RT8862 Datasheet, PDF (1/29 Pages) Richtek Technology Corporation – Advanced 4/3/2/1-Phase PWM Controller with Embedded Drivers for CPU Core Power Supply

RT8862
Advanced 4/3/2/1-Phase PWM Controller with Embedded
Drivers for CPU Core Power Supply
General Description
The RT8862 is an advanced 4/3/2/1-phase synchronous
buck controller with 2 integrated MOSFET drivers for Intel
VR11/VR10 and AMD K8/K8_M2 CPUs power application.
RT8862 adopts state-of-the-art dynamic phase control
capability. That achieves high efficiency over wide load
range. It uses differential inductor DCR current sense to
achieve phase current balance and active voltage
positioning. Other features include adjustable operating
frequency, adjustable soft start, power good indication,
external error-amp compensation, over voltage protection,
over current protection and enable/shutdown for various
application. RT8862 comes to a small footprint with
WQFN-48L 7x7 package.
Ordering Information
RT8862
Package Type
QW : WQFN-48L 7x7 (W-Type)
Note :
Lead Plating System
G : Green (Halogen Free and Pb Free)
Richtek products are :
` RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
` Suitable for use in SnPb or Pb-free soldering processes.
Applications
z Desktop CPU Core Power
z Low Voltage, High Current DC/ DC Converter
Features
z Support Dynamic Phase Control
z 12V Power Supply Voltage
z 4/3/2/1-Phase Power Conversion
z 2 Embedded MOSFET Drivers
z Internal Regulated 5V Output
z VID table for INTEL VR11.1/VR10.x and AMD K8/
K8_M2 CPUs
z Continuous Differential Inductor DCR Current Sense
z Adjustable Soft Start
z Adjustable Frequency (300kHz typ.)
z Power Good Indication
z Adjustable Over Current Protection
z Over Voltage Protection
z VRHOT Sensing with External Thermistor
z IMON Output Current Indication
z Power State Indicator (PSI)
z Small 48-Lead WQFN Package
z RoHS Compliant and Halogen Free
Pin Configurations
(TOP VIEW)
48 47 46 45 44 43 42 41 40 39 38 37
FBRTN 1
QR1 2
QR2 3
SS/EN 4
COMP 5
FB 6
OFS 7
RT 8
ADJ 9
IMAX 10
IMAXPSI 11
IMONFB 12
GND
36 PWRGD
35 BOOT1
34 UGATE1
33 PHASE1
32 LGATE1
31 VCC12
30 LGATE2
29 PHASE2
28 UGATE2
49
27 BOOT2
26 PWM3
25 PWM4
13 14 15 16 17 18 19 20 21 22 23 24
WQFN-48L 7x7
DS8862-01 April 2011
www.richtek.com
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