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The RT9187A is a high-performance, 300mA 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 RT9187A also works with low-ESR ceramic capacitors, reducing the amount of board space necessary for power applications, critical in hand-held wireless devices.
The RT9187A consumes less than 0.1μA in shutdown mode and has fast turn-on time less than 100μs. The other features include ultra-low dropout voltage, high output accuracy, current limiting protection, and high ripple rejection ratio. Available in the SOT-23-5 and VDFN-6L 2x2 package.

Applications

  • CDMA/GSM Cellular Handsets
  • Portable Information Appliances
  • Battery-Powered Equipment
  • Laptop, Palmtops, Notebook Computers
  • Hand-Held Instruments
  • Mini PCI & PCI-Express Cards
  • PCMCIA & New Cards
Key Spec.
RT9187A
Status Active
Vin (min) (V) 2.5
Vin (max) (V) 5.5
Vout (min) (V) 2.7
Vout (max) (V) 2.8
Output Adj. Method Fixed
Accuracy (+/- %) 2
Iout (max) (mA) 300
Iq (typ) (uA) 210
Vdropout @ rated current (typ) (mV) 75 @ 0.3A
Cout Type Ceramic
Features Enable Input;Extra Low Noise;Low Dropout;OCP;Output Discharge;Stable with Ceramic Capacitor
Package Type VDFN2x2-6;SOT-25
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 : 75mV @ 300mA
  • Wide Operating Voltage Ranges : 2.5V to 5.5V
  • TTL-Logic-Controlled Shutdown Input
  • Low Temperature Coefficient
  • Current Limiting Protection
  • Thermal Shutdown Protection
  • Only 1μF Output Capacitor Required for Stability
  • High Power Supply Rejection Ratio
  • RoHS Compliant and 100% Lead (Pb)-Free
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