MIL-PRF-38534 CERTIFIED FACILITY M.S.KENNEDY CORP. VERY HIGH CURRENT, LOW DROPOUT SURFACE MOUNT VOLTAGE REGULATORS 5250 SERIES 4707 Dey Road Liverpool, N.Y. 13088 (315) 701-6751 FEATURES: Hermetic Surface Mount Package Extremely Low Dropout Voltage: 370mV @ 5 Amps Available in 1.5V, 1.7V, 1.9V, 2.5V, 3.3V, 5.0V and 12.0V On Board Thermal Shut Down Reverse Battery and Load Dump Protection Low Ground Current: 70mA Typical at Full Load 1% Maximum Guaranteed Accuracy Output Current to 5 Amps Alternate Output Voltages Available DESCRIPTION: The MSK 5250 series voltage regulators are available in +1.5V, +1.7V, +1.9V, +2.5V, +3.3V, +5.0V, and +12.0V output configurations. All boast ultra low dropout specifications due to the utilization of a super PNP output pass transistor with monolithic technology. Dropout voltages of 370mV at 5 amps are typical in this configuration, which drives efficiency up and power dissipation down. Accuracy is guaranteed with a 1% maximum output voltage tolerance. The MSK 5250 series is packaged in a space efficient 3 pin power surface mount ceramic package. EQUIVALENT SCHEMATIC TYPICAL APPLICATIONS PIN-OUT INFORMATION 1 VIN 2 VOUT 3 Ground High Efficiency, High Current Linear Regulators Constant Voltage/Current Regulators System Power Supplies Switching Power Supply Post Regulators Battery Powered Equipment LID=ISOLATED 1 8548-44 Rev. G 4/12 10 ABSOLUTE MAXIMUM RATINGS VINP VIN VEN IOUT Input Voltage (100mS 1%D.C.) -20V to +60V Input Voltage 26V Enable Voltage -0.3V to 26V Output Current 5.0A ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ TST TLD Storage Temperature Range Lead Temperature . . . . . . . (10 Seconds Soldering) Operating Temperature MSK 5250 Series . . . . . . . MSK 5250H Series . . . . . . ○ ○ ○ ○ ○ ○ ○ ○ TJ . . -65°C to +150°C . . . . . . . . . . 300°C . . -40°C to +85°C . -55°C to +125°C ELECTRICAL SPECIFICATIONS Parameter Test Conditions 1 3 MSK 5250 SERIES MSK 5250H SERIES Group A Typ. Max. Units Typ. Max. Min. Subgroup Min. 1 - ±0.5 ±1.0 - ±0.5 ±1.0 % 2, 3 - ±1.0 ±2.0 - - - % ΔVOUT = -1%; IOUT = 250 mA 1 - 125 250 - 125 275 mV ΔVOUT = -1%; IOUT = 5A 1 - 370 600 - 370 625 mV VIN = VOUT+1.5V 1 - ±0.2 ±1.0 - ±0.2 ±1.2 % 10 mA ≤ IOUT ≤ 4.5A 2, 3 - ±0.3 ±2.0 - ±0.3 - % (VOUT +1V) ≤ VIN ≤ 26V 1 - ±0.05 ±0.5 - ±0.05 ±0.6 % IOUT = 10 mA 2, 3 - ±0.5 ±1.0 - ±0.5 - % VOUT = 0V; VIN = VOUT +1V - - 7.5 10 - 7.5 10 A VIN = VOUT +1V; IOUT = 2.5A - - 25 60 - 25 65 mA VIN = VOUT +1V; IOUT = 5A - - 80 - - 80 - mA CL = 20μF; 10 HZ ≤ f ≤ 100 KHZ - - 400 - - 400 - μV Thermal Resistance 2 Junction to Case @ 125°C - - 1.7 2.0 - 1.7 2.2 °C/W Thermal Shutdown 2 TJ - - 130 - - 130 - °C Output Voltage Tolerance Dropout Voltage Load Regulation 2 8 Line Regulation Output Current Limit 2 9 Ground Current 2 Output Noise 2 IOUT = 10mA; VIN = VOUT +1V PART NUMBER NOTES: OUTPUT VOLTAGE MSK5250-1.5 7 +1.5V MSK5250-1.7 +1.7V +1.9V MSK5250-1.9 1 Output decoupled to ground using 47μF minimum capacitor unless otherwise specified. 2 This parameter is guaranteed by design but need not be tested. +2.5V MSK5250-2.5 Typical parameters are representative of actual device performance but are for reference only. 3 All output parameters are tested using a low duty cycle pulse to maintain TJ = TC. +3.3V MSK5250-3.3 4 Industrial grade devices shall be tested to subgroup 1 unless otherwise specified. +5.0V MSK5250-5.0 5 Military grade devices ('H' suffix) shall be 100% tested to subgroups 1,2,3. 6 Subgroup 1 TC = +25°C +12.0V MSK5250-12 Subgroup 2 TJ = +125°C Subgroup 3 TA = -55°C 7 Please consult the factory if alternate output voltages are required. 8 Due to current limit, maximum output current may not be available at all values of VIN-VOUT and temperatures. See typical performance curves for clarification. 9 The output current limit function provides protection from transient overloads but it may exceed the maximum continuousrating. Continuous operation in current limit may damage the device. 10 Continuous operation at or above absolute maximum ratings may adversely effect the device performance and/or life cycle. 2 8548-44 Rev. G 4/12 APPLICATION NOTES REGULATOR PROTECTION: PACKAGE CONNECTIONS: The MSK 5250 series is fully protected against reversed input polarity, overcurrent faults, overtemperature conditions (Pd) and transient voltage spikes of up to 60V. If the regulator is used in dual supply systems where the load is returned to a negative supply, the output voltage must be diode clamped to ground. The MSK 5250 series are highly thermally conductive devices and the thermal path from the package heat sink to the internal junctions is very short. Standard surface mount soldering techniques should be used when mounting the device. Some applications may require additional heat sinking of the device. OUTPUT CAPACITOR: HEAT SINK SELECTION: The output voltage ripple of the MSK 5250 series voltage regulators can be minimized by placing a filter capacitor from the output to ground. The optimum value for this capacitor may vary from one application to the next, but a minimum of 20μF is recommended for optimum performance. Transient load response can also be improved by placing a capacitor directly across the load. The capacitor should not be an ultra-low ESR type. Tantalum capacitors are best for fast load transients but aluminum electrolytics will work fine in most applications. To select a heat sink for the MSK 5250, the following formula for convective heat flow may be used. 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 Ta = Ambient Temperature First, the power dissipation must be calculated as follows: LOAD CONNECTIONS: In voltage regulator applications where very large load currents are present, the load connection is very important. The path connecting the output of the regulator to the load must be extremely low impedance to avoid affecting the load regulation specifications. Any impedance in this path will form a voltage divider with the load. Power Dissipation = (Vin - Vout) x Iout Next, the user must select a maximum junction temperature. The absolute maximum allowable junction temperature is 125°C. The equation may now be rearranged to solve for the required heat sink to ambient thermal resistance (Rθsa). MINIMIZING POWER DISSIPATION: Many applications can not take full advantage of the extremely low dropout specifications of the regulator due to large input to output voltage differences. The simple circuit below illustrates a method to reduce the input voltage at the regulator to just over the dropout specification to keep the internal power dissipation minimized: EXAMPLE: An MSK 5250-3.3 is configured for Vin=+5V and Vout=+3.3V. Iout is a continuous 1A DC level. The ambient temperature is +25°C. The maximum desired junction temperature is 125°C. Rθjc = 1.7°C/W and Rθcs = 0.5°C/W typically. Power Dissipation = (5V - 3.3V) x (1A) = 1.7 Watts Solve for Rθsa: Rθsa = 125°C - 25°C - 1.7°C/W - 0.5°C/W 1.7W [ ] = 56.62°C/W In this example, a heat sink with a thermal resistance of no more than 56°C/W must be used to maintain a junction temperature of no more than 125°C. For a given continuous maximum load of 1 amp, R1 can be selected to drop the voltage seen at the regulator to 4V. This allows for the output tolerance and dropout specifications. Input voltage variations (5V) also should be included in the calculations. The resistor should be sized according to the power levels required for the application. 3 8548-44 Rev. G 4/12 TYPICAL PERFORMANCE CURVES 4 8548-44 Rev. G 4/12 MECHANICAL SPECIFICATIONS WEIGHT=2.2GRAMS TYPICAL NOTE: ALL DIMENSIONS ARE ±0.010 INCHES UNLESS OTHERWISE LABELED. ORDERING INFORMATION MSK5250-3.3 H SCREENING BLANK= INDUSTRIAL; H= MIL-PRF-38534 CLASS H OUTPUT VOLTAGE 1.5=+1.5V; 1.7=+1.7V; 1.9=+1.9V; 2.5=+2.5V; 3.3=+3.3V; 5.0=+5.0V; 12=+12.0V GENERAL PART NUMBER The above example is a +3.3V, Military regulator. 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. 5 8548-44 Rev. G 4/12