3A, 2MHz, Synchronous Step-Down Converter


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The RT8055 is a high efficiency synchronous, step-down DC/DC converter. Its input voltage range is from 2.6V to 5.5V and provides an adjustable regulated output voltage from 0.8V to 5V while delivering up to 3A of output current.
The internal synchronous low on-resistance power switches increase efficiency and eliminate the need for an external Schottky diode. The switching frequency is set by an external resistor. The 100% duty cycle provides low dropout operation extending battery life in portable systems. Current mode operation with external compensation allows the transient response to be optimized over a wide range of loads and output capacitors.
The RT8055 is operated in forced continuous PWM Mode which minimizes ripple voltage and reduces the noise and RF interference.
The RT8055 is available in the WDFN-10L 3x3 and SOP-8 (Exposed Pad) packages.


  • Portable Instruments
  • Battery-Powered Equipment
  • Notebook Computers
  • Distributed Power Systems
  • IP Phones
  • Digital Cameras
  • 3G/3.5G Data Card
  • LCD TV
Key Spec.
Status Active
Vin (min) (V) 2.6
Vin (max) (V) 5.5
Number of Outputs 1
Vout (min) (V) 0.8
Vout (max) (V) 5
Output Adj. Method Resistor
Iout (max) (A) 3
Current Limit (typ) (A) 4
Freq (typ) (kHz) 1800
Freq (min) (kHz) 300
Freq (max) (kHz) 2000
Ext Sync No
Ron_HS (typ) (mOhm) 100
Ron_LS (typ) (mOhm) 100
Iq (typ) (mA) 0.5
Features 100% Duty Cycle;Adjustable Frequency;Current Mode Control;Force PWM;OCP;Stable with Ceramic Capacitor;UVP
Package Type PSOP-8;WDFN3x3-10
  • High Efficiency : Up to 95%
  • Low RDS(ON) Internal Switches : 100mΩ
  • Programmable Frequency : 300kHz to 2MHz
  • No Schottky Diode Required
  • 0.8V Reference Voltage Allows for Low Output Voltage
  • Forced Continuous Mode Operation
  • 100% Duty Cycle Operation
  • Input Over Voltage Protection
  • RoHS Compliant and Halogen Free
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3A, 2MHz, Synchronous Step-Down Converter2010/08/03
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3A, 2MHz, Synchronous Step-Down Converter 2015/05/19
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Reference Design
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Richtek Load Transient Tool2021/01/21
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RT8055GQWWDFN3x3-101500 Not available Buy from Distributor