RT9229
DS9229-03 July 2001
www.richtek-ic.com.tw
1
Advanced Dual PWM and Dual Linear Power Controller
General Description
The RT9229 is a 4-in-one power controller optimized
for high-performance microprocessor and computer
applications. The IC integrates two PWM controllers,
a linear regulator and a linear controller 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 3.3V power with a standard buck
converter. The linear regulator provides power for the
clock driver circuit and the linear controller regulates
power for the GTL bus.
The RT9229 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 second PWM controller
is user-adjustable for output level between 3.0V and
3.5V with
±2.5% accuracy. The 5-bit DAC has a
typical
±1% tolerance. The linear regulator uses an
internal drive device to provide 2.5V
±2.5% output
voltage. The linear controller drives an external N-
channel MOSFET or a low cost NPN bipolar
transistor to provide 1.5V
±2.5%.
The RT9229 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 upper MOSFET’s RDS(ON) which
eliminates the need for a current sensing resistor.
Ordering Information
RT9229
Features
4-in-one Regulated Voltages for Microprocessor
Core, I/O, Clock, and GTL
Compatible with HIP6019B
Power-Good Output Voltage Monitor
Switching section
5-bit DAC Programmable from 1.3V to 3.5V
±±±±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 RDS(ON)
Over-voltage Protection Uses Lower MOSFET
Linear Section
User-adjustable 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
Pin Configurations
RT9229CS
(Plastic SOP-28)
TOP VIEW
Operating temperature range
C: Commercial standard
Package type
S : SOP-28
1
2
3
4
5
6
7
8
9
10
11
12
17
18
19
20
21
22
23
24
25
26
27
28
13
14
16
15
PHASE2
VID4
VID3
VID2
VID1
VID0
PGOOD
OCSET2
FB2
UGATE2
SS
NC2
FAULT
FB4
LGATE1
VCC
UGATE1
PHASE1
PGND
OCSET1
VSEN1
FB1
FB3
GATE3
GND
NC1
VOUT4
VSEN2
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