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5V to 12V Single Synchronous Buck PWM Controller with Reference Input

RT8109

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The RT8109 is a single-phase synchronous buck PWM DC-DC controller designed to drive two N-MOSFETs. It provides a highly accurate, programmable output voltage precisely regulated to low voltage requirement with an internal 0.6V ±1% reference.
The RT8109 uses a single feedback loop voltage mode PWM control for fast transient response. The high driving capability makes it suitable for large output current applications. An oscillator with fixed frequency 300kHz reduces the component size of the external inductor and capacitor for saving PCB board area and cost.
The RT8109 supports both tracking and stand-alone loop control modes. Standalone mode is simple and tracking mode provides better flexibility. The RT8109 also integrates complete protection functions such as OCP, OVP, UVP into WDFN-10L 3x3 package.

Applications

  • Mother Boards and Desktop Servers
  • Graphic Cards
  • Switching Power Supply
  • Generic DC/DC Power Regulator
  • Motherboards
Key Spec.
RT8109
Status Active
Vs (typ) (V) 12
Vin (min) (V) 3.3
Vin (max) (V) 12
Vout (min) (V) 0.6
Vout (max) (V) 5
Output Adj. Method Resistor
Accuracy (+/- %) 1
Freq (typ) (kHz) 300
Freq (min) (kHz) 250
Freq (max) (kHz) 350
Iq (typ) (mA) 2.5
Ext Sync No
Features Built-in Bootstrap Switch;Force PWM;OCP;OVP;Power Good;SCP;UVP;Voltage Mode Control
Package Type WDFN3x3-10
Features
  • Single IC Supply Voltage ( 5V to 12V).
  • Drive Two N-MOSFETs
  • Fixed Operating Frequency at 300kHz
  • Voltage Mode PWM Control with External Feedback Loop Compensation
  • Over Current Protection by Sensing MOSFET RDS(ON)
  • Dual Mode Regulation Control
      ♦ Standalone Mode (FB regulating to close to internal reference 0.6V)
      ♦ Tracking Mode (FB following PI input)
  • Power Good Indication
  • On/Off Control
  • Full 0 to 90% Duty Cycle
  • RoHS Compliant and Halgen Free
Datasheet
TitleLast UpdateShareDownload
5V to 12V Single Synchronous Buck PWM Controller with Reference Input2008/12/23
Reliability
Title Last Update ShareDownload
5V to 12V Single Synchronous Buck PWM Controller with Reference Input 2015/05/19
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