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  Richtek Technology Electronic Components Datasheet  

RT9228 Datasheet

Advanced PWM and Dual Fixed Linear Power Controller

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RT9228
Advanced PWM and Dual Fixed Linear Power Controller
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.
Ordering Information
RT9228
Package Type
S : SOP-24
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
cial Standard)
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.
DS9228-06 March 2007
Features
z 3-in-one Regulated Voltages for Microprocessor
Core, Clock, and GTL
z Compatible with HIP6016
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 RDS(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
z RoHS Compliant and 100% Lead (Pb)-Free
Applications
z Full Motherboard Power Regulation for Computer
z Low-voltage Distributed Power Supplies
Pin Configurations
(TOP VIEW)
VCC
VID4
VID3
VID2
VID1
VID0
PGOOD
FAULT
SS
NC
FB2
VIN2
2
3
4
5
6
7
8
9
10
11
12
24 UGATE1
23 PHASE1
22 LGATE1
21 PGND
20 OCSET1
19 VSEN1
18 FB1
17 NC
16 FB3
15 GATE3
14 GND
13 VOUT2
SOP-24
www.richtek.com
1


  Richtek Technology Electronic Components Datasheet  

RT9228 Datasheet

Advanced PWM and Dual Fixed Linear Power Controller

No Preview Available !

RT9228
Typical Application Circuit
12V
5V
GND
L1
F1 1uH
15A
C1-4
4 x 1000uF
R1
10
C5-6
2 x 1uF
3.3V
VOUT3
1.5V
VOUT2
2.5V
Q3
RFD3055
C9
1000uF
C10
270uF
C20
1uF
1
VCC
12 VIN2
OSET1
C8
1000uF
PGOOD
15 GATE3
16 FB3
UGATE1
PHASE2
RT9228
13 VOUT2 LGATE1
11 FB2
PGND
20
7
24
23
22
21
6 VID0
5 VID1
4 VID2
3 VID3
2 VID4
VSEN1
FB1
FAULT
SS
GND
14
19
18
8
9
C7
1000pF
R2
1.21K
Q1
PHB83N03LT
Q2
PHB95N03LT
C12
0.039uF
POWERGOOD
L2
3.5uH
R3
10K
R4
4.99K
C13-19
7 x 1000uF
C11
R5 0.68uF
732K
VOUT1
1.3V to 3.5V
Function Block Diagram
VSEN1
OCSET1
VCC
FB3
GATE3
VIN2
VOUT2
FB2
FAULT
3.3V
- 0.3V
++
-
+
- 1.26V
+
-
+ OC2
0.25A -
Soft Start
& Fault Logic
VCC
11uA
5V
DACOUT
TTL D/A
Converter
(DAC)
110%
90%
115%
+
-
+
-
+ Over Voltage
-
Power-On 3.3V
Reset (POR)
VCC
OC1 +
-
Inhibit
PWM
+
-
Error
Comparator
+
-
PWM
Amplifier
Gate
Control
Logic
VCC
Oscillator
Compensation
Lower
Drive
PGOOD
UGATE1
PHASE1
LGATE1
PGND
GND
SS FB1
www.richtek.com
2
DS9228-06 March 2007


Part Number RT9228
Description Advanced PWM and Dual Fixed Linear Power Controller
Maker Richtek
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RT9228 Datasheet PDF






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