4707 dey road liverpool, n.y. 13088 m.s.kennedy corp. (315) 701-6751 features: series very low output voltage available in 0.7v, 0.8v, 0.9v, 1.0v, 1.2v, 1.3v and 1.5v on board thermal shut down and current limit 1% maximum guaranteed accuracy output current to 5 amps alternate output voltages available contact msk for mil-prf-38534 qualification status description: the msk 5450 series voltage regulators offer high current and low output voltage capability ideal for use with low voltage microprocessors. low output impedance and minimal output capacitance requirements make the msk 5450 an excellent choice for asic and fpga core voltage supplies. the device is available in +0.7v, +0.8v, +0.9v, +1.0v, +1.2v, +1.3v and +1.5v output configurations with output accuracy guaranteed to 1% maximum. the msk 5450 series is packaged in a 3 pin hermetically sealed power surface mount ceramic package. equivalent schematic 5450 typical applications pin-out information pld/fpga core power supply asic core voltage regulator system power supplies switching power supply post regulators linear point-of-load conversion v in v out ground 1 2 3 1 preliminary rev. a 11/09 mil-prf-38534 certified high current, very low output surface mount voltage regulators
msk5450-0.7 msk5450-0.8 msk5450-0.9 msk5450-1.0 msk5450-1.2 msk5450-1.3 msk5450-1.5 input voltage power dissipation +6.0v internally limited vin p d t st t ld t j absolute maximum ratings 2 electrical specifications +0.7v +0.8v +0.9v +1.0v +1.2v +1.3v +1.5v output voltage 7 part number 1 2 3 4 5 6 7 8 9 10 notes: output decoupled to ground using 10f minimum capacitor unless otherwise specified. this parameter is guaranteed by design but need not be tested. typical parameters are representative of actual device performance but are for reference only. all output parameters are tested using a low duty cycle pulse to maintain t j = t c . industrial grade and "e" suffix devices shall be tested to subgroup 1 unless otherwise specified. military grade devices ('h' suffix) shall be 100% tested to subgroups 1,2,3. subgroup 1 subgroup 2 subgroup 3 please consult the factory if alternate output voltages are required. due to internal thermal shutdown, maximum output current may not be available at all values of vin-vout and temperatures. see typical performance curves for clarification. not applicable to versions where vin=vin min. continuous operation at or above absolute maximum ratings may adversely effect the device performance and/or life cycle. t c = +25c t j = +125c t a = -55c 10 preliminary rev. a 11/09 -65c to +150c 300c -40c to +85c -55c to +125c storage temperature range lead temperature (10 seconds) operating temperature msk 5450 series msk 5450h/e series
] first, the power dissipation must be calculated as follows: power dissipation = (vin - vout) x i out + vin x quiescent current next, the user must select a maximum junction temperature. the equation may now be arranged to solve for the required heat sink to ambient thermal resistance (r sa). example: an msk 5450-1.3 is configured for vin=+1.8v and vout=+1.3v. iout is a continuous 5amp dc level. under these conditions the maximum ground current would be 150ma. the ambient tempera- ture is +100c and the maximum junction temperature is 125c. r jc = 2.0c/w and r cs = 0.5c/w typically. power dissipation = (1.8v - 1.3v) x 5a + (1.8 x 150ma) solve for r sa given p d : = 2.77 watts r sa = 125c - 100c - 2.0c/w - 0.5c/w in this example, a heat sink with a thermal resistance of no more than 6.5c/w must be used to maintain a junction tem- perature of no more than 125c. application notes regulator protection: the msk 5450 series are high performance linear regulators for high current, low voltage applications requiring fast tran- sient response. the devices are fully protected from damage due to fault conditions, offering constant current limiting and thermal shutdown. the thermal shutdown junction tempera- ture is typically 150c. input capacitor: output capacitor: the msk 5450 series devices require a minimum of external components to maintain stability. a minimum of output ca- pacitance is necessary for stable operation. due to the wide bandwidth design, the device will operate with a wide range of capacitance and esr values. for most applications, a 10uf ceramic capacitor will suffice. ideally, this should be an x7r ceramic capacitor or a tantalum capacitor due to their thermal performance. there is no upper limit to the amount of output capacitance that may be used. 3 2.77w package connections: the msk 5450 series are highly thermally conductive devices and the thermal path from the package heat sink to the internal junc- tions 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. heat sink selection: to select a heat sink for the msk 5450, the following for- mula for convective heat flow may be used: [ = 6.53c/w minimizing power dissipation: to maximize the performance and reduce power dissipation of the msk 5450 series devices, vin should be maintained as close to dropout or at vin minimum when possible. see input supply voltage requirements. a series resistor can be used to lower vin close to the dropout specification, lowering the in- put to output voltage differential. in turn, this will decrease the power that the device is required to dissipate. knowing peak current requirements and worst case voltages, a resistor can be selected that will drop a portion of the excess voltage and help to distribute the heating. the circuit below illustrates this method. if the device is to be located more than 4 inches from the bulk supply capacitance, a minimum 1uf capacitor should be placed as close to the input pin as possible for proper bypassing. a smaller value capacitor such as 0.01uf should be placed in parallel with the larger value capacitor. larger input capacitor values will help to improve ripple rejection. the maximum resistor value can be calculated from the following: r1 max = where: vin min - (vout max + v drop ) i out peak + quiescent current temperature range thermal shutdown: the msk 5450 series of devices is equipped with a thermal shut- down circuit that will turn off the device when the junction tem- perature reaches approximately 150c. it is important for the user to be aware that high temperature operation will limit the current capability of the device due to this thermal shutdown protection. in cases of maximum input voltage and high case temperature, the output current available may be less than 3 amps. see curve be- low for clarification. preliminary rev. a 11/09 vin min=minimum input voltage vout max=maximum output voltage across the full v drop =worst case dropout voltage (typically 500mv) i out peak=maximum load current quiescent current=max. quiescent current at iout peak
typical performance curves 4 preliminary rev. a 11/09
msk5450-1.3 h 5 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 qualification status. mechanical specifications m.s. kennedy corp. 4707 dey road, liverpool, new york 13088 phone (315) 701-6751 fax (315) 701-6752 www.mskennedy.com ordering information screening blank= industrial; e=extended reliability h= mil-prf-38534 class h output voltage 0.7=+0.7v; 0.8=+0.8v; 0.9=+0.9v; 1.0=+1.0v; the above example is a +1.3v, military regulator. note: all dimensions are 0.010 inches unless otherwise labeled. 1.2=+1.2v; 1.3=+1.3v; 1.5=+1.5v general part number weight=2.0 grams typical preliminary rev. a 11/09
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