RT8867A

Advanced 4/3-Phase PWM Controller for CPU Core Power

The RT8867A is an advanced 4/3-phase synchronous buck controller with 3 integrated MOSFET drivers. It integrates an 8-bit DAC that supports Intel VR11.x CPUs power application.

The IC adopts state-of-the-art dynamic phase control capability by PS1/2/3 pins and achieves high efficiency over a wide load range. It uses lossless R_DS(ON) current sensing to achieve phase current balance. Other features include adjustable operating frequency, adjustable soft-start, short circuit protection, adjustable over current protection, over voltage protection, under voltage protection, power good indication, VR_HOT indication and VR_SHDN indication.

The RT8867A is available in a small footprint with WQFN-48L 6x6 package.

Applications

Desktop CPU Core Power
Middle/High End Graphic Cards
Low Voltage, High Current DC/ DC Converters

Key Spec.
	RT8867A
Status	Active
VID Table Support	VR11.0;VR11.1
Number of Phases	4
Vcc (typ) (V)	12
Vin (min) (V)	10.8
Vin (max) (V)	13.2
Accuracy (Vout>=1V) (+/- %)	0.5
Freq (typ) (kHz)	300
Built-in DAC Generator	Yes
Number of MOSFET Drivers	3
Features	Adjustable Frequency;Adjustable Soft-Start;Built-in Bootstrap Switch;DCR Current Sense;Droop Control;Enable Input;OCP;OVP;Power Good;SCP;UVP;Voltage Mode Control
Package Type	WQFN6x6-48

Features

12V Power Supply Voltage
4/3-Phase Power Conversion
Integrated 3 MOSFET Drivers with Internal Bootstrap Diode
Dynamic Phase Control Capability
8-bit DAC Supports Intel VR11.x CPUs
Lossless R_DS(ON) Current Sensing for Current Balance
Adjustable Frequency : 50kHz to 1MHz
Adjustable Over Current Protection
Adjustable Soft-Start
VR_RDY, VR_HOT and VR_SHDN Indications
Small 48-Lead WQFN Package
RoHS Compliant and Halogen Free

Datasheet
Title	Last Update	Download
Advanced 4/3-Phase PWM Controller for CPU Core Power	2015/04/29

Please confirm with our distributor or sales representative for actual stock status.