Fremont Micro Devices FT531xx
www.fremontmicro.com Page 1 of 23 DS531-A8
Ultra Low Noise, High PSRR, 250mA LDO
FEATURES
DESCRIPTION
¾ Ultra-Low Noise for RF Application
¾ Ultra-Fast Response in Line/Load Transient
¾ Quick Start-Up (Typically 100uS)
¾ Low Quiescent Current: 36uA
¾ Less than 0.1uA Standby Current When
Shutdown
¾ Low Dropout Voltage: 120mV @ 100mA
¾ Wide Operating Voltage Ranges : 2.5V to 6V
¾ TTL-Logic-Controlled Shutdown Input
¾ Low Temperature Coefficient
¾ Current Limiting Protection
¾ Only 1uF Output Capacitor Required
¾ High Power Supply Rejection Ratio
¾ ROHS Compliant and 100% Lead (Pb)-Free
¾ Custom Voltage Available
¾ Custom Options for CE Logic and Build-in
Pull-up/down Available
The FT531xx is designed for portable RF and
wireless applications with demanding performance
and space requirements. The FT531xx performance is
optimized for battery powered systems to deliver
ultra low noise and low quiescent current. Regulator
ground current increases only slightly in dropout,
further prolonging the battery life.
The FT531xx also works with low-ESR ceramic
capacitors, reducing the amount of board space
necessary for power applications, critical in
hand-held wireless devices. The FT531xx consumes
less than 0.1uA in shutdown mode and has fast
turn-on time less than 100uS. The other features
include low dropout voltage, high output accuracy,
current limiting protection, and high ripple rejection
ratio. The FT531xx is available in the 5-lead of
SOT-23-5(L), SC-70 and the 3-lead of SOT-23-3(L),
SOT-89-3(L), SOT-23 packages.
APPLLICATIONS
¾ CDMA/GSM Cellular Handsets
¾ Battery-Powered Equipment
¾ Laptop, Palmtops, Notebook Computers
¾ Hand-Held Instruments
¾ PCMCIA Cards
¾ Portable Information Appliances
