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MIL-PRF-38534 CERTIFIED
M.S.KENNEDY CORP.
RAD TOLERANT ULTRA LOW DROPOUT ADJUSTABLE POSITIVE LINEAR REGULATOR
5921RH
(315) 701-6751
4707 Dey Road Liverpool, N.Y. 13088
FEATURES:
Total Dose Tested to 300K RAD Ultra Low Dropout for Reduced Power Consumption External Shutdown Latching Overload Protection Adjustable Output Using Two External Resistors Output Current Limit Available in 3 Lead Form Options: Straight, Up and Down Available to DSCC SMD # 5962-05220
DESCRIPTION:
The MSK 5921RH is a rad tolerant 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 tolerant 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 TYPICAL APPLICATIONS
Satellite System Power Supplies Switching Power Supply Post Regulators Constant Voltage/Current Regulators Microprocessor Power Supplies
PIN-OUT INFORMATION
1 2 3 4 5 VIN GND VOUT SHUTDOWN ADJUST
1
Rev. C
1/06
ABSOLUTE MAXIMUM RATINGS
+VIN IOUT TC
8
ELECTRICAL SPECIFICATIONS
Parameter Input Voltage Range 2 Test Conditions 1 11 10mA IOUT 1.0A Group A Subgroup 1 2,3 Feedback Voltage IOUT=3.0A R1=187 1 2,3 Feedback Pin Current 2 Quiescent Current VFB=1.265V 10mA IOUT 3.0A VIN=6.5V Not Including IOUT Line Regulation 9 IOUT=50mA VOUT+0.4V VIN IOUT+1.3V Load Regulation 9 10mA IOUT 3.0A 1,2,3 1 2,3 1 2,3 1 2,3 Dropout Voltage 10 Delta FB=1% IOUT=2.5A 1 2,3 Minimum Output Current 2 2.8V VIN 6.5V R1=187 Output Voltage Range 2 Output Current Limit
7
MSK5921K/H/E Min. 2.9 2.9 1.225 1.225 0 1.5 3.0 3.0 1.0 1.0 65 65 30 10 Typ. 1.265 14 14 Max. 6.5 6.5 Min. 2.9 -
MSK5921 Typ. 1.265 14 0.01 0.06 0.22 8 4.0 1.3 70 18 2.2 Max. 6.5 1.328 5.0 20 -
1.305 1.202 1.305 5.0 20 20 0 1.5 3.0 1.0 65 30 10 -
0.01 0.50 0.50
0.60 %VOUT %VOUT
0.06 0.80 0.22 0.26 8 9 4.0 4.0 1.3 1.3 70 18 2.2 0.80 0.40 0.40 10 10 6.0 5.0 5.0 1.6 1.6 50 4.0
1.0 %VOUT 0.45 10 6.0 5.0 1.6 50 4.0 %VOUT V V mA mA V A A V V dB dB degrees dB VRMS C/W
1 2,3 1 2,3
VIN=6.5V VIN=3.5V VOUT=2.5V
Shutdown Threshold
VOUT 0.2V (OFF) VOUT=Nominal (ON)
1 2,3 4 5,6 4,5,6 4,5,6
Ripple Rejection 2
f=120Hz IOUT =50mA
Phase Margin 2 Gain Margin 2 Equivalent Noise Voltage 2 Thermal Resistance 2 Referred to Feedback Pin Junction to Case @ 125C Output Device
4,5,6 -
NOTES:
1 2 3 4 5 6 Unless otherwise specified, VIN=5.0V, R1=1.62K, VSHUTDOWN=0V and IOUT=10mA. See Figure 2. Guaranteed by design but not tested. Typical parameters are representative of actual device performance but are for reference only. Industrial grade and "E" suffix 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=+25C Subgroup 2,5 TC=+125C Subgroup 3,6 TA=-55C 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 VOUT7 8 9 10 11
2
Rev. C

PD TC

Supply Voltage +10V Output Current 7 5A Case Operating Temperature Range MSK5921K/H/E RH -55C to +125C MSK5921RH -40C to +85C

TST TLD
Storage Temperature Range -65C to +150C Lead Temperature Range 300C (10 Seconds) Power Dissipation See SOA Curve Junction Temperature 150C
Units V V V V A mA mA
1/06
APPLICATION NOTES PIN FUNCTIONS
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 SHUTDOWN pin. It may be used to disable the output voltage or to reset a current latch condition. To activate the shutdown/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 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 connected to an internal 1.265V reference. This error amplifier 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.
OUTPUT CAPACITOR SELECTION
Output capacitors are required to maintain regulation and stability. A 220F surface mount tantalum capacitor in parallel with a 1.0F ceramic capacitor from the output to ground should suffice under most conditions. If the user finds that tighter voltage regulation is needed during output transients, more capacitance may be added. If more capacitance is added to the output, the bandwidth may suffer. ESR of the output capacitors should be maintained at 0.1 to 1.
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 condition. To allow for start up surge currents, the timeout is approximately 5.5mS at 25C. If the overcurrent condition remains at the end of the timeout cycle, the regulator will latch off until the latch is reset. The latch condition can be reset 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 affected by the input and output voltages. Figure 1 illustrates the relationship 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 capability of the internal wirebonds.
INPUT POWER SUPPLY BYPASSING
To maximize transient response and minimize power supply transients it is recommended that a 100F tantalum capacitor is connected between VIN and ground. A 0.1F ceramic capacitor should also be used for high frequency bypassing.
3
Rev. C
1/06
APPLICATION NOTES CONT. THERMAL LIMITING
The MSK 5921RH control circuitry has a thermal shutdown temperature of approximately 150C. 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 150C. Proper heat sink selection is essential to maintain these conditions.
TYPICAL APPLICATIONS CIRCUIT
HEAT SINK SELECTION
To select a heat sink for the MSK 5921RH, the following formula for convective heat flow may be used.
Governing Equation:
TJ = PD X (RJC + RCS + RSA) + TA Where TJ PD RJC RCS RSA TA
= = = = = =
Junction Temperature Total Power Dissipation Junction to Case Thermal Resistance Case to Heat Sink Thermal Resistance Heat Sink to Ambient Thermal Resistance Ambient Temperature
OUTPUT VOLTAGE SELECTION
As noted in the above typical applications circuit, the formula for output voltage selection is R1 VOUT=1.265 1+ R2 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 VOUT -1 1.265
Power Dissipation=(VIN-VOUT) x IOUT Next, the user must select a maximum junction temperature. The absolute maximum allowable junction temperature is 150C. The equation may now be rearranged to solve for the required heat sink to ambient thermal resistance (RSA).
Example:
An MSK 5921RH is connected for VIN=+3.3V and VOUT=+2.5V. IOUT is a continuous 3A DC level. The ambient temperature is +25C. The maximum desired junction temperature is +125C. RJC=4.0C/W and RCS=0.15C/W for most thermal greases Power Dissipation=(3.3V-2.5V) x (3A) =2.4Watts Solve for RSA: RSA= 125C - 25C -4.0C/W - 0.15C/W 2.4W = 36.5C/W In this example, a heat sink with a thermal resistance of no more than 36.5C/W must be used to maintain a junction temperature of no more than 125C.
Table 1 below lists some of the most probable resistor combinations based on industry standard usage. TABLE 1 OUTPUT VOLTAGE (V) 1.5 1.8 2.0 2.5 2.8 3.3 4.0 5.0 R2 () 1K 1K 1K 1K 1K 1K 1K 1K R1 (nearest 1%) () 187 422 576 976 1.21K 1.62K 2.15K 2.94K
4
Rev. C
1/06
TYPICAL PERFORMANCE CURVES
5
Rev. C
1/06
RADIATION PERFORMANCE CURVES
NOTE: All radiation performance curve test conditions are in accordance with the electrical specifications table (page 2). 6
Rev. C
1/06
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; E=EXTENDED RELIABILITY 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 5962-05220 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. Contact MSK for MIL-PRF-38534 Class H, Class K and Appendix G (radiation) status.
7
Rev. B 11/05

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