MIC5191 Ultra High-Speed, High-Current Active Filter / LDO Controller General Description Features The MIC5191 is an ultra high-speed linear regulator. It Input voltage range: V = 1.0V to 5.5V IN uses an external N-Channel FET as its power device. +1.0% initial output tolerance The MIC5191 s ultra high-speed abilities can handle the Dropout down to 25mV 10A fast load demands of microprocessor cores, ASICs, and Filters out switching frequency noise on input other high-speed devices. Signal bandwidths of greater Very high large signal bandwidth >500kHz than 500 kHz can be achieved with a minimum amount of capacitance while at the same time keeping the output PSRR >40dB at 500kHz voltage clean, regardless of load demand. A powerful Adjustable output voltage down to 1.0V output driver delivers large MOSFETs into their linear Stable with any output capacitor regions, achieving ultra-low dropout voltage. Excellent line and load regulation specifications 1.25V 10% can be turned into 1V 1% without the use IN Logic controlled shutdown of a large amount of capacitance. Current limit protection MIC5191 (1.0V reference) is optimized for output voltages 10-pin MLF and MSOP-10 packages of 1.0V and higher. Available 40C to +125C junction temperature The MIC5191 is offered in 10-pin 3mm3mm MLF and 10-pin MSOP-10 packages and has an operating junction temperature range of 40C to +125C. Applications Data sheets and support documentation can be found on Distributed power supplies Micrels web site at www.micrel.com. ASIC power supplies DSP, P, and C power supplies Typical Application V = 12V CC C1 0.01F V 1.2V V 1.0V 7A IN IR3716S OUT MIC5191 IS OUT VIN VCC1 FB C2 10F VCC2 PGND EN SGND C3 COMP 0.01F R3 GND GND PowerPAK is a trademark of Siliconix, Inc. MLF and MicroLeadFrame are registered trademarks of Amkor Technology, Inc. Micrel Inc. 2180 Fortune Drive San Jose, CA 95131 USA tel +1 (408) 944-0800 fax + 1 (408) 474-1000 Micrel, Inc. MIC5191 Ordering Information Part Number Junction Voltage Package Temperature Range Standard Pb-Free MIC5191BML MIC5191YML Adj. 40 to +125C 10-Pin 3mm x 3mm MLF MIC5191BMM MIC5191YMM Adj. 40 to +125C 10-Pin MSOP Pin Configuration VIN 1 10 IS VIN 1 10 IS FB 2 9 PGND FB 2 9 PGND SGND 3 8 OUT SGND 3 8 OUT VCC1 4 7 VCC2 VCC1 4 7 VCC2 COMP 5 6 EN COMP 5 6 EN 10-Pin 3mm x 3mm MLF (ML) 10-Pin MSOP (MM) Top View Top View Pin Description Pin Number Pin Name Pin Function 1 VIN Input voltage (current sense +). 2 FB Feedback input to error amplifier. 3 SGND Signal ground. 4 VCC1 Supply to the internal voltage regulator. 5 COMP Error amplifier output for external compensation. 6 EN Enable (Input): CMOS-compatible. Logic high = Enable, Logic low = Shutdown. Do not float pin. 7 VCC2 Power to output driver. 8 OUT Output drive to gate of power MOSFET. 9 PGND Power ground 10 IS Current sense. M9999-122206 December 2006 2