5A, 18V, 500kHz, ACOTTM Step-Down Converter


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The RT6255A/B is a high-performance, synchronous step-down DC-DC converter that can deliver up to 5A output current from a 4.5V to 18V input supply. The device integrates low RDS(ON) power MOSFETs, accurate 0.6V reference and an integrated diode of bootstrap circuit to offer a very compact solution.

The RT6255A/B adopts Advanced Constant On-Time (ACOT®) control architecture that provides ultrafast transient response and further reduces the external-component count. In steady states, the ACOT® operates in nearly constant switching frequency over line, load and output voltage ranges and makes the EMI filter design easier.

The device offers Independent enable control input pin and power good indicator (TSOT23-8 only) for easily sequence control. To control the inrush current during the startup, the device provides a fixed 1.5ms soft-start up. Fully protection features are also integrated in the device including the cycle-by-cycle current limit control, UVP, input UVLO and OTP.

The RT6255A/B is available in the TSOT-23-6 (FC) and TSOT-23-8 (FC) package.


  • Set Top Box
  • Portable TV
  • Access Point Router
  • DSL Modem
  • LCD TV
TitleLast UpdateShareDownload
5A, 18V, 500kHz, ACOTTM Step-Down Converter2016/08/30
Technical Documents
TitleLast UpdateShareDownload
Richtek Selection Guide (Oct., 2021)2021/11/23
TitleLast UpdateShareViews
How to estimate control loop bandwidth from the transient response time?2017/03/30 1426
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RT6255AHGJ6FTSOT-26(FC)3000 Not available Buy from Distributor
RT6255AHGJ8FTSOT-28(FC)3000 Not available Buy from Distributor
RT6255BHGJ6FTSOT-26(FC)3000 Request Buy from Distributor
RT6255BHGJ8FTSOT-28(FC)3000 Request Buy from Distributor