MSK5965RH - M.S. Kennedy Corp.

MIL-PRF-38534 AND 38535 CERTIFIED FACILITY
RAD HARD POSITIVE,
0.9A, LOW NOISE, LDO
ADJ VOLTAGE REGULATOR
5965RH
FEATURES:
Manufactured using
Space Qualified RH1965 Die
MIL-PRF-38534 Class K and H Processing & Screening
Total Dose Hardened to TBD Krads(Si) (Method 1019.7 Condition A)
Low Dropout of 250mV at 0.5A
Output Adjustable from 1.2V to 19.5V
Internal Short Circuit Current Limit
Low Noise: 40uVRMS (10Hz to 100kHz)
Output Current Capability < 0.9A
Internal Thermal Overload Protection
Shutdown Pin Active Low
Available in Straight or Gull Wing Lead Form
Contact MSK for MIL-PRF-38534 Qualification Status
DESCRIPTION:
The MSK5965RH is a radiation hardened low dropout adjustable linear regulator. This device features a low noise, adjustable output voltage range of 1.2V to 19.5V. The dropout voltage is typically 250mV with a 0.5A load. This, combined with
the low RθJC, allows increased output current while providing exceptional device efficiency. Additionally, the MSK5965RH
offers internal short circuit current and thermal limiting, which provides circuit protection and eliminates the need for excessive derating. The shutdown pin provides a method for sequencing the supply with minimal external components. The
MSK5965RH is packaged in a hermetically sealed 10 pin flatpack with straight or gull wing leads and specifically designed
for space/satellite applications.
EQUIVALENT SCHEMATIC
TYPICAL APPLICATIONS
PIN-OUT INFORMATION
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2
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High Efficiency Linear Regulators
Constant Voltage/Current Regulators
Space System Power Supplies
Switching Power Supply Post Regulators
Very low Voltage Power Supplies
Low Noise Instrumentation
GND
VOUT
VOUT
VOUT
ADJ
10
9
8
7
6
NC
VIN
VIN
VIN
SHDN
CASE=ISOLATED
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PRELIMINARY Rev. B 9/15
ABSOLUTE MAXIMUM RATINGS
VIN
VOUT
IOUT
ADJ
SHDN
Pin Voltage
Pin Voltage
Input to Output Differential Voltage
Outout Current
Pin Voltage
Pin Voltage ±22V
8 9 10
1
±22V
±22V
±22V
+0.9A
±9V
±22V
TST
TLD
TC
Storage Temperature Range
Lead Temperature Range
(10 Seconds)
Case Operating Temperature
MSK5965RH
MSK5965K/HRH
ESD Rating
-65°C to +150°C
300°C
-40°C to +85°C
-55°C to +125°C
Class 3A
ELECTRICAL SPECIFICATIONS
NOTES:
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U.O.S. VOUT= 2.5V, VIN= 6V, ILOAD= 1mA
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 subgroup 1 unless otherwise specified.
Subgroup 1 TA = TC = +25°C
Subgroup 2 TA = TC = +125°C
Subgroup 3 TA = TC = -55°C
GND Pin current increases in Dropout.
ADJ pin bias current flows into the ADJ pin.
Reverse output current is tested with the VIN pin grounded and the VOUT pin forced to 1.2V. This current flows into the VOUT pin and out of the GND pin.
Absolute maximum input to output differential voltage is not achievable with all combinations of rated VIN pin and VOUT pin voltages. With the VIN pin
at 22V, the VOUT pin may not be pulled below 0V. The total measured voltage from VIN to VOUT must not exceed ±22V.
Maximum junction temperature limits operating conditions. The regulated output voltage specification does not apply for all possible combinations of
input voltage and output current. Limit the output current range if operating at the maximum input voltage. Limit the input to output voltage differential
if operating at the maximum output current.
Continuous operation at or above absolute maximum ratings may adversely affect the device performance and/or life cycle.
Pre and Post irradiation limits at 25°C, up to 300 Krad(Si) TID, are identical unless otherwise specified.
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PRELIMINARY Rev. B 9/15
APPLICATION NOTES
PIN FUNCTIONS
VIN - The VIN pins are the input supply pins for all of the internal circuitry. Decoupling capacitors are recommended to provide a low impedance
source. All three pins must be connected for proper operation.
With a high input voltage, a problem can occur wherein removal of an
output short will not allow the output to recover. Other regulators, such as
the LT1083/LT1084/LT1085 family, also exhibit this phenomenon, so it is
not unique to the MSK5965RH. The problem occurs with a heavy output
load when the input voltage is high and the output voltage is low. Common
situations occur immediately after the removal of a short-circuit or if the
shutdown pin is pulled high after the input voltage has already been turned
on. The load line for such a load may intersect the output current curve
at two points. If this happens, there are two stable output operating points
for the regulator. With this double intersection, the input power supply may
need to be cycled down to zero and brought up again to make the output
recover.
GND - Connect the bottom of the output voltage feedback divider directly
to GND for optimum regulation. Connect the GND pin to the load ground
trace outside of the primary power return path.
VOUT - The VOUT pins supply power to the load. A 10µF capacitor on
the output with an ESR of less than 1Ω is typically adequate to ensure
stability. Applications with large output load transients require larger output
capacitor value to minimize output voltage transients. All VOUT pins must
be connected for proper operation.
HEAT SINK SELECTION
ADJ - The Adjust pin is the input to the error amplifier. Connect to the
center of the output voltage feedback divider. The ADJ pin voltage is 1.2V
referenced to GND. It has a typical bias current of 1.3µA that flows into
the pin.
To select a heat sink for the MSK5965RH, the following formula for convective heat flow may be used.
Governing Equation:
SHDN - Pulling the SHDN pin low puts the device into a low power state
and turns the output off. Drive the SHDN pin with either logic or an open
collector/drain with a pull-up resistor. If unused, connect the SHDN pin to
VIN. The SHDN pin cannot be driven below GND unless it is tied to the
VIN pin. If the SHDN pin is driven below GND while VIN is powered, the
output will turn on. SHDN pin logic cannot be referenced to a negative
supply rail.
TJ = PD x (RθJC + RθCS + RθSA) + TA
WHERE
TJ = Junction Temperature
PD = Total Power Dissipation
RθJC = Junction to Case Thermal Resistance
RθCS = Case to Heat Sink Thermal Resistance
RθSA = Heat Sink to Ambient Thermal Resistance
TA = Ambient Temperature
TYPICAL APPLICATION CIRCUIT
Power Dissipation = ((VIN-VOUT) x IOUT ) + (IGND x VIN)
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).
EXAMPLE:
An MSK5965RH is connected for VIN = +5V and VOUT = +3.3V. IOUT is
a continuous 0.5A DC level and IGND=20mA. The ambient temperature is
+25°C. The maximum desired junction temperature is +125°C.
Power Dissipation =((5V-3.3V) (0.5A)) + (0.02A x 5V)=0.95Watts
RθJC = 12.08°C/W and RθCS = 0.15°C/W for a most thermal grease.
Solve for RθSA:
FIGURE 1
125°C - 25°C -12.08°C/W - 0.15°C/W = 93.3°C/W
0.95W
OUTPUT VOLTAGE SELECTION
As noted in the above typical applications circuit, the formula for output
voltage selection is:
VOUT=VADJ x 1+
In this example, a heat sink with a thermal resistance of no more than
93.0°C/W must be used to maintain a junction temperature of no more
than 125°C.
R1
+ IADJ x R1
R2
TOTAL DOES RADIATION TEST PERFORMANCE
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 MSK5965RH
radiation test report. The complete radiation test report will be available in
the RAD HARD PRODUCTS section on the MSK website.
OVERLOAD RECOVERY
Like many IC power regulators, the MSK5965RH has safe operating area
protection. The safe operating area protection decreases current limit as
the input-to-output voltage increases and keeps the power transistor inside
a safe operating region for all values of input-to-output voltage. The protective design provides some output current at all values of input-to-output
voltage up to the device breakdown. When power is first applied, as input
voltage rises, the output follows the input, allowing the regulator to start
up into very heavy loads. During start-up, as the input voltage is rising, the
input-to-output voltage differential is small, allowing the regulator to supply
large output currents.
ADDITIONAL APPLICATION
For additional applications information, please reference Linear Technology Corporation's® LT1965 and RH1965 data sheets.
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PRELIMINARY Rev. B 9/15
TYPICAL PERFORMANCE CURVES
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PRELIMINARY Rev. B 9/15
MECHANICAL SPECIFICATIONS
ESD TRIANGLE INDICATES PIN 1
WEIGHT=0.37 GRAMS TYPICAL
ALL DIMENSIONS ARE SPECIFIED IN INCHES
ORDERING INFORMATION
MSK5965 K RH LEAD CONFIGURATIONS
BLANK= STRAIGHT
RADIATION HARDENED
SCREENING
BLANK= INDUSTRIAL
K=MIL-PRF-38534 CLASS K; H= MIL-PRF-38534 CLASS H
GENERAL PART NUMBER
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PRELIMINARY Rev. B 9/15
MECHANICAL SPECIFICATIONS
ESD TRIANGLE INDICATES PIN 1
WEIGHT=0.35 GRAMS TYPICAL
ALL DIMENSIONS ARE SPECIFIED IN INCHES
ORDERING INFORMATION
MSK5965 K RH G
LEAD CONFIGURATIONS
G=GULL WING
RADIATION HARDENED
SCREENING
BLANK= INDUSTRIAL
K=MIL-PRF-38534 CLASS K; H= MIL-PRF-38534 CLASS H
GENERAL PART NUMBER
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PRELIMINARY Rev. B 9/15
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.
Contact MSK for MIL-PRF-38534 Class K qualification status.
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PRELIMINARY Rev. B 9/15