LP3928 Datasheet | National Semiconductor

Description The LP3928 is designed for portable and wireless applications with demanding performance and space requirements. The LP3928 provides level shifting and power conversion needed for applications interfacing differing voltage levels. The part contains a bi-directional level shifter for three signals to translate the levels between 1.8V and 2.85V and an ultra low-dropout CMOS 2.85V voltage regulator. The three level shifted signals are individually direction controlled. Signals going from 2.85V to 1.8V can also be latched using an external clock source. The latches are powered from internal 2.85V. There is also an option to by-pass the latches. The built-in low-dropout voltage regulator is ideal for mobile phone and battery powered wireless applications. It provides up to 150 m A from a 3.05V to 6.0V input, and is characterized by extremely low dropout voltage, low quiescent current and low output noise voltage. It is stable with small 1.5 µF ± 30% ceramic and high quality tantalum output capacitors, requiring smallest possible PC board area. A shutdown mode is available for the level shifters and the regulator. High performance is achieved over various load conditions with very low rise and fall times. n 2 ns rise and fall times (typ.) n 20 ns direction switch response time n 2 µA input/output leakage current Low-Dropout Regulator: n 3.05V to 6.0V input range n 150 m A guaranteed output n Fast Turn-On time: 200 µs (typ.) n 100 m V maximum dropout with 150 m A load Features n Ultra small micro SMD package n Bi-directional level-shifter for three individual signals: 1.8V to 2.85V and 2.85V to 1.8V signal level translation n Logic controlled enable pins: 4 different operation modes n LDO stable with ceramic and high quality tantalum capacitors n Thermal shutdown Applications n n n n Multi-Media Cards for Cellular Phones SD Cards for Cellular Handsets Logic Level Translation Portable Information Appliances Key Specifications Level Shifter: n 4 ns propagation...