2.7MHz 3A Step-Down Converter with I2C Interface


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The RT8088A is a full featured 5.5V, 3A, Constant-On-Time (COT) synchronous step-down converter with two integrated MOSFETs. The current mode COT operation with internal compensation allows the transient response to be optimized over a wide range of loads and output capacitors to efficiently reduce external component count.
The RT8088A provides up to 2.7MHz switching frequency to minimize the size of output inductor and capacitors.
The output voltage is programmed through an I2C interface capable of operating up to 400kHz.

The RT8088A is available in the WL-CSP-15B 1.31x2.11 (BSC) package.


  • Distributed Power Systems
  • Enterprise Servers, Ethernet Switches & Routers, and Global Storage Equipment
  • Telecom & Industrial Equipment
Key Spec.
Status Active
Vin (min) (V) 2.5
Vin (max) (V) 5.5
Number of Outputs 1
Vout (min) (V) 0.6
Vout (max) (V) 1.4
Output Adj. Method Digital
Iout (max) (A) 3
Current Limit (typ) (A) 3.9
Freq (typ) (kHz) 2700
Ext Sync No
Ron_HS (typ) (mOhm) 48
Ron_LS (typ) (mOhm) 22
Iq (typ) (mA) 0.075
Interface I2C
Features Adjustable Current Limit;COT Control;Cycle-by-Cycle Current Limit;Fast Transient Response;Internal Compensation;OTP;Selectable (PSM or PWM);Stable with Ceramic Capacitor;UVP
Package Type WL-CSP1.31x2.11-15
  • 2.5V to 5.5V Input Voltage Range
  • Current Mode COT Control Loop Design
  • Fast Transient Response
  • Internal 48mΩ and 22mΩ Synchronous Rectifier
  • I2C compatible interface up to 400kHz
  • Highly Accurate VOUT Regulation Over Load/Line Range
  • Robust Loop Stability with Low-ESR COUT
  • RoHS Compliant and Halogen Free
TitleLast UpdateShareDownload
2.7MHz 3A Step-Down Converter with I2C Interface2013/09/09
Technical Documents
TitleLast UpdateShareDownload
Richtek Selection Guide (Oct., 2021)2021/11/02
TitleLast UpdateShareViews
How to estimate control loop bandwidth from the transient response time?2017/03/30 1397
Reference Design
TitleLast UpdateShareDownload
Richtek Load Transient Tool2021/01/21
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RT8088AWSCWL-CSP1.31x2.11-153000 Request Buy from Distributor