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LP3928TL-1828 |LP3928TL1828NSN/a12000avaiHigh Speed Bi-Directional Level Shifter and Ultra Low-Dropout CMOS Voltage Regulator


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LP3928TL-1828
High Speed Bi-Directional Level Shifter and Ultra Low-Dropout CMOS Voltage Regulator
LP3928
High Speed Bi-Directional Level Shifter and Ultra
Low-Dropout CMOS Voltage Regulator
General Description

The LP3928is designedfor portable and wireless applica-
tions with demanding performance and space requirements.
The LP3928 provides level shifting and power conversion
neededfor applications interfacing differing voltage levels.
The part containsa bi-directional level shifterfor three sig-
nalsto translatethe levels between 1.8V and 2.85V andan
ultra low-dropout CMOS 2.85V voltage regulator.
The three level shifted signalsare individually direction con-
trolled. Signals going from 2.85Vto 1.8V can alsobe latched
usingan external clock source. The latches are powered
from internal 2.85V. Thereis alsoan optionto by-pass the
latches.
The built-in low-dropout voltage regulatoris idealfor mobile
phone and battery powered wireless applications.It providesto 150 mA froma 3.05Vto 6.0V input, andis character-
izedby extremely low dropout voltage,low quiescent current
and low output noise voltage.Itis stable with small 1.5µF
±30% ceramic and high quality tantalum output capacitors,
requiring smallest possiblePC board area. shutdown modeis availablefor the level shifters and the
regulator. High performanceis achieved over various load
conditions with very low rise andfall times.
Key Specifications

Level Shifter:4ns propagation delay (typ.)2ns rise andfall times (typ.)20ns direction switch response time2µA input/output leakage current
Low-Dropout Regulator: 3.05Vto 6.0V input range 150 mA guaranteed output Fast Turn-On time: 200µs (typ.) 100 mV maximum dropout with 150 mA load
Features
Ultra small micro SMD package Bi-directional level-shifterfor three individual signals:
1.8Vto 2.85V and 2.85Vto 1.8V signal level translation Logic controlled enable pins:4 different operation
modes LDO stable with ceramic and high quality tantalum
capacitors Thermal shutdown
Applications
Multi-Media Cardsfor Cellular Phones SD Cardsfor Cellular Handsets Logic Level Translation Portable Information Appliances
October 2002
LP3928
High
Speed
Bi-Directional
Level
Shifter
and
Ultra
Low-Dropout
CMOS
oltage
ic,good price


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