MIL-PRF-38534 CERTIFIED FACILITY
M.S.KENNEDY CORP.
RAD HARD
ULTRA LOW DROPOUT
POSITIVE LINEAR REGULATOR
5922RH
4707 Dey Road Liverpool, N.Y. 13088
SERIES
(315) 701-6751
FEATURES:
Total Dose Hardened to 100 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
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
PIN-OUT INFORMATION
Satellite System Power Supplies
Switching Power Supply Post Regulators
Constant Voltage/Current Regulators
Microprocessor Power Supplies
1 VIN
2 VBIAS
3 VOUT
4 GND
5 LATCH
CASE=ISOLATED
1
8548-9 Rev. I 12/11
8
ABSOLUTE MAXIMUM RATINGS
+VBIAS Bias Supply Voltage
+10V
+VIN Supply Voltage
+10V
IOUT
Output Current 7
5A
TC
Case Operating Temperature Range
MSK5922K/H RH
-55°C to +125°C
MSK5922RH
-40°C to +85°C
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TST
TLD
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PD
TC
Storage Temperature Range -65°C to +150°C
300°C
Lead Temperature Range
(10 Seconds)
See SOA Curve
Power Dissipation
150°C
Junction Temperature
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ELECTRICAL SPECIFICATIONS
Max.
Min.
Typ.
Max.
10mA ≤ IOUT ≤ 1.0A
1,2,3
Note 10
-
6.5
Note 10
-
6.5
V
VBIAS ≥ VIN
1,2,3
2.9
5.0
6.5
2.9
5.0
6.5
V
IIN+IBIAS, VBIAS=VIN=6.5V, Not including IOUT
1,2,3
-
14
20
-
14
20
mA
VBIAS=6.5V
1,2,3
-
2
4
-
2
4
mA
1
-
±0.1
±0.5
-
±0.1
±1.0
%
2,3
-
-
±2.5
-
-
-
%
1
-
-
±4.0
-
-
±4.5
%
Output Voltage Tolerance
Line Regulation 9
Load Regulation 9
Dropout Voltage 11
Thermal Resistance
VIN=VOUT+1V
IOUT=1A
IOUT=50mA
1
-
±0.1
±0.50
-
0.01
±0.60
%
2,3
-
-
±2.5
-
-
-
%
50mA ≤ IOUT ≤ 3.0A
1
-
±0.06 ±0.80
-
0.06
±1.0
%
VIN = VOUT+1V
2,3
-
-
±2.5
-
-
-
%
Pin 5(Latch)=GND
7 9
2
Post Radiation
VOUT+0.4V ≤ VIN ≤ 6.5V
Delta VOUT=1%
2
IOUT=2.5A
IOUT=0.5A
7
8
9
10
11
12
1
-
0.22
0.40
-
0.22
0.45
V
2,3
-
0.26
0.40
-
-
-
V
1
-
0.11
0.30
-
0.11
0.30
V
2,3
-
0.12
0.30
-
-
-
V
1
3.0
-
5
3.0
-
5
A
2,3
3.0
-
5
-
-
-
A
f=120Hz
4
65
-
-
65
-
-
dB
IOUT = 50mA
5,6
65
-
-
-
-
-
dB
Junction to Case @ 125°C Output Device
-
-
2.2
3.0
-
2.2
3.5
°C/W
VIN=VOUT+1V Overcurrent Latch Up
NOTES:
1
2
3
4
5
6
Units
Typ.
Bias Current
Output Current Limit
MSK5922RH
Min.
Input Bias Voltage 2
Quiescent Current
MSK5922K/H RH
Subgroup
Input Voltage Range 2
Ripple Rejection
Group A
Test Conditions 1 9 12
Parameter
PART NUMBER
OUTPUT VOLTAGE
MSK5922-1.5
+1.5V
MSK5922-1.9
+1.9V
MSK5922-2.5
+2.5V
MSK5922-2.8
+2.8V
MSK5922-3.3
+3.3V
MSK5922-5.0
+5.0V
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
8548-9 Rev. I 12/11
APPLICATION NOTES
PIN FUNCTIONS
START UP OPTIONS
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.
The MSK 5922RH starts up and begins regulating immediately when VBIAS and VIN are applied simultaneously. Applying 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.
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 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 (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 disables 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.
START UP CURRENT
VOUT - This is the output pin for the device.
The MSK 5922RH 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.
INPUT POWER SUPPLY BYPASSING
http://www.mskennedy.com/
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 capacitor should also be used for high frequency bypassing. See
typical application circuit.
OVERCURRENT LATCH-OFF/LATCH PIN CAPACITOR
SELECTION
GND - Internally connected to ground, this pin should be connected externally by the user to the circuit ground.
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 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.
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 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.
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8548-9 Rev. I 12/11
APPLICATION NOTES CONT.
THERMAL LIMITING
TYPICAL APPLICATIONS CIRCUIT
The MSK 5922RH 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 MSK 5922RH. Momentarily pull the latch pin
low or cycle the power to reset the latch.
HEAT SINK SELECTION
To select a heat sink for the MSK 5922RH, 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
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
TOTAL DOSE RADIATION TEST
PERFORMANCE
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).
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 report 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 throughout 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.
Example:
An MSK 5922-2.5RH 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.
RθJC=3.0°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=
http://www.mskennedy.com/store.asp?pid=9951&catid=19680
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.
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8548-9 Rev. I 12/11
TYPICAL PERFORMANCE CURVES
5
8548-9 Rev. I 12/11
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.
6
8548-9 Rev. I 12/11
MECHANICAL SPECIFICATIONS
WEIGHT=7.7 GRAMS TYPICAL
ALL DIMENSIONS ARE ±0.010 INCHES UNLESS OTHERWISE LABELED.
ESD Triangle indicates pin 1.
ORDERING INFORMATION
MSK5922-3.3 K RH U
LEAD CONFIGURATIONS
S= STRAIGHT; U= BENT UP; D= BENT DOWN
RADIATION HARDENED
SCREENING
BLANK= INDUSTRIAL; E=EXTENDED RELIABILITY
H=MIL-PRF-38534 CLASS H; K=MIL-PRF-38534 CLASS K
OUTPUT VOLTAGE
1.5=+1.5V; 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.
M.S. Kennedy Corp.
4707 Dey Road, Liverpool, New York 13088
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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8548-9 Rev. I 12/11