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


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The RT9193 is designed for portable RF and wireless applications with demanding performance and space requirements. The RT9193 performance is optimized for battery-powered systems to deliver ultra low noise and low quiescent current. A noise bypass pin is available for further reduction of output noise. Regulator ground current increases only slightly in dropout, further prolonging the battery life. The RT9193 also works with low-ESR ceramic capacitors, reducing the amount of board space necessary for power applications, critical in hand-held wireless devices. The RT9193 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 SC-70-5, SOT-23-5, TSOT-23-5, WDFN-6L 2x2 and MSOP-8 packages.


  • CDMA/GSM Cellular Handsets
  • Battery-Powered Equipment
  • Laptop, Palmtops, Notebook Computers
  • Hand-Held Instruments
  • PCMCIA Cards
  • Portable Information Appliances
  • Mobile phone
  • Tablet
  • Notebook
Key Spec.
Status Active
Vin (min) (V) 2.5
Vin (max) (V) 5.5
Vout (min) (V) 1.5
Vout (max) (V) 5
Output Adj. Method Fixed
Accuracy (+/- %) 2
Iout (max) (mA) 300
Iq (typ) (uA) 90
Current Limit (typ) (mA) 400
Vdropout @ rated current (typ) (mV) 220 @ 0.3A
Cout (min) (uF) 1
Cout Type Ceramic
Features Enable Input;Extra Low Noise;High PSRR;Low Dropout;OCP;Stable with Ceramic Capacitor
Package Type MSOP-8;SOT-25;TSOT-25;WDFN2x2-6
  • Ultra Low Noise for RF Application
  • Ultra 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
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300mA, Ultra-Low Noise, Ultra-Fast CMOS LDO Regulator2004/08/30
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300mA, Ultra-Low Noise, Ultra-Fast CMOS LDO Regulator 2015/05/19
Technical Documents
TitleLast UpdateShareDownload
Analyzing VIN overstress in Power ICs2016/10/19
Power Mangement Components for Lithium-Ion Battery Powered Applications2015/11/23
Additional Documents
Title Last Update ShareDownload
Power IC Solutions for Portable/Wearable/Battery-Powered Applications 2017/11/16
Power Management Components for Lithium-Ion Battery Powered Applications
Power Management Introduction and Selection Guide 2017/11/16
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RT9193-18GBSOT-253000 Not available Buy from Distributor
RT9193-25GBSOT-253000 Not available Buy from Distributor
RT9193-28GBSOT-253000 Not available Buy from Distributor
RT9193-33GBSOT-253000 Not available Buy from Distributor