MIL-PRF-38534 CERTIFIED
M.S.KENNEDY CORP.
RAD TOLERANT ULTRA LOW
DROPOUT ADJUSTABLE
POSITIVE LINEAR REGULATOR
5910RH
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 with Lead Forming
Low Input Voltage for Maximum Efficiency
Up to 5A Output Current
Available to DSCC SMD #5962-05220
DESCRIPTION:
The MSK 5910RH is a rad tolerant 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
MSK 5910RH is radiation tolerant 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
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
7
8
9
10
1
VINA
VINB
VINC
VIND
VINE
VBIAS
GND1
GND1
Latch
Shutdown
20
19
18
17
16
15
14
13
12
11
VOUTE
VOUTD
VOUTC
VOUTB
VOUTA
NC
GND2
GND2
GND2
FB
Rev. I 3/06
9
ABSOLUTE MAXIMUM RATINGS
+VBIAS
+VIN
IOUT
TC
Bias Supply Voltage
10.0V
Supply Voltage
10.0V
Output Current 7
5A
Case Operating Temperature Range
MSK5910K/H/E RH
-55°C to +125°C
MSK5910RH
-40°C to +85°C
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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
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ELECTRICAL SPECIFICATIONS
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
2.8
5.0
7.5
2.8
5.0
7.5
V
IOUT = 1.0A R1=187Ω
1
1.225
1.265
1.265
1.328
V
2,3
1.225
-
1.305
-
-
-
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
VBIAS=7.5V
1,2,3
-
2
4
-
2
4
mA
IOUT=10mA 2.8V ≤ VIN ≤ 7.5V
1
-
R1=187Ω
2,3
-
10mA ≤ IOUT ≤ 1.0A
1
-
R1=976
2,3
-
-
Feedback Voltage
Feedback Pin Current 2
Bias Current
Line Regulation
Load Regulation
Dropout Voltage
7
1.305 1.202
±0.01 ±0.50
-
0.01
±0.50
-
-
±0.06 ±0.80
-
0.06
±0.80
-
-
-
%VOUT
-
±0.60 %VOUT
-
%VOUT
±1.0 %VOUT
1
-
0.11
0.40
-
0.11
0.45
V
2,3
-
0.14
0.40
-
-
-
V
2.8V ≤ 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
1.3
1.6
1.0
1.3
1.6
V
Delta FB=1% IOUT=1.0A
Minimum Output Current 2
Output Current Limit
Units
Min.
Input Bias Voltage 2
Output Voltage Range 2
MSK5910
Subgroup
Input Voltage Range 2
Quiescent Current
MSK5910K/H/E
Group A
Test Conditions 1 8
Parameter 8
Shutdown Threshold
VOUT ≤ 0.2V (OFF)
1
1.0
VOUT=Nominal (ON)
2,3
1.0
1.3
1.6
-
-
-
V
Shutdown Hysteresis
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
Ripple Rejection 2
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
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.
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
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 Contact factory for post radiation limits.
9 Continuous operation at or above absolute maximum ratings may adversely effect the device performance and/or life cycle.
2
Rev. I
3/06
APPLICATION NOTES
START UP OPTIONS
PIN FUNCTIONS
The MSK 5910RH starts up and begins regulating immediately
when VBIAS and VIN are applied simultaneously. Applying VBIAS
before VIN starts the MSK 5910RH 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).
VIN A,B,C,D,E - These pins provide the input power connection
to the MSK 5910RH. This is the supply that will be regulated to
the output. All five pins must be connected for proper operation.
VBIAS - This pin provides power to all internal circuitry including
bias, start-up, thermal limit and overcurrent latch. VBIAS voltage range is 2.8V 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 MSK 5910RH 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 timeout 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. Holding the latch pin low disables current limiting. 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.
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 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
As previously mentioned, the LATCH pin provides over current/output short circuit protection with a timed latch-off 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 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 latching current
curve).
The MSK 5910RH current limit function is directly affected by
the input and output voltages. Custom current limit is available;
contact the factory for more information.
Typically, large bulk capacitance is required at the output of a
linear regulator to maintain good load transient response. However, with the MSK 5910RH 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.
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
Rev. I 3/06
APPLICATION NOTES CONT.
TYPICAL APPLICATIONS CIRCUIT
THERMAL LIMITING
The MSK 5910RH 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 5910RH, 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 5910RH 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=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 -8.5°C/W - 0.15°C/W
1.7W
= 50.2°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.
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. I 3/06
TYPICAL PERFORMANCE CURVES
5
Rev. I 3/06
RADIATION PERFORMANCE CURVES
6
Rev. I 3/06
MECHANICAL SPECIFICATIONS
WEIGHT=3.5 GRAMS TYPICAL
NOTE: ALL DIMENSIONS ARE ±0.010 INCHES UNLESS OTHERWISE LABELED.
ESD Triangle indicates pin 1.
ORDERING INFORMATION
PART NUMBER
SCREENING LEVEL
MSK5910RH
INDUSTRIAL
MSK5910ERH
EXTENDED RELIABILITY
MSK5910HRH
MIL-PRF-38534 CLASS H
MSK5910KRH
MIL-PRF-38534 CLASS K
DSCC SMD
5962-05220
LEADS
STRAIGHT
NOTE: See DSCC SMD 5962-05220 for DSCC part number options.
7
Rev. I 3/06
MECHANICAL SPECIFICATIONS CONTINUED
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
MSK5910RHG
INDUSTRIAL
MSK5910ERHG
EXTENDED RELIABILITY
MSK5910HRHG
MIL-PRF-38534 CLASS H
MSK5910KRHG
MIL-PRF-38534 CLASS K
DSCC SMD
5962-05220
LEADS
GULL
WING
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.
8
Rev. I 3/06