300mA Dual LDO Regulator


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The RT9055 is a dual channel, low noise, and low dropout regulator sourcing up to 300mA at each channel. The output voltage range is from 0.9V to 3.5V with an input voltage range from 1.5V to 5.5V.
The RT9055 offers 2% accuracy, extremely low dropout voltage and extremely low quiescent current (only 29μA per LDO). The shutdown current is near zero which is suitable for battery powered applications. The RT9055 also provides protection functions such as current limiting, output short circuit protection, and over temperature protection.
The RT9055 allows stable operation with very small ceramic output capacitors, hence minimizing required board space and component cost.
The RT9055 is available in a WL-CSP-6B 0.8x1.2 package.


  • Cellular Handsets
  • Battery Powered Equipment
  • Hand-Held Instruments
  • Portable Information Appliances
Key Spec.
Status Active
Vin (min) (V) 1.5
Vin (max) (V) 5.5
Number of Outputs 2
Vout (min) (V) 1
Vout (max) (V) 3.5
Fixed Vout Option (V) 1;1.1;1.2;1.25;1.3;1.4;1.5;1.6;1.8;1.85;1.9;2.0;2.1;2.5;2.6;2.65;2.7;2.8;2.85;2.9;3.0;3.1;3.15;3.2;3.3;3.5
Output Adj. Method Fixed
Accuracy (+/- %) 2
Iout (max) (A) 0.3
Iq (typ) (mA) 58
Current Limit (typ) (mA) 600
Vdropout@ rated current (typ) (mV) 240 @ 0.3A
Cout (min) (uF) 1
Cout Type Ceramic
Features Enable Input;OCP;SCP
Package Type WL-CSP0.8x1.2-6
  • Wide Operating Voltage Range : 1.5V to 5.5V
  • Low Noise for RF Application
  • No Noise Bypass Capacitor Required
  • Fast Response in Line/Load Transient
  • TTL Logic Controlled Shutdown Input
  • Low Temperature Coefficient
  • Dual LDO Outputs (300mA/300mA)
  • Ultra-Low Quiescent Current : 29μA/LDO
  • High Output Accuracy 2%
  • Short Current Protection
  • Thermal Shutdown Protection
  • Current Limit Protection
  • Short Circuit Thermal Folded Back Protection
  • RoHS Compliant and Halogen Free
TitleLast UpdateShareDownload
300mA Dual LDO Regulator2015/04/29
Title Last Update ShareDownload
300mA Dual LDO Regulator 2015/05/19
Technical Documents
TitleLast UpdateShareDownload
Power IC Solutions for IoT/Portable/Wearable/Battery-Powered Applications2021/10/28
Power Mangement Components for Lithium-Ion Battery Powered Applications2020/12/30
Additional Documents
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Power Management Components for Lithium-Ion Battery Powered Applications
Evaluation Boards
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300mA Dual LDO Regulator2021/01/21
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RT9055-CCWSCWL-CSP0.8x1.2-63000 Not available Buy from Distributor
RT9055-CFWSCWL-CSP0.8x1.2-63000 Not available Buy from Distributor
RT9055-GGWSCWL-CSP0.8x1.2-63000 Not available Buy from Distributor
RT9055-GSWSCWL-CSP0.8x1.2-63000 Not available Buy from Distributor
RT9055-JJWSCWL-CSP0.8x1.2-63000 Not available Buy from Distributor
RT9055-NNWSCWL-CSP0.8x1.2-63000 Not available Buy from Distributor
RT9055-SSWSCWL-CSP0.8x1.2-63000 Not available Buy from Distributor