RT8869A Datasheet, PDF (1/19 Pages) Richtek Technology Corporation – Advanced 2/1-Phase PWM Controller for CPU Core Power

RT8869A
Advanced 2/1-Phase PWM Controller for CPU Core Power
General Description
The RT8869A is an advanced 2/1-phase synchronous buck
controller with 2 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 pin 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 RT8869A is available in a small footprint with WQFN-
40L 5x5 package.
Ordering Information
RT8869A
Package Type
QW : WQFN-40L 5x5 (W-Type)
Lead Plating System
Z : ECO (Ecological Element with
Halogen Free and Pb free))
Note :
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.
Marking Information
RT8869A
ZQW
YMDNN
RT8869AZQW : Product Number
YMDNN : Date Code
Features
z 12V Power Supply Voltage
z 2/1-Phase Power Conversion
z Integrated 2 MOSFET Drivers with Internal
Bootstrap Diode
z Dynamic Phase Control Capability
z 8-bit DAC Supports Intel VR11.x CPUs
z Lossless R_DS(ON) Current Sensing for Current Balance
z Adjustable Frequency : 50kHz to 1MHz
z Adjustable Over Current Protection
z Adjustable Soft-Start
z VR_RDY, VR_HOT and VR_SHDN Indications
z Small 40-Lead WQFN Package
z RoHS Compliant and Halogen Free
Applications
z Desktop CPU Core Power
z Middle/High End Graphic Cards
z Low Voltage, High Current DC/ DC Converters
Pin Configurations
(TOP VIEW)
40 39 38 37 36 35 34 33 32 31
VRSEL 1
30
VR_RDY 2
29
SS 3
28
EN 4
27
DAC 5
GND
26
EAP 6
25
FB 7
24
COMP 8
CSP 9
41
23
22
CSN 10
21
11 12 13 14 15 16 17 18 19 20
UGATE1
PHASE1
LGATE1
VCC12A
VCC12B
LGATE2
PHASE2
UGATE2
BOOT2
VR_HOT
WQFN-40L 5x5
DS8869A-00 May 2011
www.richtek.com
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