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The RT8871A/B is a 4/3/2-phase synchronous buck controller with two integrated MOSFET drivers for CPU power application and a single-phase buck with integrated MOSFET driver for North-Bridge (NB) chipset. The RT8871A/B uses differential inductor DCR current sense to achieve phase current balance and active voltage positioning. Other features include adjustable operating frequency, power good indication, external error-amp compensation, over voltage protection, over current protection and enable/shutdown for various applications. The RT8871A/B comes in a small footprint with WQFN-48L 7x7 and WQFN-48L 6x6 packages.

Applications

  • Desktop CPU Core Power
  • Low Voltage, High Current DC/DC Converter
Key Spec.
RT8871A RT8871B
Status Active Active
VID Table Support AM2;AM2+;AM3;SVI AM2;AM2+;AM3;SVI
Number of Phases 1;4 1;4
Vcc (typ) (V) 12 12
Vin (min) (V) 10.8 10.8
Vin (max) (V) 13.2 13.2
Accuracy (Vout>=1V) (+/- %) 0.5 0.5
Freq (typ) (kHz) 300 300
Built-in DAC Generator Yes Yes
Number of MOSFET Drivers 1;2 1;2
Features Adjustable Frequency;Built-in Bootstrap Switch;DCR Current Sense;Diode Emulation Mode;Droop Control;Enable Input;Fast Transient Response;OCP;OVP;Power Good;SCP;UVP;Voltage Mode Control Adjustable Frequency;Built-in Bootstrap Switch;DCR Current Sense;Diode Emulation Mode;Droop Control;Enable Input;Fast Transient Response;OCP;OVP;Power Good;SCP;UVP;Voltage Mode Control
Package Type WQFN7x7-48 WQFN7x7-48
Features
  • 12V Power Supply Voltage
  • 4/3/2-Phase Power Conversion for VCORE Power
  • 3 Embedded MOSFET Drivers (2 for CPU and 1 for NB)
  • Internal Regulated 5V Output
  • Support AMD AM2 6-bit Parallel and AM2+ 7-bit Serial VID with Dual OCP
  • Support 3.4MHz High Speed I2C
  • Support Programmable Load Line for CORE and NB Sections
  • Continuous Differential Inductor DCR Current Sense
  • Adjustable Frequency (Typically at 300kHz)
  • Selectable 1 or 2 Phase in Power-Saving (PS) Mode
  • Phase-Interleaving for VCORE Controller
  • Power Good Indication
  • Adjustable Over Current Protection
  • Over Voltage Protection
  • Small 48-Lead WQFN Package
  • RoHS Compliant and Halogen Free
Please confirm with our distributor or sales representative for actual stock status.
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