3.5A, 1.2MHz, Synchronous Step-Down Converter


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The RT8086B is a high efficiency, synchronous step-down DC-DC converter. The available input voltage range is from 2.8V to 5.5V and the regulated output voltage is adjustable from 0.6V to 3.3V while delivering up to 3.5A of output current.

The internal synchronous low on-resistance power switches increase efficiency and eliminate the need for an external Schottky diode.

The current mode constant on-time operation with internal compensation allows the transient response to be optimized over a wide range of loads and output capacitors. TheRT8086B is available in the UQFN-12L 2x2 (FC) package.


Key Spec.
Status Active
Vin (min) (V) 2.8
Vin (max) (V) 5.5
Number of Outputs 1
Vout (min) (V) 0.6
Vout (max) (V) 3.3
Output Adj. Method Resistor
Iout (max) (A) 3.5
Current Limit (typ) (A) 6.68
Freq (typ) (kHz) 1200
Ext Sync No
Ron_HS (typ) (mOhm) 50
Ron_LS (typ) (mOhm) 40
Iq (typ) (mA) 0.06
Features Cycle-by-Cycle Current Limit;Enable Input;Internal Compensation;OCP;PSM;Power Good;UVP
Package Type UQFN2x2-12(FC)
  • High Efficiency Up to 95%
  • Low RDS(ON) Switches : 50mΩ/40mΩ
  • 0.6V Reference Allows for Low Output Voltage
  • Internal Compensation
  • Input Voltage Range : 2.8V to 5.5V
  • Adjustable Output Voltage from 0.6V to 3.3V
  • 1.2MHz Switching Frequency
  • Start-Up into Pre-Biased Load
  • Built in Soft-Start
  • Power Good Indication
  • Cycle-by-Cycle Current Limit
  • Input Under Voltage Lockout
  • Output Under Voltage Protection (Hiccup)
  • Thermal Shutdown Protection
  • RoHS Compliant and Halogen Free
TitleLast UpdateShareDownload
3.5A, 1.2MHz, Synchronous Step-Down Converter2013/06/20
Technical Documents
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Richtek Wide Input Voltage Range DC/DC Power Solutions for Industrial, Automotive and LED lighting applications2020/12/30
Richtek Selection Guide [Oct., 2020]2020/12/30
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How to estimate control loop bandwidth from the transient response time?2017/03/30 1359
Evaluation Boards
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3.5A, 1.2MHz, Synchronous Step-Down Converter2021/01/21
Reference Design
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Richtek Load Transient Tool2021/01/21
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RT8086BGQUFUQFN2x2-12(FC)2500 Request Buy from Distributor