RT9230
1.5V Advanced Dual PWM and Dual Linear Power Controller
General Description
The RT9230 is a 4-in-one power controller optimized
for high-performance microprocessor and computer
applications. The IC integrates two PWM controller,
two linear controllers as well as monitoring and
protection functions into a 28-pin SOP package. The
first PWM controller regulates the microprocessor
core voltage with a synchronous buck converter,
while the second PWM controller supplies the
computer system鈥檚 AGP 1.5V or 3.3V bus power with
a standard buck converter. The first linear regulator
provides power for the 1.5V GTL bus and the second
linear
regulator
provides
1.8V
power
for
the
North/South Bridge core voltage and/or cache
memory circuits.
The RT9230 features an Intel-compatible, TTL 5-bit
programmable DAC that adjusts the core voltage
from 2.1V to 3.5V in 0.1V increments and from 1.3V
to 2.05V in 0.05V steps. The 5-bit DAC has a typical
鹵1%
tolerance. The second PWM controller is user-
selectable for output level of 1.5V and 3.3V with
鹵2.5%
accuracy.
The
linear
controllers
drives
external N-MOSFET or NPN bipolar for the pass
transistor to provide fixed output voltages of 1.5V
鹵3%
and 1.8V
鹵3%.
The RT9230 monitors all the output voltages. A
Power -good signal is issued when the core voltage
is within
鹵10%
of the DAC setting and the other
levels
are
above
their
under-voltage
levels.
Additional build-in over-voltage protection for the
core output uses the lower MOSFET to prevent
output voltage above 115% of the DAC setting. The
PWM over-current function monitors the output
current using the voltage drop across the MOSFET鈥檚
R
DS(ON)
, which eliminates the need for a current
sensing resistor.
Features
4-in-one Regulated Voltages for Microprocessor
Core, AGP Bus, North/South Bridge and/or
Cache Memory, GTL Bus Power
Compatible with HIP6020
Power-good Output Voltage Monitor
Switching section
5-bit DAC Programmable from 1.3V to 3.5V
鹵
1% DAC Accuracy
Fast Transient Response
Full 0% to 100% Duty Cycle Driver
Fixed 200kHz Switching Frequency
Adaptive Non-overlapping Gate Driver
Over-current Monitor Uses MOSFET R
DS(ON)
Over-voltage Protection Uses Lower MOSFET
Linear Section
Fixed Linear Regulator Output Voltage
MOSFET or NPN Driving Capability
Ultra Fast Response Speed
Under-voltage Protection
Internal Thermal Shutdown
Applications
Full Motherboard Power Regulation for Computer
Low-voltage Distributed Power Supplies
Pin Configurations
Part Number
RT9230CS
(Plastic SOP-28)
UGATE2
PHASE2
VID4
VID3
VID2
VID1
VID0
PGOOD
OCSET2
VSEN2
SELECT
SS
FAULT
VSEN4
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Pin Configurations
TOP VIEW
28
27
26
25
24
23
22
21
20
19
18
VCC
UGATE1
PHASE1
LGATE1
PGND
OCSET1
VSEN1
FB1
NC
Ordering Information
RT9230
Package type
S : SOP-28
Operating temperature range
C: Commercial standard
DS9230-03 July 2001
VSEN3
DRIVE3
17
GND
16
VAUX
15
DRIVE4
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