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RT9228 Datasheet(PDF) 1 Page - Richtek Technology Corporation

Part No. RT9228
Description  Advanced PWM and Dual Fixed Linear Power Controller
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Maker  RICHTEK [Richtek Technology Corporation]
Homepage  http://www.richtek.com
Logo RICHTEK - Richtek Technology Corporation

RT9228 Datasheet(HTML) 1 Page - Richtek Technology Corporation

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RT9228
1
DS9228-06
March 2007
www.richtek.com
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
±±±±± 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
Fixed Linear Regulator Output Voltage
MOSFET or NPN Driving Capability
Ultra Fast Response Speed
Under-Voltage Protection
Internal Thermal Shutdown
RoHS Compliant and 100% Lead (Pb)-Free
Pin Configurations
Applications
Full Motherboard Power Regulation for Computer
Low-voltage Distributed Power Supplies
Ordering Information
General Description
The RT9228 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 RT9228 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 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 RT9228 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.
(TOP VIEW)
SOP-24
Advanced PWM and Dual Fixed Linear Power Controller
VCC
VID4
VID3
VID2
OCSET1
PGND
LGATE1
UGATE1
VID1
VID0
FB1
VSEN1
PGOOD
PHASE1
NC
FAULT
SS
GATE3
FB3
NC
FB2
VOUT2
GND
VIN2
4
5
6
19
20
21
7
8
9
16
17
18
10
11
12
13
14
15
2
3
22
23
24
Note :
RichTek Pb-free and Green products are :
RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
Suitable for use in SnPb or Pb-free soldering processes.
100%matte tin (Sn) plating.
RT9228
Package Type
S : SOP-24
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
cial Standard)


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