MIL-PRF-38534 AND 38535 CERTIFIED FACILITY
M.S.KENNEDY CORP.
RAD HARD ULTRA LOW
DROPOUT ADJUSTABLE
POSITIVE LINEAR REGULATOR
5910RH
FEATURES:
Total Dose Hardened to 100 Krads(Si) (Method 1019.7 Condition A)
Ultra Low Dropout for Reduced Power Consumption
External Shutdown/Reset Function
Latching Overload Protection
Adjustable Output Using Two External Resistors
Output Current Limit
Surface Mount Package Available with Lead Forming
Low Input Voltage for Maximum Efficiency
Up to 5A Output Current
Available as SMD 5962R05220
RAD Certified by DSCC
DESCRIPTION:
The MSK5910RH is a rad hard adjustable linear regulator capable of delivering 5.0 amps of output current. The typical
dropout is only 0.11 volts at 1 amp. An external shutdown/reset function is ideal for power supply sequencing. This device
also has latching overload protection that requires no external current sense resistor. The MSK5910RH is radiation hardened and specifically designed for many space/satellite applications. The device is packaged in a hermetically sealed 20 pin
flatpack that can be lead formed for surface mount applications.
EQUIVALENT SCHEMATIC
PIN-OUT INFORMATION
TYPICAL
APPLICATIONS
TYPICAL APPLICATIONS
1
2
3
4
5
6
7
8
9
10
Satellite System Power Supplies
Switching Power Supply Post Regulators
Constant Voltage/Current Regulators
Microprocessor Power Supplies
1
VINA
VINB
VINC
VIND
VINE
VBIAS
GND1
GND1
Latch
Shutdown
20
19
18
17
16
15
14
13
12
11
CASE=ISOLATED
VOUTE
VOUTD
VOUTC
VOUTB
VOUTA
NC
GND2
GND2
GND2
FB
8548-11 Rev. S
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8
ABSOLUTE MAXIMUM RATINGS
+VBIAS
+VIN
VSD
IOUT
TC
Bias Supply Voltage
10V
Supply Voltage
10V
Shutdown Voltage
10V
Output Current 7
5A
Case Operating Temperature Range
MSK5910K/H RH
-55°C to +125°C
MSK5910RH
-40°C to +85°C
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TST
TLD
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PD
TC
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Input Bias Voltage 2
Feedback Voltage
Bias Current
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MSK5910K/H
Group A
300°C
See SOA Curve
150°C
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MSK5910
Units
Subgroup
Min.
Typ.
Max.
Min.
Typ.
Max.
10mA ≤ IOUT ≤ 1.0A
1,2,3
2.0
-
7.5
2.0
-
7.5
V
VBIAS ≥ VIN
1,2,3
2.9
5.0
7.5
2.9
5.0
7.5
V
1
1.225
1.265
1.328
V
2,3
1.225
-
1.305
-
-
-
V
1
1.215
-
1.315
-
-
-
V
VFB=1.265V 10mA ≤ IOUT ≤ 1.0A
1,2,3
0
-
5.0
0
-
5.0
μA
IIN+IBIAS, VBIAS=VIN=7.5V Not including IOUT
1,2,3
-
14
20
-
14
20
mA
2
4
-
2
4
mA
-
0.01
±0.50
-
-
±0.06 ±0.80
-
0.06
Post Radiation
Quiescent Current
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10
IOUT = 1.0A R1=187Ω
Feedback Pin Current 2
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Test Conditions 1 9
Input Voltage Range 2
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-65°C to +150°C
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ELECTRICAL SPECIFICATIONS
Parameter
Storage Temperature Range
Lead Temperature Range
(10 Seconds)
Power Dissipation
Junction Temperature
1.265 1.305 1.202
VBIAS=7.5V
1,2,3
-
IOUT=10mA 2.9V ≤ VIN ≤ 7.5V
1
-
R1=187Ω
2,3
-
Load Regulation
10mA ≤ IOUT ≤ 1.0A
1
-
R1=976
2,3
-
-
±0.80
-
-
-
%VOUT
Dropout Voltage
Delta FB=1% IOUT=1.0A
1
-
0.11
0.40
-
0.11
0.45
V
2,3
-
0.14
0.40
-
-
-
V
2.9V ≤ VIN ≤ 7.5V
1
-
8
10
-
8
10
mA
R1=187Ω
2,3
-
9
10
-
-
-
mA
VIN=7.5V
-
1.5
-
7.0
1.5
-
7.0
V
VIN=2.5V VOUT=1.5V
1
3.2
3.6
4.0
3.2
3.6
4.0
A
2,3
3.0
-
-
-
-
-
A
Line Regulation
Minimum Output Current 2
Output Voltage Range 2
Output Current Limit
7
Shutdown Threshold
Shutdown Hysteresis
±0.01 ±0.50
-
±0.60 %VOUT
-
%VOUT
±1.0 %VOUT
VOUT ≤ 0.2V (OFF)
1
1.0
1.3
1.6
1.0
1.3
1.6
V
VOUT=Nominal (ON)
2,3
1.0
1.3
1.6
-
-
-
V
Difference between voltage
1
-
0.02
0.2
-
0.02
0.2
V
threshold of VSDI (ON) and VSDI (OFF)
2,3
-
0.03
0.2
-
-
-
V
f=1KHz to 10KHz
4
20
-
-
20
-
-
dB
10mA ≤ IOUT ≤ 1.0A 1.0V=VIN-VOUT
5,6
20
-
-
-
-
-
dB
Phase Margin 2
IOUT=450mA
4,5,6
30
80
-
30
80
-
degrees
Gain Margin 2
IOUT=45OmA
4,5,6
10
30
-
10
30
-
dB
Referred to Feedback Pin
4,5,6
-
-
50
-
-
50
μVRMS
Junction to Case @ 125°C Output Device
-
-
7.3
8.4
-
7.3
9.0
°C/W
Ripple Rejection 2
Equivalent Noise Voltage 2
Thermal Resistance 2
NOTES:
1
2
3
4
5
6
Unless otherwise specified, VBIAS=VIN=5.0V, R1=1.62K, VSHUTDOWN=0V and IOUT=10mA. IOUT is subtracted from IQ measurement. See typical application 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" 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
7 Output current limit is tested with a low duty cycle pulse to minimize junction heating and is dependent on the values of VIN, VOUT and case
temperature. See Typical Performance Curves.
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.
Reference DSCC SMD 5962R05220 for electrical specifications for devices purchased as such.
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APPLICATION NOTES
PIN FUNCTIONS
START UP OPTIONS
VIN A,B,C,D,E - These pins provide the input power connection to
the MSK5910RH. This is the supply that will be regulated to the
output. All five pins must be connected for proper operation.
The MSK5910RH starts up and begins regulating immediately when
VBIAS and VIN are applied simultaneously. Applying VBIAS before
VIN starts the MSK5910RH up in a disabled or latched state. When
starting in a latched state the device output can be enabled either by
pulling the latch pin low to drain the latch capacitor or pulsing the
shutdown pin high. The shutdown pulse duration is partially dependent upon the size of the latch capacitor and should be characterized
for each application; 30uS is typically adequate for a 1uF latch capacitor at 25°C. A momentary high pulse on the shutdown pin can be
achieved using the RC circuit below if VIN rises rapidly. The resistor
and capacitor must be selected based on the required pulse duration,
the rise characteristic of VIN and the shutdown pin threshold (see
shutdown pin threshold and current curves).
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 7.5V. VBIAS should be kept greater than or equal
to VIN.
GND1 - Internally connected to input ground, these pins should be
connected externally by the user to the circuit ground and the GND2
pins.
LATCH - The MSK5910RH 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. The capacitor is charged to approximately 1.6V from a
7.2μA (nominal) current source. Exceeding the thermal limit will
charge 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, toggle the shutdown pin high then low or cycle the power to
reset the latch. Toggling the shutdown pin or cycling the bias power
both disable the device during the reset operation (see SHUTDOWN
pin description). 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.
The shutdown pin can be held high and pulled low after VIN comes
up or the latch pin held low and released after VIN comes up to
ensure automatic startup when applying VBIAS before VIN. Either
of the basic circuits below can be adapted to a variety of applications for automatic start up when VBIAS rises before VIN.
SHUTDOWN - There are two functions to the SHUTDOWN pin. It
may be used to disable the output voltage or to reset the LATCH
pin. To activate the shutdown/reset functions the user must apply a
voltage greater than 1.3V 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.
FB - The FB pin is the inverting input of the internal error amplifier.
The non-inverting input is connected to an internal 1.265V reference. This error amplifier controls the drive to the output transistor
to force the FB pin to 1.265V. An external resistor divider is connected
to the output, FB pin and ground to set the output voltage.
GND2 - Internally connected to output ground, these pins should be
connected externally by the user to the circuit ground and the GND1
pins.
VOUT A,B,C,D,E - These are the output pins for the device. All five
pins must be connected for proper operation.
OVERCURRENT LATCH-OFF/LATCH PIN CAPACITOR
SELECTION
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 on the MSK5820RH-1.5 that screening for a maximum ESR of 57mΩ ensures EOL stability criteria to be
met for many applications with the most stringent requirements. Analysis of the final design is recommended to ensure stability requirements are met.
POWER SUPPLY BYPASSING
To maximize transient response and minimize power supply transients it is recommended that a 33μF minimum tantalum capacitor
is connected between VIN and ground. A 0.1μF ceramic capacitor
should also be used for high frequency bypassing.
3
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=7V.
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 MSK5910RH current limit function is directly affected by the
input and output voltages. Custom current limit is available; contact
the factory for more information.
8548-11 Rev. S
6/11
APPLICATION NOTES CONT.
TYPICAL APPLICATIONS CIRCUIT
THERMAL LIMITING
The MSK5910RH 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 MSK5910RH. See LATCH pin description for
instructions to reset the latch or disable the latch feature.
HEAT SINK SELECTION
To select a heat sink for the MSK5910RH, 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
VOUT=1.265(1+R1/R2)
OUTPUT VOLTAGE SELECTION
As noted in the above typical applications circuit,
the formula for output voltage selection is
VOUT=1.265 1+ R1
R2
A good starting point for this output voltage selection is
to set R2=1K. By rearranging the formula it is simple to
calculate the final R1 value.
R1=R2
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).
Example:
An MSK5910RH is connected for VIN=+5V and
VOUT=+3.3V. IOUT is a continuous 1A DC level. The
ambient temperature is +25°C. The maximum desired
junction temperature is +125°C.
RθJC=8.5°C/W and RθCS=0.15°C/W for most thermal
greases
Power Dissipation=(5V-3.3V) x (1A)
=1.7Watts
Solve for RθSA:
RθSA= 125°C - 25°C -8.4°C/W - 0.15°C/W
1.7W
= 50.3°C/W
In this example, a heat sink with a thermal resistance
of no more than 50°C/W must be used to maintain a
junction temperature of no more than 125°C.
VOUT -1
1.265
START UP CURRENT
The MSK5910RH 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/
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 MSK5910RH 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
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8548-11 Rev. S
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TYPICAL PERFORMANCE CURVES
5
8548-11 Rev. S
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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.
6
8548-11 Rev. S
6/11
TYPICAL PERFORMANCE CURVES CONT'D
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.
7
8548-11 Rev. S
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MECHANICAL SPECIFICATIONS
ESD TRIANGLE INDICATES PIN 1
WEIGHT=3.5 GRAMS TYPICAL
ALL DIMENSIONS ARE SPECIFIED IN INCHES
ORDERING INFORMATION
PART NUMBER
SCREENING LEVEL
MSK5910RH
INDUSTRIAL
MSK5910HRH
MIL-PRF-38534 CLASS H
MSK5910KRH
MIL-PRF-38534 CLASS K
5962R05220
DSCC SMD
8
LEADS
STRAIGHT
8548-11 Rev. S
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MECHANICAL SPECIFICATIONS CONTINUED
ESD TRIANGLE INDICATES PIN 1
WEIGHT=3.3 GRAMS TYPICAL
ALL DIMENSIONS ARE SPECIFIED IN INCHES
ORDERING INFORMATION
PART NUMBER
SCREENING LEVEL
MSK5910RHG
INDUSTRIAL
MSK5910HRHG
MIL-PRF-38534 CLASS H
MSK5910KRHG
MIL-PRF-38534 CLASS K
5962R05220
DSCC SMD
9
LEADS
GULL
WING
8548-11 Rev. S
6/11
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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