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发布者:微桥 发布时间:2011-8-2 阅读:4091次    关键字: EMP8020
EMP8020-Fast Ultra High-PSRR,Low-Noise 300mA LDO


 
General Description
    The EMP8020 low-dropout (LDO) CMOS linear regulator features an ultra-high power supply rejection ratio (78Db at 1kHz), low output voltage noise (48μV), low dropout voltage, low quiescent current (50μA), and fast transient response. It guarantees a delivery of 300mA output current, and supports preset output voltages ranging from 0.8V to 4.75V with 0.05V increments.
    The EMP8020 is ideal for battery-powered applications because of its low quiescent current consumption and its 1nA shutdown mode. The regulator 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
    EMP8020 holds well for low input voltages typically encountered in battery operated systems. The regulator is stable with small ceramic capacitive loads (2.2μF typical). Additional features include bandgap voltage reference, constant current limiting, and thermal overload protection. Both of Miniature 5-pin SC-70-5/SOT-23-5 and 4-pin SC-82-4 package options are offered to provide flexibility for different applications.
 
Applications
􀂄 Wireless handsets
􀂄 PCMCIA cards
􀂄 DSP core power
􀂄 Hand-held instruments
􀂄 Battery-powered systems
􀂄 Portable information appliances
 
Features
􀂄 Miniature SC-70-5,SOT-23-5 and SC-82-4 packages
􀂄 300mA guaranteed output current
􀂄 PSRR 78dB typical at 1kHz 70dB typical at 10kHz
􀂄 48μV RMS output voltage noise (10Hz to 100kHz) (Vout=2.8V, Cbypass=10nF)
􀂄 305mV typical dropout at 300mA (Vout=2.8V)
􀂄 50μA typical quiescent current
􀂄 1nA typical shutdown mode
􀂄 Fast line and load transient response
􀂄 140μs typical fast turn-on time (Vout=2.8V, Cbypass=10nF)
􀂄 2.2V to 5.5V input range
􀂄 Stable with small ceramic output capacitors
􀂄 Over-temperature and over-current protection
􀂄 ±2% output voltage tolerance
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