300mA, Low Noise, Ultra-Fast CMOS LDO Regulator


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The RT9198/A is designed for portable RF and wireless applications with demanding performance and space requirements. The RT9198/A 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 RT9198/A also works with low-ESR ceramic capacitors, reducing the amount of board space necessary for power applications, critical in hand-held wireless devices. The RT9198/A consumes less than 0.01μA in shutdown mode and has fast turn-on time less than 50μs. The other features include ultra low dropout voltage, high output accuracy, current limiting protection, and high ripple rejection ratio. Available in the SOT-23-3, SOT-23-5, TSOT-23-3, TSOT-23-5, SC-70-5, SC-82, MSOP-8 and WDFN-6L 2x2 packages, the RT9198/A also offers a range from 1.5V to 5.0V with 0.1V per step.


Key Spec.
RT9198 RT9198A
Status Active Active
Vin (min) (V) 2.5 2.5
Vin (max) (V) 5.5 5.5
Vout (min) (V) 1.5 1.5
Vout (max) (V) 5 5
Output Adj. Method Fixed Fixed
Accuracy (+/- %) 2 2
Iout (max) (mA) 300 300
Iq (typ) (uA) 90 90
Vdropout @ rated current (typ) (mV) 220 @ 0.3A 220 @ 0.3A
Cout Type Ceramic Ceramic
Features Enable Input;Extra Low Noise;High PSRR;Low Dropout;OCP;Stable with Ceramic Capacitor Enable Input;Extra Low Noise;High PSRR;Low Dropout;OCP;Stable with Ceramic Capacitor
Package Type SOT-23;SOT-25;TSOT-25 SOT-23;SOT-25;TSOT-25
  • Low-Noise for RF Application
  • Fast Response in Line/Load Transient
  • Quick Start-Up (Typically 50μs)
  • < 0.01μA Standby Current When Shutdown
  • Low Dropout : 220mV @ 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
  • Custom Voltage Available
  • RoHS Compliant and 100% Lead (Pb)-Free
TitleLast UpdateShareDownload
300mA, Low Noise, Ultra-Fast CMOS LDO Regulator2004/08/30
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300mA, Low Noise, Ultra-Fast CMOS LDO Regulator 2015/05/19
Technical Documents
TitleLast UpdateShareDownload
Power Mangement Components for Lithium-Ion Battery Powered Applications2020/12/30
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RT9198-33GBRSOT-253000 Not available Buy from Distributor