MSK5921KRHD [MSK]

Adjustable Positive LDO Regulator, 1.5V Min, 6V Max, 0.4V Dropout, HERMETIC SEALED, SIP-5;


型号：	MSK5921KRHD
厂家：	M.S. KENNEDY CORPORATION
描述：	Adjustable Positive LDO Regulator, 1.5V Min, 6V Max, 0.4V Dropout, HERMETIC SEALED, SIP-5 局域网输出元件调节器
文件：	总8页 (文件大小：184K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

MIL-PRF-38534 CERTIFIED

RAD HARD ULTRA LOW

DROPOUT ADJUSTABLE

5921RH

POSITIVE LINEAR REGULATOR

M.S.KENNEDY CORP.

4707 Dey Road Liverpool, N.Y. 13088

(315) 701-6751

FEATURES:

Total Dose Tested to 300K RAD (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 DSCC

DESCRIPTION:

The MSK 5921RH 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 MSK 5921RH 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

Rev. L 1/11

ABSOLUTE MAXIMUM RATINGS

+VIN

IOUT

Supply Voltage

Output Current

Case Operating Temperature Range

+10V

TST

TLD

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

Lead Temperature Range

(10 Seconds)

300°C

MSK5921K/H RH

MSK5921RH

-55°C to +125°C

-40°C to +85°C

Power Dissipation

Junction Temperature

See SOA Curve

150°C

ELECTRICAL SPECIFICATIONS

MSK5921K/H

Typ.

MSK5921

Group A

Test Conditions

Parameter

Units

Typ.

Max.

Subgroup Min.

Max. Min.

Input Voltage Range

10mA ≤ IOUT ≤ 1.0A

2,3

2.9

6.5

1.305

1.315

5.0

2.9

6.5

2.9

Feedback Voltage

1.265

1.225

1.202

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

Referred to Feedback Pin

4.0

μVRMS

°C/W

Thermal Resistance

2.2

Junction to Case @ 125°C Output Device

4.0

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 DSCC SMD 5962R05220 for electrical specifications for devices purchased as such.

Rev. L 1/11

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 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. It should be

noted that with the shutdown pin tied to ground, a cur-

rent 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 MSK 5921RH current limit function is directly af-

fected by the input and output voltages. Figure 1 illus-

trates the relationship between VIN and ICL for various

output voltages. It is very important for the user to con-

sult 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 capability 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.

Rev. L 1/11

TYPICAL APPLICATIONS CIRCUIT

APPLICATION NOTES CONT.

THERMAL LIMITING

The MSK 5921RH control circuitry has a thermal shut-

down temperature of approximately 150°C. This ther-

mal 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 condi-

tions. Exceeding the thermal limit activates the latch fea-

ture of the MSK 5921RH. Toggle the shutdown pin high

then low or cycle power to reset the latch. See SHUT-

DOWN pin description and overcurrent latch description

for more information.

HEAT SINK SELECTION

To select a heat sink for the MSK 5921RH, the follow-

ing 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

Table 1 below lists some of the most probable resistor

combinations based on industry standard usage.

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).

TABLE 1

R1 (nearest 1%)

(Ω)

OUTPUT VOLTAGE

(V)

187

422

576

976

1.21K

1.62K

2.15K

2.94K

1.5

1.8

2.0

2.5

2.8

3.3

4.0

5.0

Example:

An MSK 5921RH 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.

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

greases

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

TOTAL DOSE RADIATION TEST

PERFORMANCE

=2.4Watts

Solve for RθSA:

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 MSK 5921RH radiation test report. The complete

radiation test report is available in the RAD HARD PROD-

UCTS section on the MSK website.

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

Rev. L 1/11

TYPICAL PERFORMANCE CURVES

Rev. L 1/11

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.

Rev. L 1/11

MECHANICAL SPECIFICATIONS

WEIGHT=7.7 GRAMS TYPICAL

ALL DIMENSIONS ARE ±0.010 INCHES UNLESS OTHERWISE LABELED.

ESD Triangle indicates pin 1.

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 DSCC SMD 5962R05220 for DSCC part number options.

Rev. L 1/11

MECHANICAL SPECIFICATIONS

WEIGHT=7.7 GRAMS TYPICAL

ALL DIMENSIONS ARE ±0.010 INCHES UNLESS OTHERWISE LABELED.

ESD Triangle indicates pin 1.

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 DSCC SMD 5962R05220 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.

Rev. L 1/11

MSK5921KRHD [MSK]

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