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The RT9181 is a low dropout voltage regulator with an output 2% accuracy and supply a continuous 150mA current within operating range from a +3V to +5.5V input. The power good function monitors the output voltage and indicates by pulling low the power good output (open drain).

The RT9181 requires a small output capacitor with low ESR for stabilizing output voltage. The device also minimizes output overshoot during power up.

The RT9181 uses an internal P-MOSFET as the pass device, which consumes 160µA supply current independent of load and dropout conditions. The EN pin controls the output and consumes no input bias current. Other features include current limiting, over temperature protection, and under voltage lockout.

Applications

  • Processor Power-Up Sequencing
  • Laptop, Notebook, and Palmtop Computers
Key Spec.
RT9181
Status Active
Vin (min) (V) 3
Vin (max) (V) 5.5
Vout (min) (V) 1.2
Vout (max) (V) 1.8
Output Adj. Method Fixed
Accuracy (+/- %) 2
Iout (max) (mA) 150
Iq (typ) (uA) 160
Cout Type Ceramic
Features Enable Input;Low Dropout;OCP;Output Discharge;Power Good;Stable with Ceramic Capacitor
Package Type SOT-25
Features
  • Low Dropout Voltage Regulator
  • Up to 150mA Output Current
  • Power Good (PGOOD) Function
  • Chip Enable/Shutdown Function
  • Load Independent, Low Quiescent Current, 160µA
  • Current Limiting and Thermal Protection
  • Under Voltage Lockout (UVLO)
  • Low Variation Due to Load and Line Regulation
  • Output Stable with Low ESR Capacitors
  • SOT-23-5 Package
  • RoHS Compliant and 100% Lead (Pb)-Free
Please confirm with our distributor or sales representative for actual stock status.
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