RT9230 Datasheet, PDF (1/10 Pages) List of Unclassifed Manufacturers – 1.5V ADVANCED DUAL PWM AND DUAL LINEAR POWER CONTROLLER

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’s 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
±1% tolerance. The second PWM controller is user-
selectable for output level of 1.5V and 3.3V with
±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
±3% and 1.8V ±3%.
The RT9230 monitors all the output voltages. A
Power -good signal is issued when the core voltage
is within ±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’s
R_DS(ON), which eliminates the need for a current
sensing resistor.
Ordering Information
RT9230… …
Package type
S : SOP-28
Operating temperature range
C: Commercial standard
DS9230-03 July 2001
Features
z 4-in-one Regulated Voltages for Microprocessor
Core, AGP Bus, North/South Bridge and/or
Cache Memory, GTL Bus Power
z Compatible with HIP6020
z Power-good Output Voltage Monitor
Switching section
z 5-bit DAC Programmable from 1.3V to 3.5V
z ±1% DAC Accuracy
z Fast Transient Response
z Full 0% to 100% Duty Cycle Driver
z Fixed 200kHz Switching Frequency
z Adaptive Non-overlapping Gate Driver
z Over-current Monitor Uses MOSFET R_DS(ON)
z Over-voltage Protection Uses Lower MOSFET
Linear Section
z Fixed Linear Regulator Output Voltage
z MOSFET or NPN Driving Capability
z Ultra Fast Response Speed
z Under-voltage Protection
z Internal Thermal Shutdown
Applications
z Full Motherboard Power Regulation for Computer
z Low-voltage Distributed Power Supplies
Pin Configurations
Part Number
Pin Configurations
RT9230CS
(Plastic SOP-28)
TOP VIEW
UGATE2 ¹
PHASE2 2
28 VCC
27 UGATE1
VID4 ³
26 PHASE1
VID3 4
VID2 ⁵
25 _LGATE1
24 PGND
VID1 6
23 _OCSET1
VID0 7
22 VSEN1
PGOOD ⁸
21 _FB1
OCSET2 ⁹
20 _NC
VSEN2 ¹⁰
SELECT ¹¹
19 _VSEN3
18 _DRIVE3
SS ¹²
17 _GND
FAULT 13
16 _VAUX
VSEN4 14
15 _DRIVE4
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