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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.

Applications

  • Cellular Handsets
  • Battery Powered Equipment
  • Hand-Held Instruments
  • Portable Information Appliances
Key Spec.
RT9055
Status Last Time Buy 
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
Features
  • 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
Datasheet
TitleVersionLast UpdateDownload
RT9055: 300mA Dual LDO RegulatorV2.02014/08/25
Additional Documents
Title Last Update ShareDownload
Power Management Components for Lithium-Ion Battery Powered Applications
鋰離子電池電源管理IC選擇指南 		2020/12/07
Evaluation Boards
TitleLast UpdateDownload
300mA Dual LDO Regulator2021/01/21
Part NumberPackage TypePackage Qty.Free SampleDistributorStockBuy From Authorized Distributor
RT9055-CCWSCWL-CSP0.8x1.2-63,000 Request Digikey 2,886 Buy
Mouser 0 Lead-Time: 14 weeks
RT9055-CFWSCWL-CSP0.8x1.2-63,000 Request Digikey 2,915 Buy
Mouser 2,940 Buy
RT9055-GGWSCWL-CSP0.8x1.2-63,000 Request Digikey 1,485 Buy
Mouser 2,980 Buy
RT9055-JJWSCWL-CSP0.8x1.2-63,000 Request Digikey 2,953 Buy
Mouser 0 Lead-Time: 14 weeks
RT9055-NNWSCWL-CSP0.8x1.2-63,000 Request Digikey 2,889 Buy
Mouser 0 Lead-Time: 14 weeks
RT9055-SSWSCWL-CSP0.8x1.2-63,000 Request Digikey 2,869 Buy
Mouser 0 Lead-Time: 14 weeks
Evaluation Board
Part NumberDistributorStockBuy From Authorized Distributor
EVB_RT9055-NGWSC Digikey 5 Buy
Mouser 0 Lead-Time: 14 weeks
Please confirm with our distributor or sales representative for actual stock status.
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