MIC5191 MICREL [Micrel Semiconductor], MIC5191 Datasheet
MIC5191
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MIC5191 Summary of contents
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... General Description The MIC5191 is an ultra high-speed linear regulator. It uses an external N-Channel FET as its power device. The MIC5191's ultra high-speed abilities can handle the fast load demands of microprocessor cores, ASICs, and other high-speed devices. Signal bandwidths of greater than 500 kHz can be achieved with a minimum amount of capacitance while at the same time keeping the output voltage clean, regardless of load demand ...
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... Logic high = Enable, Logic low = Shutdown. Do not float pin. Power to output driver. Output drive to gate of power MOSFET. Power ground Current sense. 2 Package 10-Pin 3mm x 3mm MLF 10-Pin MSOP VIN PGND SGND 3 8 OUT VCC1 4 7 VCC2 COMP 10-Pin MSOP (MM) Top View MIC5191 ® M9999-122206 ...
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... J (4) ) .............................................60°C/W JA (5) ) ..............................................200°C/W JA < +125°C, unless noted. J Min Typ –1 –2 –0.1 0.005 0. 0.6 0.8 0.5 100 100 100 MIC5191 CC ≤ +125°C J Max Units + +0.1 %/V 1.01 V 0.5 % µ µA 15 µ µs 100 M9999-122206 ...
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... Micrel, Inc. Typical Characteristics December 2006 4 MIC5191 M9999-122206 ...
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... Micrel, Inc. Functional Characteristics December 2006 5 MIC5191 M9999-122206 ...
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... Micrel, Inc. Functional Diagram VCC1 EN December 2006 INTERNAL VOLTAGE REGULATOR OUTPUT CONTROL ENABLE AND LEVEL SHIFT COMP Figure 1. MIC5191 Block Diagram 6 VIN 50mV IS CURRENT LIMIT AMPLIFIER VCC2 OUT PGND FB 0.5V ERROR SGND AMPLIFIER MIC5191 M9999-122206 ...
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... December 2006 Enable The MIC5191 comes with an active-high enable pin that allows the regulator to be disabled. Forcing the enable pin low disables the regulator and sends it into a low off- mode-current state. Forcing the enable pin high enables the output voltage. The enable pin cannot be left floating ...
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... Micrel, Inc. Application Information Designing with the MIC5191 Anatomy of a transient response A voltage regulator can maintain a set output voltage while its exterior world is pushing and pulling in its demand for power. The measure of a regulator is generally how accurately and effectively it can maintain that voltage, regardless of how the load demands power ...
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... This allows the MIC5191 design to be tailored to each individual design. In designing the MIC5191 important to maintain adequate phase margin. This is generally achieved by having the gain cross the 0dB point with a single pole 20dB/decad roll-off. The compensation pin is configured as Figure 3 demonstrates ...
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... This will have the effect of both decreasing the voltage drop as well as returning closer and faster to the regulated voltage during the recovery time. MOSFET Selection The typical pass element for the MIC5191 Channel MOSFET. There are multiple considerations when choosing a MOSFET. These include: • ...
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... Output Capacitor The MIC5191 is stable with any type or value of output capacitor (even without any output capacitor!). This allows the output capacitor to select which parameters of the regulator are important. In cases where transient response is the most important, low ESR and low ESL ceramic capacitors are recommended ...
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... Another application for the MIC5191 active filter on the output of a switching regulator. This improves the power supply in several ways. First, using the MIC5191 as a filter on the output can significantly reduce high frequency noise. Switching power supplies tends to create noise at the switching GND frequency in the form of a triangular voltage ripple ...
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... It also reduces undershoot (Figure 12) and over-shoot (Figure 13) due to load transients with decreased capacitance. Figure 13. Transient Response Due to the high DC gain (80dB) of the MIC5191, it also adds increased output accuracy and extremely high load regulation. Distributed Power Supply As technology advances and processes move to smaller and smaller geometries, voltage requirements go down and current requirements go up ...
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... Micrel, Inc. Package Information December 2006 10-Pin MSOP (MM) ® 10-Pin 3mm x 3mm MLF (ML) 14 MIC5191 M9999-122206 ...
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... A Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk and Purchaser agrees to fully December 2006 indemnify Micrel for any damages resulting from such use or sale. © 2004 Micrel, Incorporated. 15 MIC5191 M9999-122206 ...