MIL-PRF-38534 CERTIFIED M.S.KENNEDY CORP. RAD HARD ULTRA LOW DROPOUT ADJUSTABLE POSITIVE LINEAR REGULATOR 5821RH 4707 Dey Road Liverpool, N.Y. 13088 (315) 701-6751 FEATURES: Manufactured using Space Qualified RH1573 Die New "Harder" Version of MSK 5921RH Total Dose Tested to 450K 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 to DSCC SMD 5962F09216 ELDRS Tested to 100 Krads(Si) (Method 1019.7 Condition D) Neutron Tested to 1.0x10 n/cm (Method 1017.2) DESCRIPTION: The MSK 5821RH is a radiation hardened adjustable linear regulator typically capable of delivering 5.0 amps of output current. The typical dropout is only 0.22 volts with a 2.5A 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 5821RH 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 TYPICAL APPLICATIONS PIN-OUT INFORMATION Satellite System Power Supplies Switching Power Supply Post Regulators Constant Voltage/Current Regulators Microprocessor Power Supplies 1 2 3 4 5 1 VIN GND VOUT SHUTDOWN ADJUST Rev. G 1/11 ABSOLUTE MAXIMUM RATINGS +VIN IOUT TC 8 Supply Voltage +10V Output Current 7 5A Case Operating Temperature Range MSK5821K/H RH -55C to +125C MSK5821RH -40C to +85C TST TLD PD TC Storage Temperature Range -65C to +150C 300C Lead Temperature Range (10 Seconds) See SOA Curve Power Dissipation 150C Junction Temperature ELECTRICAL SPECIFICATIONS Input Voltage Range 2 Feedback Voltage Quiescent Current Line Regulation 9 Load Regulation 9 Dropout Voltage 10 Output Voltage Range 2 7 Shutdown Threshold Ripple Rejection 2 MSK5821 Units Subgroup Min. Typ. Max. Min. Typ. Max. 1 2.9 - 6.5 2.9 - 6.5 V 2,3 2.9 - 6.5 - - - V 1 1.225 1.265 1.265 1.328 V - - V 1.328 V 1.305 1.202 2,3 1.225 - Post 100KRAD(Si) 1 1.225 - 1.305 1.202 - Post 300KRAD(Si) 1 1.225 - 1.310 1.202 - 1.328 V VFB=1.265V 10mA IOUT 3.0A 1,2,3 0 - 5.0 0 - 5.0 A VIN=6.5V 1 - 14 20 - 14 20 mA Not Including IOUT 2,3 - 14 - - - mA IOUT=50mA 1 - - 0.01 VOUT+0.4V VIN VOUT +1.3V 2,3 - 2.5 - - 50mA IOUT 3.0A 1 - 0.06 0.80 - 0.06 2,3 - - 2.5 - - - %VOUT 1 - 0.22 0.40 - 0.22 0.45 V 2,3 - 0.26 0.40 - - - V 1 - 8 10 - 8 10 mA R1=187 2,3 - 9 10 - - - mA VIN=6.5V - 1.5 - 6.0 1.5 - 6.0 V VIN=3.5V VOUT=2.5V 1 3.0 4.0 5.0 3.0 4.0 5.0 A 2,3 3.0 4.0 5.0 - - - A VOUT 0.2V (OFF) 1 1.0 1.3 1.6 1.0 1.3 1.6 V VOUT=Nominal (ON) 2,3 1.0 1.3 1.6 - - - V f=120Hz 4 65 - - 65 - - dB IOUT =50mA - - - - dB Delta FB=1% IOUT=2.5A Minimum Output Current 2 Output Current Limit 10mA IOUT 1.0A IOUT=1A R1=187 Feedback Pin Current 2 MSK5821K/H Group A Test Conditions 1 11 Parameter 2.9V VIN 6.5V 1.305 20 0.01 0.50 - - 0.60 %VOUT - %VOUT 1.0 %VOUT 5,6 65 - Phase Margin 2 4 30 - - 30 - - degrees Gain Margin 2 4 10 18 - 10 18 - dB Referred to Feedback Pin 4 - - 50 - - 50 VRMS Junction to Case @ 125C Output Device - - 2.5 2.9 - 2.5 2.9 C/W Equivalent Noise Voltage 2 Thermal Resistance 2 NOTES: 1 2 3 4 5 6 7 8 9 10 11 12 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=+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 VOUT<VIN Min - dropout voltage maximum. Pre and post irradiation limits, up to 300Krad TID, are identical unless otherwise specified. Reference DSCC SMD 5962F09216 for electrical specification for devices purchased as such. 2 Rev. G 1/11 APPLICATION NOTES PIN FUNCTIONS OUTPUT CAPACITOR SELECTION 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. Low ESR output capacitors are required to maintain regulation and stability. Four CWR29FB227 (AVX PN TAZH227K010L) tantalum capacitors in parallel with ceramic decoupling capacitors (0.1F typical) provides sufficient gain and phase margin for most applications. The maximum ESR specification for the CWR29FB227 capacitor is 180m at 100kHz and is sufficient for many applications. MSK has found through full WCCA that screening for a maximum ESR of 57m ensures EOL stability criteria to be met for many applications with the most stringent requirements. The typical ESR of the TAZH227K010L from AVX is 49m . Analysis of the final design is recommended to ensure stability requirements are met. 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. OVERCURRENT LATCH Overcurrent protection is provided by the MSK5821RH 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. 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 5821RH 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 two 47F tantalum capacitors are connected between VIN and ground. A 0.1F ceramic capacitor should also be used for high frequency bypassing. See typical application circuit. 3 Rev. G 1/11 TYPICAL APPLICATIONS CIRCUIT APPLICATION NOTES CONT. THERMAL LIMITING The MSK 5821RH 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. Exceeding the thermal limit activates the latch feature of the MSK 5821RH. Toggle the shutdown pin high then low or cycle power to reset the latch. See SHUTDOWN pin description and overcurrent latch description for more information. HEAT SINK SELECTION To select a heat sink for the MSK 5821RH, the following formula for convective heat flow may be used. FIGURE 2 OUTPUT VOLTAGE SELECTION Governing Equation: TJ = PD X (RJC + RCS + RSA) + TA Where TJ PD RJC RCS RSA TA = = = = = = As noted in the above typical applications circuit, the formula for output voltage selection is VOUT=1.265 1+ R1 R2 Junction Temperature Total Power Dissipation Junction to Case Thermal Resistance Case to Heat Sink Thermal Resistance Heat Sink to Ambient Thermal Resistance Ambient Temperature 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 Table 1 below lists some of the most probable resistor combinations based on industry standard usage. 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). START UP CURRENT The MSK 5821RH sinks increased current during startup to bring up the output voltage. Reference the "Saturated Drive Current vs. Input Voltage" graph in the typical performance curves of this data sheet and the "Understanding 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. http://www.mskennedy.com/ Example: An MSK 5821RH 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= TOTAL DOSE RADIATION TEST PERFORMANCE 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 5810RH radiation test report. The complete radiation test report is available in the RAD HARD PRODUCTS section on the MSK website. 125C - 25C - 2.9C/W - 0.15C/W 2.4W = 38.6C/W In this example, a heat sink with a thermal resistance of no more than 38.6C/W must be used to maintain a junction temperature of no more than 125C. http://www.mskennedy.com/store.asp?pid=9951&catid=19680 Reference the MSK 5826RH RAD REPORT for ELDRS and Neutron results. 4 Rev. G 1/11 TYPICAL PERFORMANCE CURVES 5 Rev. G 1/11 TYPICAL PERFORMANCE CURVES GAIN AND PHASE RESPONSE The gain and phase response curves are for the MSK typical application circuit at 25C 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. 6 Rev. G 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 MSK5821 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 5962F09216 for DSCC part number options. 7 Rev. G 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 MSK5821 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 5962F09216 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. 8 Rev. G 1/11