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Switching Regulator MSK 5030-2.5 - 6 Pages

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Catalogue excerpts

HIGH EFFICIENCY, WITCHING REGULATORS M.S.KENNEDY CORP. • Preset 2.5V, 3.3V or 5.0V Output Versions • User Programmable Soft-Start • User Programmable Current Limit • Contact MSK for MIL-PRF-38534 Qualification Status The MSK 5030 series are high efficiency, 4 amp, step-down switching regulators. The output voltage is configured for 2.5V, 3.3V or 5.0V internally and the input range is 4.5V to 30V. The operating frequency of the MSK 5030 is 300KHz and is internally set. An external "soft start" capacitor allows the user to control how quickly the output comes up to regulation voltage after the application of an input. An extremely low quiescent current of typically less than 0.5mA and 95% operating efficiency keeps the total internal power dissipation of the MSK 5030 down to an absolute minimum. A surface mount version, MSK 5040, is also available if desired. EQUIVALENT SCHEMATIC SOFT START TYPICAL APPLICATIONS Step-down Switching Regulator Microprocessor Power Source High Efficiency Low Voltage Subsystem Power Supply PIN-OUT INFORMATION

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Storage Temperature Range -65°C to +150°C Lead Temperature Range 300°C (10 Seconds) Case Operating Temperature MSK5030 Series -40°C to +85°C MSK5030B Series -55°C to +125°C Junction Temperature +150°C ○ Input Voltage Enable Voltage Output Current Sense Pin Voltage Thermal Resistance (Each MOSFET) ABSOLUTE MAXIMUM RATINGS ELECTRICAL SPECIFICATIONS Group A Subgroup Input Supply Range 2 Output not current limited Output Current Load Regulation 2 Line Regulation Quiescent Power Consumption 2 Fault Sink Enable Input Voltage 2 Enable Input Current 2 Disabled Quiescent Current 2 Current Limit Threshold VIN=Enable,...

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APPLICATION NOTES INPUT CAPACITOR SELECTION: CURRENT LIMITING: The MSK 5030 is equipped with a pair of sense pins that are used to sense the load current using an external resistor (Rs). The current-limit circuit resets the main PWM latch and turns off the internal high-side MOSFET switch whenever the voltage difference between Sense High and Sense Low exceeds 100mV. This limiting occurs in both current flow directions, putting the threshold limit at ±100mV. The tolerance on the positive current limit is ±20%. The external low-value sense resistor must be sized for 80mV/Rs to guarantee enough...

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APPLICATION NOTES CONT'D MODES OF OPERATION: Under heavy loads, the MSK 5030 operates in full PWM mode. Each pulse from the oscillator sets the internal PWM latch that turns on the high-side MOSFET. As the high-switch turns off, the synchronous rectifier latch is set. 60ns later the low-side MOSFET turns on until the start of the next clock cycle or until the inductor current crosses zero. Under fault conditions the current exceeds the ±100mV current-limit threshold and the high-side switch turns off. At light loads the inductor current does not exceed the 30mV threshold set by the minimum-current...

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TYPICAL PERFORMANCE CURVES EFFICIENCY vs LOAD CURRENT EFFICIENCY vs LOAD CURRENT EFFICIENCY vs LOAD CURRENT DROPOUT VOLTAGE vs LOAD CURRENT SWITCHING FREQUENCY vs LOAD CURRENT OUTPUT CURRENT vs TEMPERATURE

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MECHANICAL SPECIFICATIONS WEIGHT = 12 GRAMS TYPICAL NOTE: ALL DIMENSIONS ARE ±0.010 INCHES UNLESS OTHERWISE LABELED. ORDERING IN FORMA TION BLANK = INDUSTRIAL; B = MIL-PRF-38534 CLASS H OUTPUT VOLTAGE GENERAL PART NUMBER The above example is a +3.3V, Military regulator. 4707 Dey Road, Liverpool, New York 13088 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...

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