LP3981

Product Folder Sample & Buy Technical Documents Tools & Software Support & Community Reference Design LP3981 SNVS159H – OCTOBER 2001 – REVISED JULY 2015 LP3981 Micropower, 300-mA Ultra-Low-Dropout CMOS Voltage Regulator 1 Features 1 2.5-V to 6-V Input Range 300-mA Output Current 60-dB PSRR at 1 kHz ≤ 1-μA Quiescent Current When Shut Down Fast Turnon Time: 120 μs (typical) with CBYPASS = 0.01 µF 132-mV Typical Dropout with 300-mA Load 35-μVrms Output Noise Over 10 Hz to 100 kHz Logic Controlled Enable Stable With Ceramic and High-Quality Tantalum Capacitors Thermal Shutdown and Short-Circuit Current Limit Low Thermal Resistance in WSON-6 Package Gives Excellent Power Capability 2 Applications CDMA Cellular Handsets Wideband CDMA Cellular Handsets GSM Cellular Handsets Portable Information Appliances 3 Description Performance of the LP3981 device is optimized for battery-powered systems to deliver ultra-low-noise, extremely low dropout voltage, and low quiescent current. Regulator ground current increases only slightly in dropout, further prolonging the battery life. Power supply rejection is better than 60 dB at low frequencies. This high power supply rejection is maintained down to lower input voltage levels common to battery-operated circuits. The device is ideal for mobile phone and similar battery-powered wireless applications. It provides up to 300 mA, from a 2.5-V to 6-V input, consuming less than 1 µA in disable mode. The LP3981 is a...