Maximum 3A, Ultra Low Dropout Regulator


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The RT9018A/B is a high performance positive voltage regulator designed for use in applications requiring very low Input voltage and very low dropout voltage at up to 3A(Peak). It operates with a VIN as low as 1.4V and VDD voltage 3V with output voltage programmable as low as 0.8V. The significant feature includes ultra low dropout, ideal for applications where VOUT is very close to VIN. Additionally, there is an enable pin to further reduce power dissipation while shutdown. The RT9018A/B provides excellent regulation over variations in line, load and temperature. and provides a power OK signal to indicate if the voltage level of Vo reaches 90% of its rating value.
The RT9018A/B is available in the SOP-8 (Exposed Pad) and WDFN-10L 3x3 packages with 1V, 1.05V, 1.2V, 1.5V, 1.8V and 2.5V internally preset outputs that are also adjustable using external resistors.


  • Front Side Bus VTT (1.2V/3A)
  • NoteBook PC Applications
  • Motherboard Applications
Key Spec.
RT9018A RT9018B
Recommended Alternative  RT9059 RT9059
Vin (min) (V) 1.4 1.4
Vin (max) (V) 5.5 5.5
Vout (min) (V) 0.8 0.8
Vout (max) (V) 4 4
Output Adj. Method Fixed;Resistor Fixed;Resistor
Accuracy (+/- %) 1.5 1.5
Iout (max) (mA) 3000 3000
Iq (typ) (uA) 600 600
Vdropout @ rated current (typ) (mV) 210 @ 3A 210 @ 3A
Cout Type Ceramic Ceramic
Features Enable Input;Low Dropout;OCP;Power Good;SCP;Stable with Ceramic Capacitor Enable Input;Low Dropout;OCP;Power Good;SCP;Stable with Ceramic Capacitor
Package Type WDFN3x3-10;PSOP-8 WDFN3x3-10;PSOP-8
  • Maximum 3A Low-Dropout Voltage Regulator
  • High Accuracy Output Voltage ±1.5%
  • Typically 210mV Dropout at 3A
  • Power Good Output
  • Output Voltage Pull Low Resistance when Disable
  • Thermal and Over Current Protection
  • RoHS Compliant and 100% Lead (Pb)-Free
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Maximum 3A, Ultra Low Dropout Regulator 2015/05/19