MSK5985KRHD [ANAREN]
RAD HARD POSITIVE, 1.9A, LDO, SINGLE RESISTOR ADJ VOLTAGE REGULATOR;
| 型号： | MSK5985KRHD |
| 厂家： | 
ANAREN MICROWAVE |
| 描述： | RAD HARD POSITIVE, 1.9A, LDO, SINGLE RESISTOR ADJ VOLTAGE REGULATOR |
| 文件： | 总9页 (文件大小：560K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MIL-PRF-38534 AND 38535 CERTIFIED FACILITY
RAD HARD POSITIVE,
1.9A, LDO, SINGLE RESISTOR
5985RH
ADJ VOLTAGE REGULATOR
FEATURES:
• Manufactured using
Space Qualified RH3083 Die
• MIL-PRF-38534 Class K Processing & Screening
• Total Dose Hardened to 300 Krads(Si) (Method 1019.7 Condition A)
• Low Dropout to 310mV (VIN - VOUT, with Seperate Control Supply)
• Output Adjustable to Zero Volts
• Internal Short Circuit Current Limit
• Output Voltage is Adjustable with 1 External Resistor
• Output Current Capability to 1.9A
• Internal Thermal Overload Protection
• Outputs may be Paralleled for Higher Current
• Contact MSK for MIL-PRF-38534 Qualification and Radiation Status
DESCRIPTION:
The MSK5985RH offers low dropout down to 310mV and an output voltage range down to zero volts while offering
radiation tolerance for space applications. This, combined with the low qJC, allows increased output current while providing
exceptional device efficiency. Output voltage is selected by the user through the use of 1 external resistor. Additionally, the
regulator offers internal short circuit current and thermal limiting, which allows circuit protection and eliminates the need for
external components and excessive derating. The MSK5985RH is hermetically sealed in a space efficient 5 pin SIP, that is
electrically isolated from the internal circuitry allowing for direct heat sinking.
EQUIVALENT SCHEMATIC
PIN-OUT INFORMATION
TYPICAL APPLICATIONS
• High Efficiency Linear Regulators
• Constant Voltage/Current Regulators
• Space System Power Supplies
• Switching Power Supply Post Regulators
• Very low Voltage Power Supplies
1
2
3
4
5
VIN
CONTROL
VOUT
SENSE
SET
CASE = ISOLATED
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8548-143 Rev. E 12/17
10
ABSOLUTE MAXIMUM RATINGS
7
VIN
Input Voltage............................................ +18V, -0.3V
PD Power Dissipation................................... Internally Limited
TJ Junction Temperature............................................ +150°C
TST Storage Temperature Range................... -65°C to +150°C
TLD Lead Temperature Range
(10 Seconds)........................................................... 300°C
TC Case Operating Temperature
7
No Overload or Short............................... +23V, -0.3V
VCONTROL Control Pin Voltage............................................. ±28V
7
IOUT
ISET
VSET
Output Current..................................................... 3.0A
Set Pin Current ............................................... ±25mA
Set Pin Voltage................................................... ±10V
8
7
MSK5985RH.......................................... -40°C to +85°C
MSK5985K/H RH................................. -55°C to +125°C
ESD Rating............................................................ Class 2
ELECTRICAL SPECIFICATIONS
MSK 5985K/H RH
MSK 5985RH
Group A
Subgroup
Parameter
Test Conditions
1
11
Units
Min.
Typ.
Max.
Min.
Typ.
Max.
1
2, 3
1
49.5
49
50
-
50.5
51.5
51
49.5
-
50
50.5
µA
µA
VCONTROL=VIN=3.0V VOUT=1.0V 5mA ≤ ILOAD ≤ 1.9A
Post Radiation
Set Pin Current
(ISET)
-
-
-
51
4.5
-
49
-
49
-4.5
-
µA
1
-4.5
-6
0
4.5
6
0
mV
mV
mV
nA
Output Offset Voltage
(VOS)
VCONTROL=VIN=3.0V VOUT=1.0V
ILOAD=5mA
2, 3
1, 2, 3
1, 2, 3
1, 2, 3
-
-
VCONTROL=VIN=3.0V VOUT=0V 5mA ≤ ILOAD ≤ 1.9A
(
Δ VOS)
(Δ ISET)
(Δ VOS) SENSE PIN=NC
-4
1
4
-4
-
4
Load Regulation
Line Regulation
-300
-
-60
8
+300
-
-300
-
-60
8
+300
-
mV
ΔVIN=2V TO 24V ΔVCONTROL=3V TO 24V
(
Δ VOS)
1, 2, 3
1, 2, 3
-0.05
-10
-
0.05
+10
-0.05
-10
-
0.05
+10
mV/V
nA/V
VOUT=0V
ILOAD=5mA
(Δ ISET)
1
1
1
2, 3
1
-
265
-
700
800
1.55
1.65
11
-
265
-
700
mV
mV
V
VIN Dropout Voltage
Control Pin Dropout Voltage
Control Pin Current
VOUT=1.0V ILOAD=1.9A VCONTROL=3.0V
VOUT=1.0V ILOAD=1.9A VIN=3.0V
-
-
-
-
1.25
-
-
1.25
-
1.55
2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
-
-
-
-
11
100
-
V
ILOAD = 100mA
ILOAD = 1.9A
-
5.5
50
2.3
2.9
-
-
5.5
50
2.3
2.9
-
mA
mA
A
VIN=2.0V VOUT=1.0V
VCONTROL=3.0V
-
100
-
-
1.9
1.9
Current Limit
9
VCONTROL=VIN=5.0V VOUT=1.0V
SENSE PIN=NC
-
-
-
-
-
-
-
-
A
Minimum Load Current
Ripple Rejection
6
VCONTROL=VIN=23V
1
1
mA
dB
2
F=120Hz ΔVIN=0.5VPP IOUT=0.1A
CSET = 0.1µF
CSET = 0.1µF
-
85
-
85
-
VIN=VCONTROL=3V, IOUT=500mA
Output Noise
2
-
-
-
-
40
-
-
-
40
-
µVRMS
10Hz to 100KHz
Thermal Resistance
2
Junction to Case @ 125°C
2.7
3.2
2.7
3.2
°C/W
NOTES:
1
Output is decoupled to ground using a 220µF tantalum low ESR capacitor in parallel with 3 pieces of 1.0µF and one 0.1µF ceramic capacitor unless otherwise
specified. Sense pin connected to VOUT unless otherwise specified. (See Figure 1).
2
3
4
5
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.
Class H and K devices shall be 100% tested to subgroups 1, 2 and 3.
Subgroup
Subgroup
Subgroup
1
2
3
TA = TC = +25°C
TA = TC = +125°C
TA = TC = -55°C
6
7
Minimum load current verified while testing line regulation.
Voltage is measured with respect to VOUT.
8
Set pin is clamped to VOUT with diodes in series with 1KΩ resistors. Current will flow under transient conditions.
Reference the current limit typical performance curve for output current capability versus voltage drop.
Continuous operation at or above absolute maximum ratings may adversely effect 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.
9
10
11
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8548-143 Rev. E 12/17
APPLICATION NOTES
LOW DROPOUT OPERATION
OUTPUT VOLTAGE
Using separate VIN and CONTROLpower supplies allows for lower
dropout and improved efficiency. Figure 2 shows the MSK5985RH
output transistor collector is connected to the VIN pin. The regulator
control circuitry is powered by the CONTROL input. The dropout of
the regulator is determined by the saturation voltage of the output
transistor, typical 300mV at 1.9AILOAD. The CONTROLsupply must
supply the base drive current for the output transistor. The CONTROL
current minus the 50µA SET current is supplied to the load. See the
Typical Performance Characteristics curves for expected VIN dropout
voltage, CONTROL pin dropout voltage and current requirements
under various conditions. With separate supplies for VIN and
CONTROL, power dissipation is reduced and efficiency improves.
A single resistor (RSET) from the SET pin to ground creates the
reference voltage for the internal Error Amplifier. The MSK5985RH
SET pin supplies a constant current of 50uA that develops the
reference voltage. The output voltage is simply RSET x 50uA. Since
the output is internally driven by a unity-gain amplifier, an alternative
to using RSET is to connect a high quality reference source to the
SET pin. With a minimum load requirement of 1mAon the Output, the
Output Voltage can be adjusted to near 0V. To bring the output voltage
to 0V, the load must be connected to a slightly negative voltage supply
to sink the 1mA minimum load current from a 0V output.
FIGURE 1
FIGURE 2
INPUT CAPACITANCE
Pins 3-8 are the connection to the collector of the power device
of the MSK5985RH. Output load current is supplied through these
pins. Minimum input capacitance for these devices is 10uF. Low ESR,
ceramic input capacitors are acceptable for applications without long
input leads. For applications with long input leads, the self inductance
of the wires can cause instability. Care must be taken to minimize the
inductance of the input wires. This can be accomplished through the
use of series resistance or higher ESR input capacitors. A minimum
of 10uF of low ESR tantalum bulk capacitance in parallel with low
value ceramic decoupling capacitance is recommended.
ADDITIONAL STABILITY
A capacitor placed in parallel with the SET pin resistor to ground,
will improve the output transient response and filter noise in the
system. To reduce output noise, typically 500-1000pF is required.
Capacitors up to 1µF can be used, however consideration must be
given to the effect the time constant created will have on the startup
time.
CONTROL PIN
The control pin is the bias supply for the control circuitry of the
MSK5985RH. Minimum input capacitance on the control pin is 2.2uF.
Approximately 1.7% of the output current flows into this pin. For
proper regulation, the control pin voltage must be 1.6V greater than
the output voltage. (See Control Dropout Voltage Specification).
OUTPUT CAPACITANCE
For stability purposes, the MSK5985RH requires a minimum output
capacitor of 10µF with an ESR of 0.5Ω or less. Tantalum or ceramic
capacitors are recommended.Alarger capacitance value will improve
transient response for increased load current changes. Consideration
must also be given to temperature characteristics of the capacitors
used.
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8548-143 Rev. E 12/17
APPLICATION NOTES
IMPROVING INITIAL ACCURACY AND REDUCING
TEMPERATURE DRIFT
LOAD REGULATION
The MSK5985RH specified load regulation is Kelvin Sensed,
therefore the parasitic resistance of the system must be considered
to design an acceptable load regulation. The overall load regulation
includes the specified MSK5985RH load regulation plus the parasitic
resistance multiplied by the load current as shown in Figure 3. RSO
is the series resistance of all conductors between the MSK5985RH
output and the load. It will directly increase output load regulation
error by a voltage drop of ∆IO x RSO. RSS is the series resistance
between the SET pin and the load. RSS will have little effect on load
regulation if the SET pin trace is connected as close to the load as
possible keeping the load return current on a separate trace as shown.
RSR is the series resistance of all of the conductors between the load
and the input power source return. RSR will not effect load regulation
if the SET pin is connected with a Kelvin Sense type connection as
shown in Figure 3, but it will increase the effective dropout voltage
by a factor of IO x RSR. Keeping RSO and RSR as low as possible
will ensure minimal voltage drops and wasted power.
The initial output accuracy of the MSK5985RH due to SET pin
current tolerance and set point resistor accuracy can be reduced to
0.2% using the MSK109RH radiation hardened precision reference.
Minimal drift of the MSK109RH from temperature extremes and
irradiation ensure very tight regulation. The circuit can be configured
to use the 2.5V reference to directly set the output at 2.5V or with a
slight variation it can provide any output within the operating range of
the MSK5985RH down to 0V output. Select RSto maintain between
1mAand 10mAof current through the reference; see Figure 5 below.
RS may be tied to VIN or another power source. The optional trim
resistor can be used to further trim out initial output and system
error. Reference the MSK109RH data sheet for application circuits
that provide stable output voltages across the full operating range
of the MSK5985RH including down to 0V output and the operating
characteristics of the MSK109RH.
FIGURE 3
PARALLELING DEVICES
FIGURE 5
When currents greater than 1.9A are needed, the MSK5985RH's
may be paralleled to multiply the current capacity.As shown in Figure
4, the VIN and SET pins must be tied together. The VOUT pins are
connected to the load with consideration to the conductor resistance.
The conductor resistance of each MSK5985RH VOUT connection
to the load, must be equal to create equal load sharing. As little as
10mΩ ballast resistance typically ensures better than 80% equal
sharing of load current at full load. Additional consideration must be
given to the effect the additional VOUT conductor resistance has on
load regulation; see paragraph titled "Load Regulation".
ADDING SHUTDOWN
The MSK5985RH can be easily shutdown by either reducing
RSET to 0Ω or connecting a transistor from the SET pin to ground.
By connecting two transistors, as shown in Figure 6, a low current
voltage source is all that is required to take the SET pin to ground
as well as pull the output voltage to ground. Q2 pulls the output
voltage to ground when no load is present and only needs to sink
10mA.
FIGURE 6
FIGURE 4
4
8548-143 Rev. E 12/17
APPLICATION NOTES CONT'D
TOTAL DOSE RADIATION TEST
PERFORMANCE
HEAT SINKING
To determine if a heat sink is required for your application and if so,
what type, refer to the thermal model and governing equation below.
Radiation performance curves for TID testing will be generated
for all radiation testing performed by MS Kennedy. These curves
show performance trends throughout the TID test process and can
be located in the MSK5985RH radiation test report. The complete
radiation test report will be available in the RAD HARD PRODUCTS
section on the MSK website.
Governing Equation: 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
TC = Case Temperature
ADDITIONAL APPLICATION INFORMATION
For additional applications information, please reference Linear
Technology Corporation's® LT3083 and RH3083 data sheets.
TA = Ambient Temperature
TS = Heat Sink Temperature
EXAMPLE:
This example demonstrates the thermal calculations for the regulator
operating at 1.5A output current.
Conditions for MSK5985RH:
VCONTROL=VIN = +3.0V; IOUT = +1.5A VOUT=+1.0V
1.) Assume 45° heat spreading model.
2.) Find regulator power dissipation:
PD = (VIN - VOUT)(IOUT)
PD = (3-1)(1.50)
= 3.0W
3.) For conservative design, set TJ = +125°C Max.
4.) For this example, worst case TA = +90°C.
5.) RθJC = 3.2°C/W from the Electrical Specification Table.
6.) RθCS= 0.15°C/W for most thermal greases.
7.) Rearrange governing equation to solve for RθSA:
RθSA = (TJ - TA)/PD - (RθJC) - (RθCS)
= (125°C - 90°C)/3.0W - 3.2°C/W - 0.15°C/W
= 8.3°C/W
In this case the result is 8.3°C/W. Therefore, a heat sink with a
thermal resistance of no more than 8.3°C/W must be used in this
application to maintain regulator circuit junction temperature under
125°C.
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8548-143 Rev. E 12/17
TYPICAL PERFORMANCE CURVES
6
8548-143 Rev. E 12/17
TYPICAL PERFORMANCE CURVES CONT'D
7
8548-143 Rev. E 12/17
MECHANICAL SPECIFICATIONS
ESD TRIANGLE INDICATES PIN 1
WEIGHT=0.36 GRAMS TYPICAL
ALL DIMENSIONS ARE SPECIFIED IN INCHES
ORDERING INFORMATION
MSK5985 K RH U
LEAD CONFIGURATIONS
S = STRAIGHT; U = BENT UP; D = BENT DOWN
RADIATION HARDENED
SCREENING
BLANK = INDUSTRIAL
H = MIL-PRF-38534 CLASS H; K = MIL-PRF-38534 CLASS K
GENERAL PART NUMBER
The above example is a Class K regulator with leads bent up.
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8548-143 Rev. E 12/17
REVISION HISTORY
REV
-
STATUS
Preliminary
Preliminary
Preliminary
Preliminary
Released
DATE
01/14
01/14
03/14
08/14
10/14
12/17
DESCRIPTION
Initial Release
A
Add clarifications for block diagram, electrical specificastions, max ratings and applications section.
Add clarifications, electrical specifications.
Update electrical specifications.
B
C
D
Update current limit specifications.
E
Released
Add ESD Rating.
ANAREN, MSK Products
www.anaren.com/msk
The information contained herein is believed to be accurate at the time of printing. Anaren, MSK products 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 Anaren, MSK Products for MIL-PRF-38534 Class H, Class K qualification and radiation status.
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8548-143 Rev. E 12/17
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