The RT9167/A is a 300mA/500mA low dropout and low noise micropower regulator suitable for portable applications. The output voltages range from 1.5V to 5V in 100mV increments and 2% accuracy. The RT9167/A is designed for use with very low ESR capacitors. The output remains stable even with 1μF ceramic output capacitor.
The RT9167/A uses an internal P-MOSFET as the pass device, which does not cause extra GND current in heavy load and dropout conditions. The shutdown mode of nearly zero operation current makes the IC suitable for battery-powered devices. Other features include a reference bypass pin to improve low noise performance, current limiting, and over temperature protection.


  • Cellular Telephones
  • Laptop, Notebook, and Palmtop Computers
  • Battery-powered Equipment
  • Hand-held Equipment
Key Spec.
RT9167 RT9167A
Status Active Active
Vin (min) (V) 2.9 2.9
Vin (max) (V) 7 7
Vout (min) (V) 1.5 1.5
Vout (max) (V) 5 5
Output Adj. Method Fixed Fixed
Accuracy (+/- %) 2 2
Iout (max) (mA) 300 500
Iq (typ) (uA) 90 90
Vdropout @ rated current (typ) (mV) 350 @ 0.3A;600 @ 0.5A 350 @ 0.3A;600 @ 0.5A
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 SOP-8;SOT-25 SOP-8;SOT-25
  • Stable with Low-ESR Output Capacitor
  • Low Dropout Voltage (350mV @ 300mA)
  • Low Operation Current -80μA Typical
  • Shutdown Function
  • Low Noise Output
  • Low Temperature Coefficient
  • Current and Thermal Limiting
  • Custom Voltage Available
  • SOT-23-5 and SOP-8 Packages
  • RoHS Compliant and 100% Lead (Pb)-Free
TitleLast UpdateDownload
Low-Noise, Fixed Output Voltage,300mA/500mA LDO Regulator2003/12/31
Title Last Update ShareDownload
Low-Noise, Fixed Output Voltage,300mA/500mA LDO Regulator 2015/05/19
Technical Documents
TitleLast UpdateDownload
Richtek Selection Guide [Oct., 2022]2022/10/01
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RT9167-50GBSOT-253000 Request Buy from Distributor
RT9167A-33GBSOT-253000 Request Buy from Distributor