is also a
function of bias voltage and temperature (see typical performance
curves).
The MSK 5922RH current limit function is directly affected by
the input and output voltages. Custom current limit is available;
contact the factory for more information.
INPUT POWER SUPPLY BYPASSING
To maximize transient response and minimize power supply
transients it is recommended that two 47μF tantalum capacitors
are connected between VIN and ground. A 0.1μF ceramic ca-
pacitor should also be used for high frequency bypassing. See
typical application circuit.
OUTPUT CAPACITOR SELECTION
Low ESR output capacitors are required to maintain regulation
and stability. Four CWR29FB227 (AVX PN TAZH227K010L)
tantalum capacitors in parallel with ceramic decoupling capaci-
tors (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.
3
Rev. H 6/11
APPLICATION NOTES CONT.
THERMAL LIMITING
The MSK 5922RH 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 5922RH. 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 5922RH, the follow-
ing 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
FIGURE 2
=
=
=
=
=
=
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=(V
IN
-V
OUT
) 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
The MSK 5922RH is nearly identical to the MSK
5920RH. It is manufactured with the same materials and
component lots that are used in and have been TID tested
in the MSK 5920RH. The MSK5920RH TID radiation re-
port is used to provide TID characterization data fo the
MSK 5922RH.
Radiation performance curves for TID testing have been
generated for all radiation testing performed by MS
Kennedy. These curves show performance trends through-
out the TID test process and can be located in the MSK
5920RH 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
Example:
An MSK 5922-2.5RH is connected for V
IN
=+3.3V and
V
OUT
=+2.5V. I
OUT
is a continuous 3A DC level. The am-
bient temperature is +25°C. The maximum desired junc-
tion 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
= 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
Rev. H 6/11
TYPICAL PERFORMANCE CURVES
5
Rev. H 6/11
