Low Profile 500mA LDO with Enable and Power Good


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The RT9186A is a low-dropout linear regulator providing up to 500mA load current with 160mV dropout. It is especially designed for the application of portable and smart handheld device.

The RT9186A operates from 2.5V to 5.5V supply. The internal P-MOSFET pass transistor allows the regulator to work with 190μA low quiescent current. Its preset output voltage version covers the most frequently used values, including 1.8V/2.5V/3.3V. Output voltage can also be adjusted via the ADJ pin for those other than the preset values.

With only 0.1μA required in the shut down mode, one enable pin is able to control output on/off. The RT9186A contains PGOOD function.


  • Notebook Computer
  • PDAs/SHDs
  • PCMCIA/Cardbus Card Product
  • Mobile Phone
Key Spec.
Status Active
Vin (min) (V) 2.5
Vin (max) (V) 5.5
Vout (min) (V) 0.8
Vout (max) (V) 4.5
Output Adj. Method Fixed;Resistor
Accuracy (+/- %) 3
Iout (max) (mA) 500
Iq (typ) (uA) 190
Vdropout @ rated current (typ) (mV) 160 @ 0.5A
Bias Rail Yes
Cout Type Ceramic
Features Enable Input;Low Dropout;OCP;Power Good;Stable with Ceramic Capacitor
Package Type MSOP-8;VDFN3x3-8
  • 2.5V to 5.5V Wide Input Range
  • Guaranteed 500mA Output Current
  • Low 160mV Dropout at 500mA
  • 1.8V/2.5V/3.3V Preset Output Voltage Version with Adjustable Range from 0.8V to 4.5V
  • Power Good Output
  • Low 190μA Ground Pin Current
  • 0.1μA Shutdown Current
  • Thermal and Over Current Protection
  • RoHS Compliant and 100% Lead (Pb)-Free
TitleLast UpdateShareDownload
Low Profile 500mA LDO with Enable and Power Good2003/12/31
Technical Documents
TitleLast UpdateShareDownload
Richtek Selection Guide [Oct., 2020]2020/12/30
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RT9186AGFMSOP-82500 Not available Buy from Distributor
RT9186AGQVVDFN3x3-81500 Not available Buy from Distributor