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RT9244 Datasheet(PDF) 1 Page - Richtek Technology Corporation

Part No. RT9244
Description  Multi-Phase PWM Controller for CPU Core Power Supply
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Maker  RICHTEK [Richtek Technology Corporation]
Homepage  http://www.richtek.com
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RT9244 Datasheet(HTML) 1 Page - Richtek Technology Corporation

 
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RT9244
1
DS9244-06 March 2007
www.richtek.com
Multi-Phase PWM Controller for CPU Core Power Supply
Ordering Information
General Description
The RT9244 is a multi-phase buck DC/DC controller
integrated with all control functions for GHz CPU VRM.
The RT9244 controls 2, 3 or 4 buck switching stages
operating in interleaved phase set automatically. The multi-
phase architecture provides high output current while
maintaining low power dissipation on power devices and
low stress on input and output capacitors. The high
equivalent operating frequency also reduces the component
dimension and the output voltage ripple in load transient.
RT9244 controls both voltage and current loops to achieve
good regulation, response & power stage thermal balance.
Precise current loop using RDS(ON) as sense component
builds precise load line for strict VRM DC & transient
specification and also ensures thermal balance of different
power stages. The settings of current sense, droop tuning,
VCORE initial offset and over current protection are
independent to compensation circuit of voltage loop. The
feature greatly facilitates the flexibility of CPU power supply
design and tuning.
The DAC output of RT9244 supports K8 CPU by 5-bit VID
input, precise initial value & smooth VCORE transient at VID
jump. The IC monitors the VCORE voltage for PGOOD and
over-voltage protection. Soft-start, over-current protection
and programmable under-voltage lockout are also provided
to assure the safety of microprocessor and power system.
Features
Multi-Phase Power Conversion with Automatic
Phase Selection
K8 DAC Output with Active Droop Compens-ation
for Fast Load Transient
Smooth VCORE Transition at VID Jump
Power Stage Thermal Balance by RDS(ON) Current
Sense
Hiccup Mode Over-Current Protection
Programmable Switching Frequency (50kHz to
400kHz per Phase), Under-Voltage Lockout and
Soft-Start
High Ripple Frequency Times Channel Number
RoHS Compliant and 100% Lead (Pb)-Free
Applications
AMD® AthlonTM 64 and OpteronTM Processors Voltage
Regulator
Low Output Voltage, High Current DC-DC Converters
Voltage Regulator Modules
Pin Configurations
(TOP VIEW)
SOP-32
6
7
8
21
22
23
9
10
11
18
19
20
12
13
14
16
15
17
4
5
24
25
26
2
3
27
28
29
30
31
32
SS
OVP
VID3
VID2
ISP4
PWM4
PGOOD
DVD
VID1
VID0
PWM1
ISP1
RT
PWM2
COMP
FB
ISP2
GND
ADJ
VDIF
PWM3
ISP3
VSEN
SGND
SS2
VCC
ISN4
VID4
ISN3
ISN1
ISN2
VOSS
Note :
RichTek Pb-free and Green 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.
100%matte tin (Sn) plating.
RT9244
Package Type
S : SOP-32
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
cial Standard)


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