2.5A, Ultra-Low Dropout, Ultra-Fast CMOS LDO Regulator


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The RT9009 is a high performance, 2.5A LDO regulator, offering extremely high PSRR and ultra-low dropout. Ideal for portable RF and wireless applications with demanding performance and space requirements.
Regulator ground current increases only slightly in dropout, further prolonging the battery life. The RT9009 also works with low-ESR ceramic capacitors, reducing the amount of board space necessary for power applications that is critical in hand-held wireless devices.
The RT9009 consumes less than 1μA in shutdown mode and has fast turn-on time of less than 400μs. The other features include ultra-low dropout voltage, high output accuracy, current limiting protection, and high ripple rejection ratio. The RT9009 is available in the TO-263S-5 package.


  • Game Console
  • CDMA/GSM Cellular Handsets
  • Battery-Powered Equipment
  • Laptop, Palmtops, Notebook Computers
  • Hand-Held Instruments
  • Mini PCI & PCI-Express Cards
  • PCMCIA & New Cards
  • Portable Information Appliances
Key Spec.
Status Active
Vin (min) (V) 2.5
Vin (max) (V) 5.5
Vout (min) (V) 1.25
Vout (max) (V) 4.5
Output Adj. Method Resistor
Accuracy (+/- %) 2
Iout (max) (mA) 2500
Iq (typ) (uA) 380
Vdropout @ rated current (typ) (mV) 520 @ 2A
Cout Type Ceramic
Features Enable Input;OCP;Stable with Ceramic Capacitor
Package Type TO-263S-5
  • Ultra Fast Response in Line/Load Transient
  • < 1μA Shutdown Current
  • Low Dropout : 520mV at 2A
  • Wide Operating Voltage Ranges : 2.5V to 5.5V
  • TTL-Logic-Controlled Shutdown Input
  • Current Limiting Protection
  • Thermal Shutdown Protection
  • Low-ESR Ceramic Output Capacitor Required for Stability
  • High Power Supply Rejection Ratio
  • RoHS Compliant and 100% Lead (Pb)-Free
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2.5A, Ultra-Low Dropout, Ultra-Fast CMOS LDO Regulator2009/07/28
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2.5A, Ultra-Low Dropout, Ultra-Fast CMOS LDO Regulator 2015/05/19