MSK5921HRHD [ANAREN]

RAD HARD ULTRA LOW DROPOUT ADJUSTABLE POSITIVE LINEAR REGULATOR;


型号：	MSK5921HRHD
厂家：	ANAREN MICROWAVE
描述：	RAD HARD ULTRA LOW DROPOUT ADJUSTABLE POSITIVE LINEAR REGULATOR 局域网输出元件调节器
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MIL-PRF-38534 AND 38535 CERTIFIED FACILITY

RAD HARD ULTRA LOW

DROPOUT ADJUSTABLE

POSITIVE LINEAR REGULATOR

5921RH

M.S.KENNEDY CORP.

FEATURES:

Total Dose Hardened to 100 Krads(Si) (Method 1019.7 Condition A)

Ultra Low Dropout for Reduced Power Consumption

External Shutdown

Latching Overload Protection

Adjustable Output Using Two External Resistors

Output Current Limit

Available in 4 Lead Form Options: Straight, Up, Down and Gull Wing

Available as SMD 5962R05220

RAD Certified by DLA

DESCRIPTION:

The MSK5921RH is a radiation hardened adjustable linear regulator typically capable of delivering 5.0 amps of output

current. The typical dropout is only 0.30 volts with a 3.0A load. An external shutdown function is ideal for power supply

sequencing. This device also has latching overload protection that requires no external current sense resistor. The MSK5921RH

is radiation hardened and specifically designed for space/satellite applications. The device is packaged in a hermetically

sealed space efficient 5 pin SIP that is electrically isolated from the internal circuitry allowing for direct heat sinking.

EQUIVALENT SCHEMATIC

TYPICAL APPLICATIONS

PIN-OUT INFORMATION

Satellite System Power Supplies

Switching Power Supply Post Regulators

Constant Voltage/Current Regulators

Microprocessor Power Supplies

1 VIN

2 GND

3 VOUT

4 SHUTDOWN

5 ADJUST

CASE=ISOLATED

8548-16 Rev. N 6/14

ABSOLUTE MAXIMUM RATINGS

+VIN

TST

TLD

Supply Voltage

Shutdown Voltage

Output Current

Case Operating Temperature Range

MSK5921K/H RH

MSK5921RH

+10V

10V

Storage Temperature Range¹³-65°C to +150°C

Lead Temperature Range

VSD

IOUT

(10 Seconds)

300°C

See SOA Curve

150°C

Power Dissipation

Junction Temperature

-55°C to +125°C

-40°C to +85°C

ELECTRICAL SPECIFICATIONS

MSK5921K/H

Typ.

MSK5921

Group A

Test Conditions

Parameter

Units

Typ.

Max.

Subgroup Min.

Max. Min.

Input Voltage Range

Feedback Voltage

10mA ≤ IOUT ≤ 1.0A

2,3

2.9

6.5

1.305

1.315

5.0

2.9

6.5

2.9

1.265

1.225

1.202

1.265

1.328

IOUT=1A R1=187Ω

2,3

1.225

Post Radiation

1.215

Feedback Pin Current

Quiescent Current

1,2,3

5.0

μA

VFB=1.265V 10mA ≤ IOUT ≤ 3.0A

VIN=6.5V

±0.01

2,3

Not Including IOUT

Line Regulation

0.01

IOUT=50mA

±0.50

±2.5

±0.80

±2.5

0.40

±0.60 %VOUT

%VOUT

±1.0 %VOUT

2,3

VOUT+0.4V ≤ VIN ≤ IOUT+1.3V

50mA ≤ IOUT ≤ 3.0A

Load Regulation

±0.06

0.06

2,3

%VOUT

Dropout Voltage

0.22

0.26

0.22

0.45

Delta FB=1% IOUT=2.5A

2,3

Minimum Output Current

2.9V ≤ VIN ≤ 6.5V

R1=187Ω

2,3

Output Voltage Range

Output Current Limit

VIN=6.5V

1.5

3.0

1.0

6.0

5.0

1.6

1.5

3.0

6.0

5.0

4.0

1.3

4.0

VIN=3.5V VOUT=2.5V

2,3

Shutdown Threshold

1.3

VOUT ≤ 0.2V (OFF)

VOUT=Nominal (ON)

f=120Hz

1.0

1.6

2,3

Ripple Rejection

IOUT =50mA

5,6

Phase Margin

Gain Margin

degrees

Equivalent Noise Voltage

Thermal Resistance 2

Referred to Feedback Pin

4.0

μVRMS

°C/W

2.2

Junction to Case @ 125°C Output Device

4.0

2.2

NOTES:

Unless otherwise specified, VIN=5.0V, R1=1.62K, VSHUTDOWN=0V and IOUT=10mA. See Figure 2, typical application circuits.

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" 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 T^A=-55°C

Output current limit is dependent upon the values of VIN and VOUT. See Figure 1 and typical performance curves.

Continuous operation at or above absolute maximum ratings may adversely effect the device performance and/or life cycle.

VIN shall be as specified or VIN Min, whichever is greater.

Not applicable when VOUT<VIN Min - dropout voltage maximum.

Pre and post irradiation limits, up to 100Krad TID, are identical unless otherwise specified.

Reference DLA SMD 5962R05220 for electrical specifications for devices purchased as such.

Internal solder reflow temperature is 180°C, do not exceed.

8548-16 Rev. N 6/14

APPLICATION NOTES

PIN FUNCTIONS

OUTPUT CAPACITOR SELECTION

Low ESR output capacitors are required to maintain regu-

lation and stability. Four CWR29FB227 (AVX PN

TAZH227K010L) tantalum capacitors in parallel with ce-

ramic decoupling capacitors (0.1μF typical) provides suf-

ficient gain and phase margin for most applications. The

maximum ESR specification for the CWR29FB227 capaci-

tor is 180mΩ at 100kHz and is sufficient for many appli-

cations. MSK has found through full WCCA that screen-

ing for a maximum ESR of 57mΩ ensures EOL stability

criteria to be met for many applications with the most

stringent requirements. The typical ESR of the

TAZH227K010L from AVX is 49mΩ . Analysis of the final

design is recommended to ensure stability requirements

are met.

VIN - This pin provides power to all internal circuitry

including bias, start-up, thermal limit and overcurrent

latch. Input voltage range is 2.9V to 6.5V.

GND - Internally connected to ground, this pin should be

connected externally by the user to the circuit ground.

SHUTDOWN - There are two functions to the SHUT-

DOWN pin. It may be used to disable the output voltage

or to reset a current latch condition. To activate the shut-

down/reset functions the user must apply a voltage

greater than 1.6V to the SHUTDOWN pin. The voltage ap-

plied to the SHUTDOWN pin can be greater than the input

voltage. The output voltage will turn on when the SHUT-

DOWN pin is pulled below the threshold voltage. If the SHUT-

DOWN pin is not used, it should be connected to ground. It

should be noted that with the shutdown pin tied to ground,

a current latch condition can only be reset by cycling power

off, then on.

VOUT - This is the output pin for the device.

ADJUST - The ADJUST pin is the inverting input of the

internal error amplifier. The non-inverting input is con-

nected to an internal 1.265V reference. This error ampli-

fier controls the drive to the output transistor to force

the ADJUST pin to 1.265V. An external resistor divider

is connected to the output, ADJUST pin and ground to

set the output voltage.

OVERCURRENT LATCH

Overcurrent protection is provided by the MSK5921RH

series through the use of a timed latch off circuit. The

internal latch timeout is triggered by an overcurrent con-

dition. To allow for start up surge currents, the timeout

is approximately 5.5mS at 25°C. If the overcurrent con-

dition remains at the end of the timeout cycle, the regu-

lator will latch off until the latch is reset. Reset the latch

by pulling the shutdown pin high or cycling VIN off then

back on. A thermal limit condition will trigger the latch

with no time out delay.

FIGURE 1

CURRENT LIMIT AND SOA

The MSK5921RH current limit function is directly affected

by the input and output voltages. Figure 1 illustrates the rela-

tionship between VIN and ICL for various output voltages. It

is very important for the user to consult the SOA curve when

using input voltages which result in current limit conditions

beyond 4.5 Amps. When using input voltages which result in

current limit above 4.5 Amps, the user must maintain output

current within the SOA curve to avoid damage to the device.

Note that 5 Amp maximum is due to current carrying capa-

bility of the internal wirebonds.

INPUT POWER SUPPLY BYPASSING

To maximize transient response and minimize power

supply transients it is recommended that a 100μF tanta-

lum capacitor is connected between VIN and ground. A

0.1μF ceramic capacitor should also be used for high

frequency bypassing.

8548-16 Rev. N 6/14

TYPICAL APPLICATIONS CIRCUIT

APPLICATION NOTES CONT.

THERMAL LIMITING

The MSK5921RH control circuitry has a thermal shutdown

temperature of approximately 150°C. This thermal shut-

down can be used as a protection feature, but for continu-

ous operation, the junction temperature of the pass tran-

sistor must be maintained below 150°C. Proper heat sink

selection is essential to maintain these conditions. Exceed-

ing the thermal limit activates the latch feature of the

MSK5921RH. Toggle the shutdown pin high then low or

cycle power to reset the latch. See SHUTDOWN pin de-

scription and overcurrent latch description for more infor-

mation.

HEAT SINK SELECTION

To select a heat sink for the MSK5921RH, the following

formula for convective heat flow may be used.

OUTPUT VOLTAGE SELECTION

Governing Equation:

TJ = PD X (RθJC + RθCS + RθSA) + TA

As noted in the above typical applications circuit, the

formula for output voltage selection is

Where

= Junction Temperature

= Total Power Dissipation

VOUT=1.265

RθJC = Junction to Case Thermal Resistance

RθCS = Case to Heat Sink Thermal Resistance

RθSA = Heat Sink to Ambient Thermal Resistance

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.

= Ambient Temperature

VOUT

R1=R2

-1

1.265

Power Dissipation=(VIN-VOUT) x IOUT

Next, the user must select a maximum junction tem-

perature. The absolute maximum allowable junction tem-

perature is 150°C. The equation may now be rearranged

to solve for the required heat sink to ambient thermal

resistance (RθSA).

START UP CURRENT

The MSK5921RH sinks increased current during startup

to bring up the output voltage. Reference the "Saturated

Drive Current vs. Input Voltage" graph in the typical per-

formance curves of this data sheet and the "Understand-

ing Startup Surge Current With MS Kennedy's RH1573

Based Rad Hard LDO Regulators" application note in the

application notes section of the MS Kennedy Web site

for more information.

Example:

An MSK5921RH is connected for VIN=+3.3V and

VOUT=+2.5V. IOUT is a continuous 3A DC level. The am-

bient temperature is +25°C. The maximum desired junc-

tion temperature is +125°C.

http://www.mskennedy.com/

RθJC=4.0°C/W and RθCS=0.15°C/W for most thermal

TOTAL DOSE RADIATION TEST

PERFORMANCE

greases

Power Dissipation=(3.3V-2.5V) x (3A)

=2.4Watts

Radiation performance curves for TID testing have been

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 MSK5921RH radiation test report. The complete radia-

tion test report is available in the RAD HARD PRODUCTS

section on the MSK website.

Solve for RθSA:

125°C - 25°C

RθSA=

-4.0°C/W - 0.15°C/W

2.4W

= 36.5°C/W

In this example, a heat sink with a thermal resistance

of no more than 36.5°C/W must be used to maintain a

junction temperature of no more than 125°C.

http://www.mskennedy.com/store.asp?pid=9951&catid=19680

8548-16 Rev. N 6/14

TYPICAL PERFORMANCE CURVES

8548-16 Rev. N 6/14

TYPICAL PERFORMANCE CURVES

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.

8548-16 Rev. N 6/14

MECHANICAL SPECIFICATIONS

ESD TRIANGLE INDICATES PIN 1

WEIGHT=7.7 GRAMS TYPICAL

ALL DIMENSIONS ARE SPECIFIED IN INCHES

ORDERING INFORMATION

MSK5921 K RH GW

LEAD CONFIGURATIONS

GW= GULL WING

RADIATION HARDENED

SCREENING

BLANK= INDUSTRIAL; H=MIL-PRF-38534 CLASS H;

K=MIL-PRF-38534 CLASS K

GENERAL PART NUMBER

The above example is an adjustable Class K regulator with gull wing leads.

NOTE: See DLA SMD 5962R05220 for DLA part number options.

8548-16 Rev. N 6/14

MECHANICAL SPECIFICATIONS

ESD TRIANGLE INDICATES PIN 1

WEIGHT=7.7 GRAMS TYPICAL

ALL DIMENSIONS ARE SPECIFIED IN INCHES

ORDERING INFORMATION

MSK5921 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 an adjustable Class K regulator with leads bent up.

NOTE: See DLA SMD 5962R05220 for DLA part number options.

8548-16 Rev. N 6/14

REVISION HISTORY

M.S. Kennedy Corp.

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.

8548-16 Rev. N 6/14

MSK5921HRHD [ANAREN]

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