MIC5234 Low-Quiescent Current 150mA LDO Regulator General Description Features The MIC5234 is a low-quiescent current, Cap low- Ultra-low quiescent current (I = 20 A I = 100 A) Q O dropout regulator. With a maximum operating input voltage Wide input voltage range: 2.3V to 30V of 30V and quiescent current of 20A, it is ideal for Low dropout: supplying keep-alive power in systems with high-voltage 230mV 50mA batteries. 320mV 150mA Capable of 150mA output, the MIC5234 has a dropout Adjustable output voltage voltage of only 320mV. It can also survive an input transient of 20V to +32V. The MIC5234 requires only a Typical 1.0% initial output accuracy 2.2 F output capacitor for stable operation. Logic compatible enable input The MIC5234 includes a logic compatible enable input. Overcurrent protection Other features of the MIC5234 include thermal shutdown, Thermal-shutdown protection current limit, overvoltage shutdown, load dump protection, Reverse-leakage and reverse-battery protection reverse-leakage and reverse battery protection. Thermally enhanced 8-pin ePad SOIC package The MIC5234 is available in an 8-pin ePad SOIC package with a junction operating range from 40 C to +125C. Data sheets and support documentation can be found on Applications Micrels web site at: www.micrel.com. Keep-alive supply in notebook and portable personal computers Logic supply from high-voltage batteries Automotive electronics Battery-powered systems Typical Application Regulator with Adjustable Output Micrel Inc. 2180 Fortune Drive San Jose, CA 95131 USA tel +1 (408) 944-0800 fax + 1 (408) 474-1000 Micrel, Inc. MIC5234 Ordering Information (1) Part Number Voltage Junction Temperature Range Package Lead Finish MIC5234YME Adjustable 40C to +125 C 8-Pin ePad SOIC NiPdAu Note: 1. ePad SOIC is a Green RoHS-compliant package. Mold compound is halogen free. Pin Configuration 8-Pin ePad SOIC Pin Description Pin Number Pin Name Pin Function 1 VOUT Regulated Output. 2, 3, 6 NC No Connect. 4 ADJ Adjustable Feedback Input. Connect to voltage divider network. 5 EN Enable (Input). Logic low = shutdown logic high = enabled. Do not leave floating. 7 GND Ground. 8 VIN Power Supply Input. EP ePad Exposed Thermal Pad. Connect to the ground plane to maximize thermal performance. M9999-092711-B September 2011 2