High PSRR, Low Dropout, 400mA Adjustable LDO Regulator


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The RT9043 is a high-performance, 400mA LDO regulator, offering high PSRR and low dropout. The quiescent current is as low as 35μA, further prolonging the battery life. The RT9043 also works with low-ESR ceramic capacitors, reducing the amount of board space necessary for power applications, critical in handheld wireless devices.

The RT9043 consumes typical 0.7μA in shutdown mode. The other features include low dropout voltage, high output accuracy, current limit protection, and enable/shutdown control. The RT9043 is available in the SOT-23-5 package.


  • Mega SIM Card
  • CDMA/GSM Cellular Handsets
  • Portable Information Appliances
  • Laptop, Palmtops, Notebook Computers
  • Hand-Held Instruments
  • Mini PCI & PCI-Express Cards
  • PCMCIA & New Cards
  • Notebooks
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High PSRR, Low Dropout, 400mA Adjustable LDO Regulator2009/02/05
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High PSRR, Low Dropout, 400mA Adjustable LDO Regulator 2015/05/19
Technical Documents
TitleLast UpdateShareDownload
Oct., 2019 Richtek Selection Guide2019/11/06
Additional Documents
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Power Management Introduction and Selection Guide 2019/03/04
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RT9043GBSOT-253000 Request Buy from Distributor