RT8841 Datasheet, PDF (1/32 Pages) Richtek Technology Corporation – 4/3/2/1-Phase PWM Controller for High-Density Power Supply

RT8841
4/3/2/1-Phase PWM Controller for High-Density Power Supply
General Description
The RT8841 is a 4/3/2/1-phase synchronous buck
controller with 2 integrated MOSFET drivers for VR11 CPU
power application. RT8841 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 applications. RT8841 comes to a small footprint
with WQFN-40L 6x6 package
Applications
z Desktop CPU Core Power
z Low Voltage, High Current DC/ DC Converter
Ordering Information
RT8841
Package Type
QW : WQFN-40L 6x6 (W-Type)
Note :
Lead Plating System
P : Pb Free
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.
Features
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 Tables for Intel VRD11/VRD10.x and AMD K8,
K8_M2 CPUs
z Continuous Differential Inductor DCR Current Sense
z Adjustable Soft Start
z Adjustable Frequency
z Power Good Indication
z Adjustable Over Current Protection
z Over Voltage Protection
z Small 40-Lead WQFN Package
z RoHS Compliant and 100% Lead(Pb)-Free
Pin Configurations
(TOP VIEW)
40 39 38 37 36 35 34 33 32 31
VIDSEL 1
FBRTN 2
SS/EN 3
ADJ ⁴
COMP 5
FB 6
OFS 7
RT 8
IMAX ⁹
GND 10
30 BOOT1
29 UGATE1
28 PHASE1
27 _LGATE1
GND
26 VCC12
25 LGATE2
24 PHASE2
23 UGATE2
41
22 BOOT2
21 PWM3
11 12 13 14 15 16 17 18 19 20
WQFN-40L 6x6
DS8841-01 April 2011
www.richtek.com
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