The RT8120E/F is a single-phase synchronous buck PWM DC-DC controller designed to drive two N-MOSFET. It provides a highly accurate, programmable output voltage precisely regulated to low voltage requirements with an internal 0.8V ±1% ( option for 0.6V ±1.5%) reference. The RT8120E/F uses a single feedback loop voltage mode PWM control for fast transient response. An oscillator with fixed frequency 300kHz reduces the external inductor and capacitor component size for saving PCB board area. The RT8120E/F provides fast transient response to satisfy high current output applications while minimizing external components. It is suitable for high performance graphic processors, DDR and VTT power. The RT8120E/F incorporates an externally compensated error amplifier and an internal soft-start and output enable. The RT8120E/F comes in SOP-8 and SOP-8 (Exposed Pad) packages.


  • System (Graphic, MB) with 5V or 12V Power
  • Graphic Cards (AGP 8X, 4X, PCI Express*16)
  • 3.3V to 12V Input DC-DC Regulators
  • Low Voltage Distributed Power Supplies
Key Spec.
RT8120E RT8120F
Status Active Active
Vs (typ) (V) 12;5 12;5
Vin (min) (V) 3 3
Vin (max) (V) 13.2 13.2
Vout (min) (V) 0.6 0.6
Vout (max) (V) 5 5
Output Adj. Method Resistor Resistor
Accuracy (+/- %) 1 1
Freq (typ) (kHz) 300 300
Iq (typ) (mA) 1.5 1.5
Ext Sync No No
Features Built-in Bootstrap Switch;Force PWM;OCP;OVP;SCP;UVP;Voltage Mode Control Built-in Bootstrap Switch;Force PWM;OCP;OVP;SCP;UVP;Voltage Mode Control
Package Type PSOP-8;SOP-8 PSOP-8;SOP-8
  • Wide Input Voltage Range : 3V to 13.2V
  • Embedded Switching Boot Diode
  • 0.8V ±1%, 0.6V ±1.5% Internal Reference
  • Shoot-Through Protection and Short Pulse Free Technology for Gate Drivers
  • Fixed Frequency 300kHz
  • Internal Soft-Start
  • Over Current Protection by Sensing MOSFET RDS(ON)
  • Enable/Shutdown Control
  • Drives Two N-MOSFETs
  • Full Duty Cycle : 0% to 85%
  • Fast Transient Response
  • Voltage Mode PWM Control with External Feedback Loop Compensation
  • Pinless LGATE Over Current Setting (LGOCS)
  • Over Voltage Protection
  • Under Voltage Protection
  • SOP-8 and SOP-8 (Exposed Pad) Packages
  • RoHS Compliant and Halogen Free
TitleLast UpdateDownload
Single-Phase Synchronous Buck PWM Controller2013/03/18