General Description

The RT9187 is a high-performance, 1A LDO regulator, offering extremely high PSRR and ultra-low dropout. Ideal for portable RF and wireless applications with demanding performance and space requirements.

A noise reduction pin is also available for further reduction of output noise. Regulator ground current increases only slightly in dropout, further prolonging the battery life. The RT9187 also works with low-ESR ceramic capacitors, reducing the amount of board space necessary for power applications, critical in hand-held wireless devices.

The RT9187 consumes less than 0.1μA in shutdown mode and has fast turn-on time less than 40μs. The other features include ultra-low dropout voltage, high output accuracy, current limiting protection, and high ripple rejection ratio. Available in the VDFN-8L 3x3 and SOP-8 (Exposed Pad) package.

Applications

CDMA/GSM Cellular Handsets

Battery-Powered Equipment

Laptop, Palmtops, Notebook Computers

Hand-Held Instruments

Mini PCI & PCI-Express Cards

PCMCIA & New Cards

Portable Information Appliances

Features

Ultra-Low-Noise for RF Application

Ultra-Fast Response in Line/Load Transient

Quick Start-Up (Typically 40μs)

<0.1μA Standby Current When Shutdown

Low Dropout : 240mV at 1A

Wide Operating Voltage Ranges : 2.5V to 5.5V

TTL-Logic-Controlled Shutdown Input

Current Limiting Protection

Thermal Shutdown Protection

Only 2.2μF Output Capacitor Required for Stability

High Power Supply Rejection Ratio

RoHS Compliant and 100% Lead (Pb)-Free