General Description
The EM1109 performs ultra- low drop voltage,
high power supply rejection ratio (PSRR), fast
response, low noise linear regulator, and designed
to continuously deliver up to 1A output current.
The EM1109 has wide adjustable output voltage
range and high output accuracy to 1.5%.
No by-pass capacitor is needed for this device
and only 4.7uF ceramic capacitor is required for
stability in any loading conditions. It reduces the
amount of board space necessary for power
applications.
The other features include soft start, current
limit protection, Power-On-Reset function, and
over temperature protection. The EM1109 is
available in DFN3X3-08L package.

Features
 Ultra Fast Response in Line/Load Transient
 Wide VIN Range from 2.5V to 5.5V
 Fixed Output Voltage from 1V to 3.3V
 Ultra Low Dropout Voltage: 450mV @1A
 Low Shutdown Current < 1uA
 Only 4.7uF Ceramic Capacitor required for
stability
 Over Temperature Protection
 Current Limit Protection
 RoHS Compliant and 100% Lead (Pb)-Free

Applications
 Cellular Handsets
 Battery-Powered Equipment
 Laptop, Palmtops, Notebook Computers
 Hand-Held Instruments
 PCMCIA Cards
 Portable Information Applications