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1 / 20 page July 2008 Rev 6 1/20 20 LD2982Axx LD2982Bxx Very low drop and low noise voltage regulator with inhibit function, low ESR capacitors compatible Features ■ Very low dropout voltage (120 mV at 50 mA and 7 mV at 1 mA load) ■ Very low quiescent current (375 mA typ. at 50 mA load and 75 mA at 1 mA) ■ Output current up to 50 mA ■ Logic controlled electronic shutdown ■ Output voltage of 1.8, 2.7, 3.2, 3.3 V ■ Internal current and thermal limit ■ Available in ± 1 % tolerance (at 25 °C, A version) ■ Supply voltage rejection: 45 dB (typ) ■ Only 1 µF for stability ■ Low output noise voltage 30 µVrms ■ Smallest package SOT23-5L ■ Temperature range: -40 °C to 125 °C Description The LD2982A/Bxx is a 50 mA fixed output voltage regulator. The ultra low drop voltage and the low quiescent current make them particularly suitable for low noise, low power applications, and in battery powered systems. In sleep mode quiescent current is less than 1 µA when INHIBIT pin is pulled low. Shutdown logic control function is available on pin 3 (TTL compatible). This means that when the device is used as local regulator, it is possible to put a part of the board in standby, decreasing the total power consumption. An external capacitor CBYP = 10 nF connected between bypass pin and GND reduce the noise to 30 µVrms. Typical application are in cellular phone, palmtop/laptop computer, personal digital assistant (PDA), personal stereo, camcorder and camera. SOT23-5L Table 1. Device summary Part numbers A Version B Version Output voltage LD2982AXX18 LD2982BXX18 1.8 V LD2982AXX27 LD2982BXX27 2.7 V LD2982AXX32 LD2982BXX32 3.2 V www.st.com |
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