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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.

Applications

  • CDMA/GSM Cellular Handsets
  • Battery-Powered Equipment
  • Laptop, Palmtops, Notebook Computers
  • Hand-Held Instruments
  • PCMCIA Cards
  • Portable Information Appliances
Key Spec.
RT9198 RT9198A
Status Last Time Buy  Last Time Buy 
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;Output Discharge;Stable with Ceramic Capacitor Enable Input;Extra Low Noise;High PSRR;Low Dropout;OCP;Output Discharge;Stable with Ceramic Capacitor
Package Type SOT-23;SOT-25;TSOT-25 SOT-23;SOT-25;TSOT-25
Outline Dimension, Footprint, Drawing Download Download
Features
  • 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
Part NumberPackage TypePackage Qty.DistributorStockBuy From Authorized Distributor
RT9198-18GBRSOT-253,000 Digikey 2,131 Last Time Buy
2026/06/30
0 Lead-Time: 14 weeks
RT9198-25GBRSOT-253,000 Digikey 0 Lead-Time: 14 weeks
2,998 Last Time Buy
2026/06/30
RT9198-25GJ5RTSOT-253,000 Digikey 3,000 Last Time Buy
2026/06/30
0 Lead-Time: 14 weeks
RT9198-28GBRSOT-253,000 Digikey 2,800 Last Time Buy
2026/06/30
3,000 Last Time Buy
2026/06/30
RT9198-30GBRSOT-253,000 Digikey 2,890 Last Time Buy
2026/06/30
2,998 Last Time Buy
2026/06/30
RT9198-33GBRSOT-253,000 Digikey 3,912 Last Time Buy
2026/06/30
0 Lead-Time: 14 weeks
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