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RT9227A-CS Datasheet

  • RT9227A-CS

  • Advanced PWM and Dual Fixed Linear Power Controller

  • 10頁

  • ETC

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Preliminary
RT9227A
Advanced PWM and Dual Fixed Linear Power Controller
General Description
The RT9227A is a 3-in-one power controller
optimized for high-performance microprocessor and
computer
applications.
The
IC
integrates
a
synchronous buck PWM controller, a linear regulator
and a linear controller as well as monitoring and
protection functions into a 24-pin SOP package. The
PWM controller regulates the microprocessor core
voltage. The linear regulator provides power for the
clock driver circuit and the linear controller regulates
power for the GTL bus.
The RT9227A 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 linear regulator uses an internal
drive device to provide a fixed 2.5V
鹵2.5%
output
voltage. The linear controller drives an external N-
channel MOSFET or a low cost NPN bipolar
transistor to provide a fixed 1.5V
鹵2.5%.
The RT9227A 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 upper MOSFET鈥檚 R
DS(ON)
, which
eliminates the need for a current sensing resistor.
Features
3-in-one Regulated Voltages for Microprocessor
Core, Clock, and GTL
Compatible with HIP6016
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
RT9227ACS
(Plastic SOP-24)
VCC
VID4
VID3
VID2
VID1
VID0
PGOOD
FAULT
SS
NC
FB2
VIN2
Pin Configurations
TOP VIEW
1
2
3
4
5
6
7
8
9
10
11
12
UGATE1
23
PHASE1
22
LGATE1
24
Ordering Information
RT9227A
Package type
S : SOP-24
Operating temperature range
C: Commercial standard
PGND
20
OCSET1
19
VSEN1
18
FB1
21
17
16
15
14
13
NC
FB3
GATE3
GND
VOT2
DS9227A-02 July 2001
www.richtek-ic.com.tw
1

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