MIC5236 Low Quiescent Current µCap LDO Regulator - Micrel - #1

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July 2005 1 MIC5236 MIC5236 Micrel, Inc. MIC5236 Low Quiescent Current ìCap LDO Regulator General Description The MIC5236 is a low quiescent current, ìCap low-dropout regulator. With a maximum operating input voltage of 30V and a quiescent current of 20ìA, it is ideal for supplying keep-alive power in systems with high-voltage batteries. Capable of 150mA output, the MIC5236 has a dropout voltage of only 300mV. It can also survive an input transient of –20V to +60V. As a ìCap LDO, the MIC5236 is stable with either a ceramic or a tantalum output capacitor. It only requires a 1.0ìF output capacitor for stability. The MIC5236 includes a logic compatible enable input and an undervoltage error flag indicator. Other features of the MIC5236 include thermal shutdown, current-limit, overvoltage shutdown, load-dump protection, reverse leakage protections, and reverse battery protection. Available in the thermally enhanced SOIC-8 and MSOP-8, the MIC5236 comes in fixed 2.5V, 3.0V, 3.3V, 5.0V, and adjustable voltages. For other output voltages, contact Micrel. Typical Application IGND = 20ìA VOUT 3.0V/100ìA VIN 30V IN MIC5236 EN OUT GND ERR Regulator with Low IO and Low IQ Features • Ultra-low quiescent current (IQ = 20ìA @IO = 100ìA) • Wide input range: 2.3V to 30V • Low dropout: 230mV @50mA; 300mV @150mA • Fixed 2.5V, 3.0V, 3.3V, 5.0V, and Adjustable outputs • ±1.0% initial output accuracy • Stable with ceramic or tantalum output capacitor • Load dump protection: –20V to +60V input transient survivability • Logic compatible enable input • Low output flag indicator • Overcurrent protection • Thermal shutdown • Reverse-leakage protection • Reverse-battery protection • High-power SOIC-8 and MSOP-8 Applications • Keep-alive supply in notebook and portable personal computers • Logic supply from high-voltage batteries • Automotive electronics • Battery-powered systems Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com COUT VOUT 3.0V/150mA VIN 5V VERR IN MIC5236 EN 47k OUT GND ERR Regulator with Error Output VOUT 3.0V/150mA VIN 5V IN R1 R2 MIC5236 EN OUT GND ADJ Regulator with Adjustable Output