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The RT8105 is a high efficiency synchronous buck PWM controllers that generate logic-supply voltages in PC based systems. These high performance , single output devices include internal soft-start, frequency compensation networks and integrates all of the control, output adjustment, monitoring and protection functions into a single package.
The device operating at fixed 300kHz frequency provides an optimum compromise between efficiency, external component size, and cost.
Adjustable over-current protection (OCP) monitors the voltage drop across the RDS(ON) of the lower MOSFET for synchronous buck PWM DC-DC controller. The over-current function cycles the soft-start in 4-times hiccup mode to provide fault protection, and in an always hiccup mode for under-voltage protection.

Applications

  • Graphic Card
  • Motherboard, Desktop Servers
  • IA Equipments
  • Telecomm Equipments
  • High Power DC-DC Regulators
Key Spec.
RT8105
Status NRND
Recommended Alternative  RT8120E/RT8120F
Vs (typ) (V) 12;5
Vin (min) (V) 3.3
Vin (max) (V) 12
Vout (min) (V) 0.8
Vout (max) (V) 5
Output Adj. Method Resistor
Accuracy (+/- %) 2
Freq (typ) (kHz) 300
Iq (typ) (mA) 6
Ext Sync No
Features Force PWM;OCP;OVP;SCP;UVP;Voltage Mode Control
Package Type SOP-8
Features
  • Operating with 5V or 12V Supply Voltage
  • Drives All Low Cost N-MOSFETs
  • Voltage Mode PWM Control
  • 300kHz Fixed Frequency Oscillator
  • Fast Transient Response :
      ♦ High-Speed GM Amplifier
      ♦ Full 0 to 100% Duty Ratio
  • Internal Soft-Start
  • Adaptive Non-Overlapping Gate Driver
  • Over-Current Fault Monitor on MOSFET, No Current Sense Resistor Required
  • Full-Time Over Voltage Protection
  • RoHS Compliant and Halogen Free
Please confirm with our distributor or sales representative for actual stock status.
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