The RT9078 is a low-dropout (LDO) voltage regulator with enable function that operates from a 1.2V to 5.5V supply. It provides up to 300mA of output current in miniaturized packaging.

The feature of 2μA low quiescent current and 0.5μA shutdown current are ideal for the battery application with long service life. The other features include current limit function, over temperature protection and output discharge function.


  • Portable, Battery Powered Equipment
  • Ultra Low Power Microcontrollers
  • Notebook Computers
Key Spec.
Status Active
Vin (min) (V) 1.2
Vin (max) (V) 5.5
Vout (min) (V) 0.8
Vout (max) (V) 3.45
Output Adj. Method Fixed;Resistor
Accuracy (+/- %) 2
Iout (max) (mA) 300
Iq (typ) (uA) 2
Vdropout @ rated current (typ) (mV) 150 @ 0.3A
Bias Rail No
Cout Type Ceramic;Tantalum
Charge Pump No
Features Enable Input;Low Dropout;OCP;Stable with Ceramic Capacitor
Package Type ZQFN1x1-4;TSOT-25
  • Input Voltage Range : 1.2V to 5.5V
  • 2μA Ground Current (IQ) at no Load
  • PSRR = 75dB at 1kHz
  • Adjustable Output Voltage Range :
    ► 0.8V to 5V (TSOT-23-5 Package with SNS Pin Only)
  • ±2% Output Accuracy
  • Low (0.1μA) Shutdown Current
  • Dropout Voltage : 0.15V at 300mA when VOUT ≥ 3V
  • Support Fixed Output Voltage 0.8V, 1.0V, 1.05V, 1.1V, 1.2V, 1.25V, 1.3V, 1.5V, 1.8V, 1.85V, 2V, 2.5V, 2.8V, 2.85V, 3V, 3.1V, 3.3V, 3.45V
  • Current Limit Protection
  • Over Temperature Protection
  • Output Active Discharge Function
  • TSOT-23-5 and ZQFN-4L 1x1 (ZDFN-4L 1x1) Packages Available
TitleLast UpdateShareDownload
2μA IQ, 300mA Low-Dropout Linear Regulator2016/02/04
Technical Documents
TitleLast UpdateShareDownload
Richtek Selection Guide [Oct., 2022]2022/10/01
Multi-Source Power Management Design2022/04/26
Power IC Solutions for IoT/Portable/Wearable/Battery-Powered Applications [Sep., 2018]2018/09/01
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
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RT9078N-12GJ5TSOT-253000 Not available Not available
RT9078N-18GJ5TSOT-253000 Not available Not available
RT9078N-33GJ5TSOT-253000 Not available Not available