TYPICAL APPLICATIONS
4707 Dey Road Liverpool, N.Y. 13088
(315) 701-6751
MIL-PRF-38534 CERTIFIED
5920RH
SERIES
M.S.KENNEDY CORP.
FEATURES:
Satellite System Power Supplies
Switching Power Supply Post Regulators
Constant Voltage/Current Regulators
Microprocessor Power Supplies
RAD TOLERANT
ULTRA LOW DROPOUT
POSITIVE LINEAR REGULATOR
EQUIVALENT SCHEMATIC
TYPICAL APPLICATIONS
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.
PIN-OUT INFORMATION
VIN
GND
VOUT
SHUTDOWN
N/C
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
1
2
3
4
5
Rev. G 1/06
1
Input Voltage Range
Quiescent Current
Output Voltage Tolerance
Line Regulation
Load Regulation
Dropout Voltage
Output Current Limit
Shutdown Threshold
Ripple Rejection
Thermal Resistance
Storage Temperature Range
Lead Temperature Range
(10 Seconds)
Power Dissipation
Junction Temperature
ABSOLUTE MAXIMUM RATINGS
+10V
5A
-55C to +125C
-40C to +85C
Supply Voltage
Output Current
Case Operating Temperature Range
MSK5920K/H/E RH
MSK5920RH
-65C to +150C
300C
See SOA Curve
150C
1
2
3
4
5
6
7
8
9
10
11
T
ST
T
LD
P
D
T
C
+V
IN
I
OUT
T
C
Unless otherwise specified, V
IN
=V
OUT
+1V, V
SHUTDOWN
=0V and I
OUT
=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 T
C
=+25C
Subgroup 2,5 T
C
=+125C
Subgroup 3,6 T
A
=-55C
Output current limit is dependent upon the values of V
IN
and V
OUT
. 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.
V
IN
shall be as specified or V
IN
min., whichever is greater.
Not applicable to versions where V
IN
= V
IN
Min.
Consult factory for post radiation limits.
NOTES:
Group A
Subgroup
1
2,3
1
2,3
1
2,3
1
2,3
1
2,3
1
2,3
1
2,3
1
2,3
4
5,6
-
10mA
I
OUT
1.0A
V
IN
=6.5V
Not including I
OUT
V
IN
=V
OUT
+1V
I
OUT
=1A
I
OUT
=50mA
V
OUT
+0.4V
V
IN
V
OUT
+1.3V
50mA
I
OUT
3.0A
V
IN
=
V
OUT
+1V
Delta V
OUT
=1% I
OUT
=2.5A
V
IN
=V
OUT
+1V Overcurrent Latch Up
V
OUT
0.2V (OFF)
V
OUT
=Nominal (ON)
f=120Hz
I
OUT
=
50mA
Junction to Case @ 125C Output Device
Typ.
-
-
14
14
0.1
-
0.1
-
0.06
-
0.22
0.26
-
-
1.3
1.3
-
-
2.2
Test Conditions
Max.
6.5
6.5
20
20
1.0
2.5
0.50
2.5
0.80
2.5
0.40
0.40
5
5
1.6
1.6
-
-
4.0
Min.
2.9
2.9
-
-
-
-
-
-
-
-
-
-
3.0
3.0
1.0
1.0
65
65
-
Min.
2.9
-
-
-
-
-
-
-
-
-
-
-
3.0
-
1.0
-
65
-
-
Max.
6.5
-
20
-
1.2
-
0.60
-
1.0
-
0.45
-
5
-
1.6
-
-
-
4.0
Typ.
-
-
14
-
0.1
-
0.01
-
0.06
-
0.22
-
-
-
1.3
-
-
-
2.2
V
V
mA
mA
%
%
%
%
%
%
V
V
A
A
V
V
dB
dB
C/W
MSK5920K/H/E RH
MSK5920RH
Parameter
ELECTRICAL SPECIFICATIONS
2
Units
1
2
2
7
2
8
PART NUMBER
MSK5920-1.5
MSK5920-1.9
MSK5920-2.5
MSK5920-2.8
MSK5920-3.3
MSK5920-5.0
OUTPUT VOLTAGE
+1.5V
+1.9V
+2.5V
+2.8V
+3.3V
+5.0V
9
9
9
7
Rev. G 1/06
10
11
APPLICATION NOTES
PIN FUNCTIONS
V
IN
- This pin provides power to all internal circuitry in-
cluding 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 thresh-
old 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.
V
OUT
- This is the output pin for the device.
OUTPUT CAPACITOR SELECTION
Output capacitors are required to maintain regulation
and stability. A 220F surface mount tantalum capacitor
in parallel with a 1.0F 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 0.1
to 1
.
INPUT POWER SUPPLY BYPASSING
3
FIGURE 1
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 con-
dition. To allow for start up surge currents, the timeout is
approximately 5.5mS at 25C. If the overcurrent condi-
tion 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
V
IN
off then back on. A thermal limit condition will trigger
the latch with no time out delay.
OVERCURRENT LATCH
To maximize transient response and minimize power sup-
ply transients it is recommended that a 100F tantalum
capacitor is connected between V
IN
and ground. A 0.1F
ceramic capacitor should also be used for high frequency
bypassing.
CURRENT LIMIT AND SOA
The MSK 5920RH current limit function is directly af-
fected by the input and output voltages. Figure 1 illus-
trates the relationship between V
IN
and I
CL
for various
output voltages. It is very important for the user to con-
sult the SOA curve when using input voltages which re-
sult 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.
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 in-
ternal tantalum capacitors on the input and output. MSK
does not typically use tantalum capacitors in space level
standard products of this nature.
Rev. G 1/06
APPLICATION NOTES CONT.
4
HEAT SINK SELECTION
To select a heat sink for the MSK 5920RH, the follow-
ing formula for convective heat flow may be used.
Governing Equation:
T
J
=
P
D
X (R
JC
+ R
CS
+ R
SA
) + T
A
Where
T
J
= Junction Temperature
P
D
= Total Power Dissipation
R
JC
= Junction to Case Thermal Resistance
R
CS
= Case to Heat Sink Thermal Resistance
R
SA
= Heat Sink to Ambient Thermal Resistance
T
A
= 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 150C. The equation may now be rearranged
to solve for the required heat sink to ambient thermal
resistance (R
SA
).
Example:
An MSK 5920-2.5RH 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 +25C. The maximum desired junc-
tion temperature is +125C.
R
JC
=4.0C/W and R
CS
=0.15C/W for most thermal
greases
Power Dissipation=(3.3V-2.5V) x (3A)
=2.4 Watts
Solve for R
SA:
125C - 25C
2.4W
= 36.5C/W
In this example, a heat sink with a thermal resistance
of no more than 36.5C/W must be used to maintain a
junction temperature of no more than 125C.
THERMAL LIMITING
The MSK 5920RH control circuitry has a thermal shut-
down temperature of approximately 150C. 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 150C. Proper
heat sink selection is essential to maintain these condi-
tions.
TYPICAL APPLICATIONS CIRCUIT
R
SA
= -4.0C/W - 0.15C/W
FIGURE 2
Rev. G 1/06
TYPICAL PERFORMANCE CURVES
5
Rev. G 1/06
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