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RT9241 Datasheet

  • RT9241

  • Two-Phase DC/DC Controller for CPU Core Power Supply

  • 269.22KB

  • 13頁

  • ETC

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Preliminary
RT9241
Two-Phase DC/DC Controller for CPU Core Power Supply
General Description
The RT9241 is a two-phase buck DC/DC controller
integrated
with
all control functions
for
high
performance processor VRM. The RT9241 drives 2
buck switching stages operating in 180 degree
phase
shift. The two-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.
RT9241 regulates both easily set voltage and
current loops. Precise current sharing for power
stage is achieved by differential input current sense
and processing circuit. The settings of current
sense, droop tuning 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 RT9241 uses a 5-bit DAC of 1.1V to 1.85V
(25mV/step)
output
with
load
current
droop
compensation to meet the strict VRM transient
requirement. 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
Two-Phase Power Conversion
VRM 9.0 DAC Output with Active Droop
Compensation for Fast Load Transient
Precise
Channel
Current
Sharing
with
Differential Sense Input
Hiccup Mode Over Current Protection
Programmable Under Voltage Lockout and
Soft Start
High Ripple Frequency, (Channel Frequency
200KHz) Times Channel Number
Applications
Power Supply for Server and Workstation
Power Supply for High Current Microprocessor
Pin Configurations
Part Number
RT9241CS
(Plastic SOP-20)
VID4
VID3
VID2
VID1
VID0
COMP
FB
ADJ
DVD
SS
1
2
3
4
5
6
7
8
9
10
Pin Configurations
TOP VIEW
20
19
18
17
16
15
14
13
12
11
VDD
PGOOD
ISP1
PWM1
PWM2
ISP2
VSEN
GND
ISN1
ISN2
Ordering Information
RT9241
Package Type
S : SOP-20
Operating temperature range
C: Commercial standard
DS9241-00 November 2001
www.richtek-ic.com.tw
1

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