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发布者:微桥 发布时间:2011/8/4 阅读:5031次    关键字: EMP893X
EMP893X-Fast Ultra High-PSRR,Low-Noise 300mA LDO


EMP893X-Fast Ultra High-PSRR,Low-Noise,Low-Dropout,300mA Micropower CMOS Linear Regulator DataSheet

General Description
    The EMP893X series is a family of CMOS linear regulators. It is consisted of EMP8935, EMP8936 and EMP8938, featuring ultra-high power supply rejection ratio, low output voltage noise, low dropout voltage, low quiescent current and fast transient response. It guarantees delivery of 300mA output current, and
supports preset 1.2V, 1.5V, 1.8V, 2.5V, 2.7V, 2.8V, 3.0V,3.3V output voltage versions.
    Based on its low quiescent current consumption and its less than 1μA shutdown mode of logical operation, the EMP893X is ideal for battery-powered applications. It
provides fast turn-on and start-up time by using dedicated circuitry to pre-charge an optional external bypass capacitor. This bypass capacitor is used to reduce the output voltage noise without adversely affecting the load transient response. The high power supply rejection ratio of the EMP893X holds well for low
input voltages typically encountered in batteryoperated systems. The regulator is stable with small ceramic capacitive loads (2.2μF typical).
    Additional features include regulation fault detection, bandgap voltage reference, constant current limiting and thermal overload protection. The EMP893X is Available in miniature SOT-23-5, SOT-23-6, TDFN-6 and MSOP-8 packages.

Features
􀂄 Miniature SOT-23-5, SOT-23-6, MSOP-8 and TDFN-6 packages
􀂄 300mA guaranteed output current
􀂄 75dB typical PSRR at 1kHz (60dB typical at 10KHz)
􀂄 30μV RMS output voltage noise (10Hz to 100kHz)
􀂄 110mV typical dropout at 300mA for MSOP-8
􀂄 106μA typical quiescent current
􀂄 less than 1μA typical shutdown mode
􀂄 Fast line and load transient response
􀂄 80μs typical fast turn-on time
􀂄 2.5V to 5.5V input range
􀂄 Stable with small ceramic output capacitors
􀂄 Over temperature and over current protection
􀂄 ±2% output voltage tolerance


Applications
􀂄 Wireless handsets
􀂄 PCMCIA cards
􀂄 DSP core power
􀂄 Hand-held instruments
􀂄 Battery-powered systems
􀂄 Portable information appliances

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