ISO-9001 CERTIFIED BY DSCC
M.S.KENNEDY CORP.
RAD TOLERANT
ULTRA LOW DROPOUT
POSITIVE LINEAR REGULATOR
5920RH
SERIES
(315) 701-6751
4707 Dey Road Liverpool, N.Y. 13088
MIL-PRF-38534 CERTIFIED
FEATURES:
Total Dose Rated 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
Output Current Limit
Available in 3 Lead Form Options: Straight, Up and Down
Replaces IR OMR9601
DESCRIPTION:
The MSK 5920RH is a rad tolerant fixed linear regulator capable of delivering 3.0 amps of output current with
typical dropout of only 0.30 volts. An external shutdown function is ideal for power supply sequencing. This device
also has internal latching overload protection. The MSK 5920RH is radiation tolerant to 300K RAD and specifically
designed for many 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
GND
VOUT
SHUTDOWN
N/C
PRELIMINARY
Rev. A 4/05
ABSOLUTE MAXIMUM RATINGS
8
ELECTRICAL SPECIFICATIONS
Parameter
Input Voltage Range
2
Test Conditions
1
10mA
≤
I
OUT
≤
1.0A
Group A
Subgroup
1
2,3
Quiescent Current
V
IN
=6.5V
1
2,3
Line Regulation
9
I
OUT
=50mA
V
OUT
+0.4V
≤
V
IN
≤
V
OUT
+1.3V
Load Regulation
9
50mA
≤
I
OUT
≤
3.0A
V
IN
=
V
OUT
+1V
Dropout Voltage
Delta V
OUT
=1% I
OUT
=3.0A
1
2,3
1
2,3
1
2,3
Output Current Limit
7 9
V
IN
=V
OUT
+1V Overcurrent Latch Up
1
2,3
Shutdown Threshold
V
OUT
≤
0.2V (OFF)
V
OUT
=Nominal (ON)
Shutdown Hysteresis
Difference between voltage
threshold of V
SDI
(ON) and V
SDI
(OFF)
Ripple Rejection
2
f=120Hz
I
OUT
=
50mA
Thermal Resistance
2
Junction to Case @ 125°C Output Device
1
2,3
1
2,3
4
5,6
-
MSK5920K/H/E RH
Min.
2.9
2.9
-
-
-
-
-
-
-
-
3.0
3.0
1.0
1.0
-
-
65
65
-
Typ.
-
-
14
14
Max.
6.5
6.5
20
20
MSK5920RH
Min.
2.9
-
-
-
-
-
-
-
-
-
3.0
-
1.0
-
-
-
65
-
-
Typ.
-
-
14
-
0.01
-
0.06
-
0.22
-
-
-
1.3
-
0.02
-
-
-
2.2
Max.
6.5
-
20
-
V
V
mA
mA
Units
±0.01 ±0.50
-
±0.50
±0.60 %V
OUT
-
%V
OUT
±0.06 ±0.80
-
0.22
0.26
-
-
1.3
1.3
0.02
0.03
-
-
2.2
±0.80
0.40
0.40
5
5
1.6
1.6
0.2
0.2
-
-
4.0
±1.0 %V
OUT
-
0.45
-
5
-
1.6
-
0.2
-
-
-
4.0
%V
OUT
V
V
A
A
V
V
V
V
dB
dB
°C/W
PART NUMBER
MSK5920RH-1.5
MSK5920RH-1.9
MSK5920RH-2.5
MSK5920RH-2.8
MSK5920RH-3.3
MSK5920RH-5.0
OUTPUT VOLTAGE
+1.5V
+1.9V
+2.5V
+2.8V
+3.3V
+5.0V
NOTES:
1
2
3
4
5
6
Unless otherwise specified, V
IN
=V
OUT
+1V, V
SHUTDOWN
=0V and I
OUT
=0A. 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
=+25°C
Subgroup 2,5 T
C
=+125°C
Subgroup 3,6 T
A
=-55°C
7 Output current limit is dependent upon the values of V
IN
and V
OUT
. See Figure 1 and typical performance curves.
8 Continuous operation at or above absolute maximum ratings may adversely effect the device performance and/or life cycle.
9 V
IN
shall be as specified or V
IN
min., whichever is greater.
2
PRELIMINARY
Rev. A 4/05
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P
D
T
C
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+V
IN
Supply Voltage
+10V
I
OUT
Output Current
7
5A
T
C
Case Operating Temperature Range
MSK5920RH K/H/E
-55°C to +125°C
MSK5920RH
-40°C to +85°C
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T
ST
T
LD
Storage Temperature Range -65°C to +150°C
Lead Temperature Range
300°C
(10 Seconds)
Power Dissipation
See SOA Curve
Junction Temperature
150°C
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
1.3V 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.
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 con-
dition. To allow for start up surge currents, the timeout is
approximately 5.5mS at 25°C. 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.
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.
INPUT POWER SUPPLY BYPASSING
To maximize transient response and minimize power sup-
ply transients it is recommended that a 100µF tantalum
capacitor is connected between V
IN
and ground. A 0.1µF
ceramic capacitor should also be used for high frequency
bypassing.
REPLACING THE OMR9601
When the MSK 5920RH-2.5 is used as a replacement
for the IR OMR9601, the user should recognize that the
MSK 5920RH-2.5 does not contain internal tantalum ca-
pacitors 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.
3
PRELIMINARY
Rev. A 4/05
APPLICATION NOTES CONT.
THERMAL LIMITING
TYPICAL APPLICATIONS CIRCUIT
The MSK 5920RH 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.
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
θJC
+ R
θCS
+ R
θSA
) + T
A
Where
T
J
P
D
R
θJC
R
θCS
R
θSA
T
A
=
=
=
=
=
=
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=(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
).
Example:
An MSK 5920RH 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
=4.0°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 -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
PRELIMINARY
Rev. A 4/05
TYPICAL PERFORMANCE CURVES
5
PRELIMINARY
Rev. A 4/05
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