Low Dropout, 400mA Adjustable Linear Regulator


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The RT9053A is a high performance, 400mA LDO regulator and ultra low dropout. The quiescent current is as low as 42μA, further prolonging the battery life. The RT9053A also works with low ESR ceramic capacitors, reducing the amount of board space necessary for power applications, critical in handheld wireless devices.
The RT9053A consumes typically 0.7μA in shutdown mode. The other features include low dropout voltage, high output accuracy, and current limiting protection. The RT9053A is available in SOT-23-5 and WDFN-6L 2x2 packages.


  • 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
Key Spec.
Status Active
Vin (min) (V) 2.2
Vin (max) (V) 5.5
Vout (min) (V) 0.8
Vout (max) (V) 5.15
Output Adj. Method Resistor
Accuracy (+/- %) 1
Iout (max) (mA) 400
Iq (typ) (uA) 35
Vdropout @ rated current (typ) (mV) 230 @ 0.4A
Cout Type Ceramic
Features Enable Input;Low Dropout;OCP;Stable with Ceramic Capacitor
Package Type SOT-25;WDFN2x2-6
  • Adjustable Output Voltage Down to 0.8V
  • Wide Operating Voltage Ranges : 2.2V to 5.5V
  • Low Dropout : 230mV at 400mA
  • Ultra Fast Response in Line/Load Transient
  • Current Limiting Protection
  • Thermal Shutdown Protection
  • Output Only 1μF Capacitor Required for Stability
  • RoHS Compliant and Halogen Free
TitleLast UpdateShareDownload
Low Dropout, 400mA Adjustable Linear Regulator2011/07/18
Title Last Update ShareDownload
Low Dropout, 400mA Adjustable Linear Regulator 2015/05/19
Additional Documents
Title Last Update ShareDownload
Power Management Introduction and Selection Guide 2020/12/07
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RT9053AZQWWDFN2x2-62500 Not available Buy from Distributor