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RT9241B Datasheet

  • RT9241B

  • 18頁

  • ETC

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RT9241A/B
Two-Phase DC/DC Controller for CPU Core Power Supply
General Description
The RT9241A/B is a two-phase buck DC/DC
controller integrated with all control functions for high
performance processor VRM. The RT9241A/B
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.
RT9241A/B 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 RT9241A/B 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
Times Channel Number)
100KHz Version (RT9241B) for Lower Switching
Loss
Applications
Power Supply for Server and Workstation
Power Supply for High Current Microprocessor
Pin Configurations
Part Number
RT9241A/B CS
(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
RT9241A/B
Package type
S : SOP-20
Operating temperature range
C: Commercial standard
Operating frequency version
A : 200KHz
B : 100KHz
DS9241AB-01
October 2002
www.richtek.com
1

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