MIC3975YMM

MIC3975 Micrel MIC3975 750mA Cap Low-Voltage Low-Dropout Regulator General Description Features The MIC3975 is a 750mA low-dropout linear voltage regula- Fixed and adjustable output voltages to 1.24V tors that provide low-voltage, high-current output from an 300mV typical dropout at 750mA extremely small package. Utilizing Micrels proprietary Super Ideal for 3.0V to 2.5V conversion eta PNP pass element, the MIC3975 offers extremely low Ideal for 2.5V to 1.8V or 1.65V conversion dropout (typically 300mV at 750mA) and low ground current Stable with ceramic capacitor (typically 6.5mA at 750mA). 750mA minimum guaranteed output current 1% initial accuracy The MIC3975 is ideal for PC add-in cards that need to con- Low ground current vert from standard 5V to 3.3V or 3.0V, 3.3V to 2.5V or 2.5V Current limiting and thermal shutdown to 1.8V or 1.65V. A guaranteed maximum dropout voltage Reversed-battery protection of 500mV over all operating conditions allows the MIC3975 Reversed-leakage protection to provide 2.5V from a supply as low as 3.0V and 1.8V or Fast transient response 1.65V from a supply as low as 2.25V. Low-prole MSOP-8 The MIC3975 is fully protected with overcurrent limiting, thermal shutdown, and reversed-battery protection. Fixed voltages of 5.0V, 3.3V, 3.0, 2.5V, 1.8V, and 1.65V are avail- Applications able. An adjustable output voltage option is available for Fiber optic modules voltages down to 1.24V. LDO linear regulator for PC add-in cards For other voltages, contact Micrel. PowerPC power supplies High-efciency linear power supplies SMPS post regulator Multimedia and PC processor supplies Battery chargers Low-voltage microcontrollers and digital logic Ordering Information Part Number Standard Pb-Free Voltage Junction Temp. Range Package MIC3975-1.65BMM MIC3975-1.65YMM 1.65V 40C to +125C MSOP-8 MIC3975-1.8BMM MIC3975-1.8YMM 1.8V 40C to +125C MSOP-8 MIC3975-2.5BMM MIC3975-2.5YMM 2.5V 40C to +125C MSOP-8 MIC3975-3.0BMM MIC3975-3.0YMM 3.0V 40C to +125C MSOP-8 MIC3975-3.3BMM MIC3975-3.3YMM 3.3V 40C to +125C MSOP-8 MIC3975-5.0BMM MIC3975-5.0YMM 5.0V 40C to +125C MSOP-8 MIC3975BMM MIC3975YMM Adj. 40C to +125C MSOP-8 Typical Applications 100k Error MIC3975BMM Flag V IN Output IN OUT 1.5V MIC3975-2.5BMM 2.5V V IN R1 IN OUT 2.5V 3.3V ENABLE EN ADJ R1 10 F SHUTDOWN ENABLE R2 ceramic EN FLG GND 10 F SHUTDOWN ceramic GND 1.5V/750mA Adjustable Regulator 2.5V/750mA Regulator with Error Flag Super eta PNP is a trademark of Micrel, Inc. Micrel, Inc. 2180 Fortune Drive San Jose, CA 95131 USA tel + 1 (408) 944-0800 fax + 1 (408) 474-1000 MIC3975 Micrel Pin Conguration EN 1 8 GND EN 1 8 GND IN 2 7 GND IN 2 7 GND FLG 3 6 GND ADJ 3 6 GND OUT 4 5 GND OUT 4 5 GND Adjustable MIC3975-x.x Fixed MSOP-8 (MM) Pin Description Pin No. Pin No. Pin Name Pin Function Fixed Adjustable 1 1 EN Enable (Input): CMOS-compatible control input. Logic high = enable, logic low or open = shutdown. 2 2 IN Supply (Input) 3 FLG Flag (Output): Open-collector error ag output. Active low = output under- voltage. 3 ADJ Adjustment Input: Feedback input. Connect to resistive voltage-divider net- work. 4 4 OUT Regulator Output 58 58 GND Ground MIC3975 2 February 2005