Synchronous Rectified Buck MOSFET Drivers


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The RT9611A/B is a high frequency, synchronous rectified, single phase dual MOSFET driver designed to adapt from normal MOSFET driving applications to high performance CPU VR driving capabilities.
The RT9611A/B can be utilized under both VCC = 5V or VCC  = 12V applications. The RT9611A/B also builds in an internal power switch to replace external boot strap diode. The RT9611A/B can support switching frequency efficiently up to 500kHz. The RT9611A/B has the UGATE driving circuit and the LGATE driving circuit for synchronous rectified DC/DC converter applications. The driving rise/fall time capability is designed within 30ns and the shoot through protection mechanism is designed to prevent shoot through of high side and low side power MOSFETs. The RT9611A/B has PWM tri-state shut down and OD input shut down functions which can force driver output into high impedance.
The difference of the RT9611A and the RT9611B is the propagation delay, tUGATEpdh. The RT9611B has comparatively large tUGATEpdh than RT9611B. Hence, the RT9611A is usually recommended to be utilized in performance oriented applications, such as high power density CPU VR or GPU VR.
The RT9611A/B comes in a small footprint with 8-pin packages. The choice of packages type includes SOP-8, SOP-8 (Exposed Pad) and WDFN-8EL 3x3.


  • Core Voltage Supplies for Desktop, Motherboard CPU
  • High Frequency Low Profile DC/DC Converters
  • High Current Low Voltage DC/DC Converters
  • Motherboards
Key Spec.
RT9611A RT9611B
Status Active Active
Number of Channels 1 1
Vcc (typ) (V) 12 12
UGATE Rise Time (typ) (ns) 25 25
UGATE Fall Time (typ) (ns) 12 12
LGATE Rise Time (typ) (ns) 24 24
LGATE Fall Time (typ) (ns) 10 10
UGATE Sink Resistance (typ) (Ohm) 1.4 1.4
LGATE Sink Resistance (typ) (Ohm) 1.1 1.1
Disable Pin Yes Yes
Built-In Bootstrap Diode Yes Yes
Iq (typ) (mA) 1.2 1.2
Features Tri-State Input Tri-State Input
Package Type WDFN3x3-8E WDFN3x3-8E
  • Drive Two N-MOSFETs
  • Adaptive Shoot Through Protection
  • Embedded Bootstrap Diode
  • Support High Switching Frequency
  • Fast Output Rise Time
  • Tri-State Input for Bridge Shutdown
  • Disable Control Input
  • Small SOP-8, SOP-8 (Exposed Pad) and 8-Lead WDFN Packages
  • RoHS Compliant and Halogen Free
TitleLast UpdateShareDownload
Synchronous Rectified Buck MOSFET Drivers2010/07/13
Title Last Update ShareDownload
Synchronous Rectified Buck MOSFET Drivers 2015/05/19