MIL-PRF-38534 CERTIFIED
M.S.KENNEDY CORP.
RAD TOLERANT ULTRA LOW
DROPOUT ADJUSTABLE
POSITIVE LINEAR REGULATOR
5900RH
4707 Dey Road Liverpool, N.Y. 13088
(315) 701-6751
FEATURES:
Total Dose Tested to 300K RAD
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 to DSCC SMD # 5962-05220
DESCRIPTION:
The MSK 5900RH is a rad tolerant adjustable linear regulator capable of delivering 4.0 amps of output current.
Typical dropout is only 0.30 volts with a 1.5 amp load. 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
MSK 5900RH is radiation tolerant to 300K RAD and specifically designed for many space/satellite applications. The
device is packaged in a hermetically sealed 12 pin flatpack that is lead formed for surface mount applications.
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
6
1
VIN A
VIN B
VIN C
GND 1
Latch
Shutdown
12
11
10
9
8
7
VOUT A
VOUT B
VOUT C
GND 2
GND 2
FB
Rev. F 2/06
10
ABSOLUTE MAXIMUM RATINGS
+VIN
IOUT
TC
Supply Voltage
+10V
Output Current 7
4A
Case Operating Temperature Range
MSK5900RH K/H/E
-55°C to +125°C
MSK5900RH
-40°C to +85°C
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
TST
TLD
○
○
○
○
○
PD
TC
○
○
○
Storage Temperature Range -65°C to +150°C
Lead Temperature Range
300°C
(10 Seconds)
Power Dissipation
See SOA Curve
Junction Temperature
150°C
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
ELECTRICAL SPECIFICATIONS
Input Voltage Range 2 8
Feedback Pin Current 2
Quiescent Current
Line Regulation
VFB=1.265V 10mA ≤ IOUT ≤ 1.0A
Dropout Voltage
Output Voltage Range 2
7
Shutdown Threshold
Shutdown Hysteresis
Ripple Rejection 2
Typ.
Max.
Min.
Typ.
Max.
1
2.8
-
7.5
2.8
-
7.5
V
7.5
-
2,3
2.8
-
1
1.225
1.265
2,3
1.225
-
1.305
1,2,3
0
-
-
-
V
1.265
1.328
V
-
-
-
V
5.0
0
-
5.0
µA
1.305 1.202
1
-
14
20
-
14
20
mA
-
14
20
-
-
-
mA
IOUT=10mA 2.8V ≤ VIN ≤ 7.5V
1
-
-
0.01
R1=187Ω
2,3
-
±0.50
-
-
±0.06 ±0.80
±0.01 ±0.50
-
±0.60 %VOUT
-
%VOUT
1
-
-
0.06
2,3
-
-
±0.80
-
-
-
%VOUT
1
-
0.22
0.70
-
0.22
0.75
V
2,3
-
0.26
0.70
-
-
-
V
2.8V ≤ VIN ≤ 7.5V
1
-
8
10
-
8
10
mA
R1=187Ω
2,3
-
9
10
-
-
-
mA
VIN=7.5V
-
1.5
-
6.8
1.5
-
6.7
V
VIN=4.4V VOUT=3.3V
1
1.5
1.75
2.0
1.3
1.75
2.2
A
±1.0 %VOUT
2,3
1.3
1.75
2.2
-
-
-
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
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
4,5,6
30
70
-
30
70
-
degrees
4,5,6
10
18
-
10
18
-
dB
Referred to Feedback Pin
4,5,6
-
-
50
-
-
50
µVRMS
Junction to Case @ 125°C Output Device
-
-
6.9
7.5
-
6.9
7.8
°C/W
Gain Margin 2
Thermal Resistance 2
Min.
2,3
Phase Margin 2
Equivalent Noise Voltage 2
Units
Subgroup
VIN=7.5V
Delta FB=1% IOUT=1.0A
Minimum Output Current 2
MSK5900
Not Including IOUT
10mA ≤ IOUT ≤ 1.0A
Load Regulation
Output Current Limit
10mA ≤ IOUT ≤ 1.0A
10mA ≤ IOUT ≤ 1.0A R1=187Ω
Feedback Voltage
MSK5900K/H/E
Group A
Test Conditions 1 9
Parameter
NOTES:
1
2
3
4
5
6
7
8
9
10
Unless otherwise specified, VIN=5.0V, R1=1.62K, VSHUTDOWN=0V and IOUT=10mA. See Figure 2.
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" 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.
Minimum VIN at -55°C and IOUT=1.0A is 4.0V due to current limit circuitry.
Consult factory for post radiation limits.
Continuous operation at or above absolute maximum ratings may adversely effect the device performance and/or life cycle.
2
Rev. F 2/06
APPLICATION NOTES
PIN FUNCTIONS
OUTPUT CAPACITOR SELECTION
Typically, large bulk capacitance is required at the
output of a linear regulator to maintain good load transient response. However, with the MSK 5900RH this is
not the case. A 47µF surface mount tantalum capacitor
in parallel with a 0.1µF 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.
VIN A,B,C - These pins provide power to all internal
circuitry including bias, start-up, thermal limit and
overcurrent latch. Input voltage range is 2.8V to 7.5V.
All three pins must be connected for proper operation.
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 MSK 5900RH has a timed latch-off circuit
which provides overcurrent protection. An overcurrent
or output short condition will saturate the internal drive
transistor. The time-out latch will then be triggered and
turn off the regulator. The time-out period is determined
by an external capacitor connected between the latch
and GND pins. Once the overcurrent condition is removed,
the latch can be reset by pulling the SHUTDOWN pin
high, grounding the LATCH pin or cycling power off,
then on. Under normal conditions, the voltage at the
LATCH pin is zero. When the device is latched off, the
voltage at the LATCH pin will be 1.6V at 25°C.
OVERCURRENT LATCH-OFF/LATCH PIN
CAPACITOR SELECTION
As previously mentioned, the LATCH pin provides over
current/output short circuit protection with a timed latchoff circuit. 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 input voltage and
temperature (see latch charging current curve). For instance, at 25°C, the latch charging current is 7.2µA at
VIN=3V and 8µA at VIN=7V.
In the latch-off mode, some additional current will be
drawn from the input. This additional latching current is
also a function of input voltage and temperature (see
latching current curve).
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 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.
FIGURE 1
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 - These are the output pins for the device.
All three pins must be connected for proper operation.
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.
The MSK 5900RH current limit function is directly
affected by the input and output voltages. Figure 1
illustrates the relationship between VIN and ICL for three
output voltages.
3
Rev. F
2/06
APPLICATION NOTES CONT.
THERMAL LIMITING
TYPICAL APPLICATIONS CIRCUIT
The MSK 5900RH 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 5900RH, 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
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).
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
VOUT -1
1.265
Table 1 below lists some of the most probable resistor
combinations based on industry standard usage.
Example:
An MSK 5900RH 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.
TABLE 1
RθJC=7.5°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 -7.5°C/W - 0.15°C/W
1.7W
= 51.2°C/W
In this example, a heat sink with a thermal resistance
of no more than 51°C/W must be used to maintain a
junction temperature of no more than 125°C.
4
OUTPUT
VOLTAGE
(V)
R2
(Ω
Ω)
R1 (nearest 1%)
Ω)
(Ω
1.5
1K
187
1.8
1K
422
2.0
1K
576
2.5
1K
976
2.8
1K
1.21K
3.3
1K
1.62K
4.0
1K
2.15K
5.0
1K
2.94K
Rev. F
2/06
TYPICAL PERFORMANCE CURVES
5
Rev. F 2/06
RADIATION PERFORMANCE CURVES
6
Rev. F 2/06
MECHANICAL SPECIFICATIONS
MSK5900RH
WEIGHT=3.3 GRAMS TYPICAL
ALL DIMENSIONS ARE ±0.010 INCHES UNLESS OTHERWISE LABELED.
ESD Triangle indicates pin 1.
ORDERING INFORMATION
Part
Number
Screening Level
MSK5900RH
INDUSTRIAL
MSK5900ERH
EXTENDED RELIABILITY
MSK5900HRH
MIL-PRF-38534 CLASS H
MSK5900KRH
MIL-PRF-38534 CLASS K
DSCC SMD
5962-05220
The above example is a Military grade hybrid.
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. F 2/06