MIL-PRF-38534 CERTIFIED
M.S.KENNEDY CORP.
RAD TOLERANT
ULTRA LOW DROPOUT
POSITIVE LINEAR REGULATOR
5920RH
4707 Dey Road Liverpool, N.Y. 13088
SERIES
(315) 701-6751
FEATURES:
Total Dose Tested to 300K RAD
Ultra Low Dropout for Reduced Power Consumption
External Shutdown Function
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
Replaces IR OMR9601 and IRUH33P253AIM
Available to DSCC SMD # 5962-05220
DESCRIPTION:
The MSK 5920RH is a rad tolerant 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 MSK 5920RH is radiation tolerant 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
2
3
4
5
1
VIN
GND
VOUT
SHUTDOWN
N/C
Rev. G 1/06
8
ABSOLUTE MAXIMUM RATINGS
+VIN Supply Voltage
+10V
IOUT Output Current 7
5A
TC
Case Operating Temperature Range
MSK5920K/H/E 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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Storage Temperature Range -65°C to +150°C
Lead Temperature Range
300°C
(10 Seconds)
Power Dissipation
See SOA Curve
Junction Temperature
150°C
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ELECTRICAL SPECIFICATIONS
Parameter
Input Voltage Range 2
Quiescent Current
Output Voltage Tolerance
Group A
Test Conditions 1 11
10mA ≤ IOUT ≤ 1.0A
MSK5920K/H/E RH
MSK5920RH
Units
Subgroup
Min.
Typ.
Max.
Min.
Typ.
Max.
1
2.9
-
6.5
2.9
-
6.5
V
2,3
2.9
-
6.5
-
-
-
V
VIN=6.5V
1
-
14
20
-
14
20
mA
Not including IOUT
2,3
-
14
20
-
-
-
mA
VIN=VOUT+1V
1
-
±0.1
±1.0
-
±0.1
±1.2
%
IOUT=1A
2,3
-
-
±2.5
-
-
-
%
IOUT=50mA
1
-
±0.1
±0.50
-
0.01
±0.60
%
VOUT+0.4V ≤ VIN ≤ VOUT+1.3V
2,3
-
-
±2.5
-
-
-
%
Load Regulation 9
50mA ≤ IOUT ≤ 3.0A
1
-
±0.06 ±0.80
-
0.06
±1.0
%
VIN = VOUT+1V
2,3
-
-
±2.5
-
-
-
%
Dropout Voltage 10
Delta VOUT=1% IOUT=2.5A
1
-
0.22
0.40
-
0.22
0.45
V
2,3
-
0.26
0.40
-
-
-
V
1
3.0
-
5
3.0
-
5
A
Line Regulation 9
Output Current Limit 7 9
Shutdown Threshold
Ripple Rejection 2
Thermal Resistance 2
VIN=VOUT+1V Overcurrent Latch Up
2,3
3.0
-
5
-
-
-
A
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
f=120Hz
4
65
-
-
65
-
-
dB
IOUT = 50mA
5,6
65
-
-
-
-
-
dB
Junction to Case @ 125°C Output Device
-
-
2.2
4.0
-
2.2
4.0
°C/W
PART NUMBER
OUTPUT VOLTAGE
MSK5920-1.5
+1.5V
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
NOTES:
1
2
3
4
5
6
7
8
9
10
11
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 and "E" suffix 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.
Consult factory for post radiation limits.
2
Rev. G
1/06
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 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
Overcurrent protection is provided by the MSK 5920RH
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. The latch condition
can be reset 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.
CURRENT LIMIT AND SOA
The MSK 5920RH 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
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.
REPLACING THE OMR9601/IRUH33P253AIM
When the MSK 5920-2.5RH is used as a replacement
for the IR OMR9601 or IRUH33P253AIM, the user should
recognize that the MSK 5920-2.5RH does not contain internal tantalum capacitors on the input and output. MSK
does not typically use tantalum capacitors in space level
standard products of this nature.
OUTPUT CAPACITOR SELECTION
Output capacitors are required to maintain regulation
and stability. A 220µF surface mount tantalum capacitor
in parallel with a 1.0µF ceramic capacitor from the output
to ground should suffice under most conditions. If the
user finds that tighter voltage regulation is needed during
output transients, more capacitance may be added. If more
capacitance is added to the output, the bandwidth may
suffer. ESR of the output capacitors should be maintained
at 0.1Ω to 1Ω.
3
Rev. G
1/06
APPLICATION NOTES CONT.
THERMAL LIMITING
TYPICAL APPLICATIONS CIRCUIT
The MSK 5920RH 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.
HEAT SINK SELECTION
To select a heat sink for the MSK 5920RH, 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
FIGURE 2
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 MSK 5920-2.5RH 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=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.
4
Rev. G
1/06
TYPICAL PERFORMANCE CURVES
5
Rev. G
1/06
RADIATION PERFORMANCE CURVES
NOTE: All radiation curve test conditions are in accordance with the electrical specifications table (page 2).
6
Rev. G
1/06
MECHANICAL SPECIFICATIONS
WEIGHT=7.7 GRAMS TYPICAL
ALL DIMENSIONS ARE ±0.010 INCHES UNLESS OTHERWISE LABELED.
ESD Triangle indicates pin 1.
ORDERING INFORMATION
MSK5920-3.3 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.
NOTE: See DSCC SMD 5962-05220 for DSCC part number options.
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.
Contact MSK for MIL-PRF-38534 Class H, Class K and Appendix G (radiation) status.
7
Rev. G
1/06