MIL-PRF-38534 & 38535 CERTIFIED FACILITY
RAD HARD ULTRA LOW
DROPOUT ADJUSTABLE
POSITIVE LINEAR REGULATOR
5805RH
FEATURES:
Manufactured using
Space Qualified RH1573 Die
Total Dose Hardened to 300 Krads(Si) (Method 1019.7 Condition A)
Ultra Low Dropout for Reduced Power Consumption
External Shutdown/Reset Function
Latching Overload Protection
Adjustable Output Using Two External Resistors
User Adjustable Current Limit
Surface Mount Package Available with Lead Forming
Greater than 1.0A Output Current
Non-Rad Hard EDU Version Available
DESCRIPTION:
The MSK5805RH is a rad hard adjustable linear regulator capable of delivering greater than 1.0 amp of output current.
The typical dropout is only 0.10 volts at 0.5 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 MSK5805RH is radiation hardened and specifically designed for many space/satellite applications. The device is packaged in a hermetically
sealed 16 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
1
GND2
GND2
GND2
VBIAS
IADJ1
IADJ2
VINA
VINB
9
10
11
12
13
14
15
16
VOUTA
VOUTB
VOUT SENSE
GND1
GND1 FB
LATCH
SHUT DOWN
8548-111 Rev. F 5/15
ABSOLUTE MAXIMUM RATINGS
VBIAS
VIN
VSD
IOUT
TC
8
Bias Supply Voltage
10V
Supply Voltage
10V
Shutdown Voltage
10V
Output Current 7
2A
Case Operating Temperature Range
MSK5805K/H RH
-55°C to +125°C
MSK5805RH
-40°C to +85°C
TST
TLD
PD
TC
Storage Temperature Range
Lead Temperature Range
(10 Seconds)
Power Dissipation
Junction Temperature
ESD Rating
-65°C to +150°C
300°C
See SOA Curve
150°C
Class 2
ELECTRICAL SPECIFICATIONS
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. See typical application circuit.
Guaranteed by design but not tested. Typical parameters are representative of actual device performance but are for reference only.
Industrial grade 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
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 Continuous operation at or above absolute maximum ratings may adversely effect the device performance and/or life cycle.
9 Pre and post irradiation limits @ 25°C, up to 300 Krad TID, are identical unless otherwise specified. Not applicable to EDU devices.
10 Limited by S.O.A.
2
8548-111 Rev. F 5/15
APPLICATION NOTES
PIN FUNCTIONS
POWER SUPPLY BYPASSING
VIN A,B - These pins provide the input power connection to the
MSK5805RH. This is the supply that will be regulated to the output.
Both pins must be connected for proper operation.
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.
VBIAS - This pin provides power to all internal circuitry including bias,
start-up, thermal limit and overcurrent latch. VBIAS voltage range is 2.9V
to 7.5V. VBIAS should be kept greater than or equal to VIN.
START UP OPTIONS
The MSK5805RH starts up and begins regulating immediately when
VBIAS and VIN are applied simultaneously. Applying VBIAS before VIN
starts the MSK5805RH 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).
GND1 - Internally connected to signal ground, these pins should be
connected externally by the user to the circuit ground and the GND2 pins.
LATCH - The MSK5805RH LATCH pin is used for both current limit and
thermal limit. A capacitor between the LATCH pin and ground sets a
time out delay in the event of an over current or short circuit condition.
The capacitor is charged to approximately 1.6V from a 7.2µA (nominal)
current source. Exceeding the thermal limit will charge the latch capacitor from a larger current source for a near instant shutdown. Once the
latch capacitor is charged the device latches off until the latch is reset.
Momentarily pull the LATCH pin low, toggle the shutdown pin high then
low or cycle the power to reset the latch. Toggling the shutdown pin or
cycling the bias power both disable the device during the reset operation
(see SHUTDOWN pin description). Pulling the LATCH pin low immediately enables the device for as long as the LATCH pin is held low plus
the time delay to re-charge the latch capacitor whether or not the fault
has been corrected. Disable the latch feature by tying the LATCH pin
low. With the LATCH pin held low the thermal limit feature is disabled
and the current limit feature will force the output voltage to droop but
remain active if excessive current is drawn.
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 voltage applied to the SHUTDOWN
pin can be greater than the input voltage. 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 power ground, these pins should be
connected externally by the user to the circuit ground and the GND1 pins.
VOUT A,B - These are the output pins for the device. Both pins must
be connected for proper operation.
IADJ1 AND IADJ2 - The IADJ pins provide a method to adjust the current limit. The current limit of the MSK5805RH is sensitive to the input
voltage. For lower input voltages the current limit is reduced. For higher
input voltages current limit is increased. Place a short across IADJ1 and
IADJ2 for maximum current. Place a resisitor across IADJ1 and IADJ2
to decrease the current limit.
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. Reference the LATCH
pin description note. 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 typical performance curves).
The MSK5805RH current limit function is directly affected by the input
and output voltages. Custom current limit is available; contact the factory
for more information.
Low ESR capacitance at the output is required to maintain regulation
and stability. A single 150µA (AVX PN TAZX157K010L) in parallel with
ceramic decoupling capacitance (0.01µF typical) ensure good stability
margins and transient performance for the broadest range of applications. Lower value output capacitors can also provide acceptable performance in applications with defined operating ranges. For example,
a single 47µF (AVX PN TAZH476K010L) performs well in lower current
applications. Additional frequency response compensation can be implemented with a simple RC network from pin 6 to the output or ground.
Reference the MSK5805RH Evaluation Card Application Note (AN033)
for more information.
3
8548-111 Rev. F 5/15
APPLICATION NOTES CONT'D
THERMAL LIMITING
TYPICAL APPLICATIONS CIRCUIT
The MSK5805RH 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. Exceeding the thermal limit activates the latch feature of the MSK5805RH. See
LATCH pin description for instructions to reset the latch or
disable the latch feature.
HEAT SINK SELECTION
To select a heat sink for the MSK5805RH, the following
formula for convective heat flow may be used.
VOUT=1.265(1+R1/R2)
OUTPUT VOLTAGE SELECTION
Governing Equation:
TJ = PD X (RθJC + RθCS + RθSA) + TA
Where
TJ
PD
RθJC
RθCS
RθSA
TA
=
=
=
=
=
=
As noted in the above typical applications circuit, the formula
for output voltage selection is
VOUT=1.265 1+ R1
R2
Junction Temperature
Total Power Dissipation
Junction to Case Thermal Resistance
Case to Heat Sink Thermal Resistance
Heat Sink to Ambient Thermal Resistance
Ambient Temperature
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
Power Dissipation=(VIN-VOUT) x IOUT
START UP CURRENT
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).
The MSK5805RH requires less starup current than other
RH1573 based regulators in this series. LDO regulators sink
increased current during startup to bring up the output voltage. The MSK5805RH was designed to require less starup
current making it ideal for lower current applications. The
startup current can be further reduced by placing a resistor
(RADJ) between the LADJ pins for lower current applications.
The use of RADJ decreases the saturated start up current and
the current limit of the device. Reference the "Current Limit
vs. RADJ" graph and "Saturated Start Up Current vs. Input
Volatge" graph in the typical performance curves section of
this data sheet. See AN 024 "Understanding Start Up Surge
Current With MS Kennedy's RH1573 based Rad Hard LDO
Regulators" in the application notes section of MSK's web
site for additional information.
http://www.anaren.com/msk
Example:
An MSK5805RH is connected for VIN=+5V and VOUT=+3.3V. IOUT is a continuous 0.5A DC level. The ambient
temperature is +25°C. The maximum desired junction temperature is +125°C.
RθJC=7.5°C/W and RθCS=0.15°C/W for most thermal
greases
Power Dissipation=(5V-3.3V) x (0.5A)
=0.85Watts
Solve for RθSA:
RθSA=
125°C - 25°C
0.85W
VOUT -1
1.265
- 7.5°C/W - 0.15°C/W
TOTAL DOSE RADIATION TEST
PERFORMANCE
= 110°C/W
Radiation performance curves for TID testing will be generated for all radiation testing performed by MSK. These curves
show performance trends throughout the TID test process
and can be located in the MSK5805RH radiation test report.
The complete radiation test report will be available in the RAD
HARD PRODUCTS section on the MSK website.
In this example, a heat sink with a thermal resistance of
no more than 110°C/W must be used to maintain a junction
temperature of no more than 125°C.
4
8548-111 Rev. F 5/15
TYPICAL PERFORMANCE CURVES
5
8548-111 Rev. F 5/15
TYPICAL PERFORMANCE CURVES CONT'D
SOA OUTPUT CURRENT
VS. VOLTAGE DROP
CURRENT LIMIT VS INPUT VOLTAGE
2
2
RADJ = 0Ω
1.75
100°C
IOUT (A)
125°C
CURRENT LIMIT (A)
1.5
75°C
1.5
1.25
1
1
0.5
0.75
1.5V
0
0
0.5
1
1.5
2
2.5
3
3.5
4
VIN - VOUT (V)
4.5
5
5.5
6
1.5
2.5
3
3.5
INPUT VOLTAGE (V)
4
4.5
SATURATED DRIVE CURRENT
vs. INPUT VOLTAGE
90
SATURATED DRIVE CURRENT (mA)
0.8
0.7
0.6
0.5
0.4
0.3
2.5V
1.5V
0.2
80
70
60
50
40
30
20
10
0.1
0
0
0
0.25
0.5
0.75
LOAD CURRENT (A)
1
1.25
2.5
1.5
3.5
4.5
5.5
INPUT VOLTAGE (V)
6.5
7.5
CURRENT LIMIT VS RADJ
3.0
3.3VOUT, 5.0VIN
2.5
CURRENT LIMIT (A)
DROPOUT (V)
2
100
RADJ = 0Ω
0.9
3.3V
0.5
6.5
DROPOUT VOLTAGE VS LOAD CURRENT
1
2.5V
2.0
2.5VOUT, 3.3VIN
1.5
1.5VOUT, 2.5VIN
1.0
0.5
0.0
1
10
100
1000
RADJ (Ω)
6
8548-111 Rev. F 5/15
TYPICAL PERFORMANCE CURVES CONT'D
GAIN AND PHASE RESPONSE
The gain and phase response curves are for the MSK typical application circuit and are representative of typical
device performance, but are for reference only. The performance should be analyzed for each application to insure
individual program requirements are met. External factors such as temperature, input and output voltages, capacitors, etc. all can be major contributors. Please consult factory for additional details.
100
225
80
180
80
180
60
135
60
135
40
90
40
90
20
45
20
45
0
0
0
0
-45
-40
-90
-45
-20
-40
-60
-180
-80
-225
10000
-100
100
225
100
225
80
180
80
180
60
135
60
135
40
90
40
90
20
45
20
45
0
0
0
0
-100
1
10
100
1000
1
10
FREQUENCY (kHz)
GAIN (dB)
-20
-45
-40
-90
-40
-135
-60
-180
-80
-225
10000
-100
VIN = 2.5
VOUT = 1.5V
IOUT = 0.5A
COUT = 150µF, TAZX157K010L
-60
-80
-100
1
10
100
FREQUENCY (kHz)
1000
-180
1000
-225
10000
GAIN AND PHASE vs. FREQUENCY
PHASE (deg)
GAIN (dB)
GAIN AND PHASE vs. FREQUENCY
100
FREQUENCY (kHz)
-135
-45
-20
-90
VIN = 5.0V
VOUT = 3.3V
IOUT = 0.5A
COUT = 150µF, TAZX157K010L
1
10
100
FREQUENCY (kHz)
-135
-180
1000
-225
10000
GAIN AND PHASE vs. FREQUENCY
GAIN AND PHASE vs. FREQUENCY
225
100
225
80
180
80
180
60
135
60
135
40
90
40
90
20
45
20
45
0
0
0
0
-40
VIN = 2.5
VOUT = 1.5V
IOUT = 1.0A
COUT = 150µF, TAZX157K010L
-60
-80
-100
1
10
100
FREQUENCY (kHz)
1000
GAIN (dB)
-45
PHASE (deg)
100
-20
PHASE (deg)
-80
GAIN (dB)
-90
VIN = 5.0V
VOUT = 3.3V
IOUT = 10mA
COUT = 150µF, TAZX157K010L
-135
-60
-45
-20
-90
-40
-135
-60
-180
-80
-225
10000
-100
7
-90
VIN = 5.0V
VOUT = 3.3V
IOUT = 1.0A
COUT = 150µF, TAZX157K010L
1
10
100
FREQUENCY (kHz)
PHASE (deg)
VIN = 2.5
VOUT = 1.5V
IOUT = 10mA
COUT = 150µF, TAZX157K010L
GAIN (dB)
-20
PHASE (deg)
GAIN (dB)
225
PHASE (deg)
GAIN AND PHASE vs. FREQUENCY
GAIN AND PHASE vs. FREQUENCY
100
-135
-180
1000
-225
10000
8548-111 Rev. F 5/15
TYPICAL PERFORMANCE CURVES CONT'D
GAIN AND PHASE RESPONSE
The gain and phase response curves are for the MSK typical application circuit and are representative of typical
device performance, but are for reference only. The performance should be analyzed for each application to insure
individual program requirements are met. External factors such as temperature, input and output voltages, capacitors, etc. all can be major contributors. Please consult factory for additional details.
100
225
80
180
80
180
60
135
60
135
40
90
40
90
20
45
20
45
0
0
0
0
GAIN (dB)
PHASE (deg)
-20
-45
-40
-90
-40
-135
-60
-180
-80
-225
10000
-100
-80
-100
1
10
100
FREQUENCY (kHz)
1000
1
100
FREQUENCY (kHz)
-180
1000
-225
10000
100
225
100
225
80
180
80
180
60
135
60
135
40
90
40
90
20
45
20
45
0
0
0
0
GAIN (dB)
PHASE (deg)
GAIN (dB)
10
-135
GAIN AND PHASE vs. FREQUENCY
GAIN AND PHASE vs. FREQUENCY
-45
-40
-90
-40
-135
-60
VIN = 2.5V
VOUT = 1.5V
IOUT = .25A
COUT = 47µF, TAZH476K010L
-80
-100
1
10
100
FREQUENCY (kHz)
1000
-45
-20
-20
-60
-180
-80
-225
10000
-100
-90
VIN = 5.0V
VOUT = 3.3V
IOUT = 0.25A
COUT = 47µF, TAZH476K010L
1
10
100
FREQUENCY (kHz)
-135
-180
1000
-225
10000
GAIN AND PHASE vs. FREQUENCY
GAIN AND PHASE vs. FREQUENCY
225
100
225
80
180
80
180
135
60
135
40
90
40
90
20
45
20
45
0
0
0
0
-20
-40
VIN = 2.5V
VOUT = 1.5V
IOUT = 0.5A
COUT = 47µF, TAZH476K010L
-60
-80
-100
1
10
100
FREQUENCY (kHz)
1000
GAIN (dB)
-45
PHASE (deg)
100
60
GAIN (dB)
-90
VIN = 5.0V
VOUT = 3.3V
IOUT = 10mA
COUT = 47µF, TAZH476K010L
PHASE (deg)
VIN = 2.5V
VOUT = 1.5V
IOUT = 10mA
COUT = 47µF, TAZH476K010L
-60
-45
-20
-45
-20
-90
-40
-135
-60
-180
-80
-225
10000
-100
-90
VIN = 5.0V
VOUT = 3.3V
IOUT = 0.5A
COUT = 47µF, TAZH476K010L
1
8
PHASE (deg)
GAIN (dB)
225
PHASE (deg)
GAIN AND PHASE vs. FREQUENCY
GAIN AND PHASE vs. FREQUENCY
100
10
100
FREQUENCY (kHz)
-135
-180
1000
-225
10000
8548-111 Rev. F 5/15
MECHANICAL SPECIFICATIONS
ESD TRIANGLE INDICATES PIN 1
WEIGHT=1.45 GRAMS TYPICAL
ALL DIMENSIONS ARE SPECIFIED IN INCHES
ORDERING INFORMATION
PART NUMBER
SCREENING LEVEL
MSK5805EDU
NON-RAD HARD
ENG UNITS
MSK5805RH
INDUSTRIAL
MSK5805HRH
MIL-PRF-38534 CLASS H
MSK5805KRH
MIL-PRF-38534 CLASS K
TBD
DSCC SMD
9
LEADS
STRAIGHT
8548-111 Rev. F 5/15
MECHANICAL SPECIFICATIONS CONT'D
ESD TRIANGLE INDICATES PIN 1
WEIGHT=1.45 GRAMS TYPICAL
ALL DIMENSIONS ARE SPECIFIED IN INCHES
ORDERING INFORMATION
PART NUMBER
SCREENING LEVEL
MSK5805EDUG
NON-RAD HARD
ENG UNITS
MSK5805RHG
INDUSTRIAL
MSK5805HRHG
MIL-PRF-38534 CLASS H
MSK5805KRHG
MIL-PRF-38534 CLASS K
TBD
DSCC SMD
10
LEADS
GULL
WING
8548-111 Rev. F 5/15
REVISION HISTORY
MSK
www.anaren.com/msk
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.
11
8548-111 Rev. F 5/15