General Description
    The EMP891X series is a family of CMOS linear regulators,which include EMP8915 and EMP8916, featuring ultra-high power supply rejection ratio, low output voltage noise, low dropout voltage, low quiescent current and fast transient response. EMP891X guarantees delivery of 150mA output current, and supports preset 1.2V, 1.3V, 1.5V, 1.8V, 2.5V, 2.8V, 2.85V output voltage versions. Based on its low quiescent current consumption and its less than 1μA shutdown mode of logical operation, the EMP891X series are ideal for battery-powered applications. The ground current increases only slightly in dropout, further prolonging the battery life.
    EMP891X series provide fast turn-on 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 EMP891X 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 regulation fault detection, bandgap voltage reference, constant current limiting and thermal overload protection. Available in miniature SOT-25, SOT-26 and TDFN-6 packages, the EMP891X series are suitable for portable appliances. EMP products is RoHS compliant.
Features
􀂄 Miniature SOT-25, SOT-26 and TDFN-6 packages
􀂄 150mA guaranteed output current
􀂄 75dB typical PSRR at 1kHz (60dB typical at 10KHz)
􀂄 30μV RMS output voltage noise (10Hz to 100kHz)
􀂄 65mV typical dropout at 150mA
􀂄 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
􀂄 ±1% output voltage tolerance for Vout 1.5V

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