RT9229
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%.
Features
z
4-in-one Regulated Voltages for Microprocessor
Core, I/O, Clock, and GTL
z
Compatible with HIP6019B
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
z
Over-voltage Protection Uses Lower MOSFET
DS(ON)
Linear Section
z
User-adjustable Linear Regulator Output Voltage
z
MOSFET or NPN Driving Capability
z
Ultra Fast Response Speed
z
Under-voltage Protection
z
Internal Thermal Shutdown
Applications
Full Motherboard Power Regulation for Computer
z
Low-voltage Distributed Power Supplies
z
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 R
DS(ON)
which
eliminates the need for a current sensing resistor.
Ordering Information
RT9229
Package type
Pin Configurations
Part Number Pin Configurations
RT9229CS
(Plastic SOP-28)
UGATE2
PHASE2
VID4
VID3
VID2
VID1
VID0
PGOOD
OCSET2
FB2
NC2
SS
FAULT
FB4
TOP VIEW
1
2
3
4
5
6
7
8
9
10
11
12 17
13
14
28
27
26
25
24
23
22
21
20
19
18
16
15
VCC
UGATE1
PHASE1
LGATE1
PGND
OCSET1
VSEN1
FB1
NC1
FB3
GATE3
GND
VOUT4
VSEN2
S : SOP-28
Operating temperature range
C: Commercial standard
DS9229-03 July 2001 www.richtek-ic.com.tw
1
RT9229
Absolute Maximum Ratings
z
Supply Voltage
z
PGOOD, FAULT and GATE Voltage GND−0.3V to VCC+0.3V
z
Input, Output or I/O Voltage GND−0.3V to 7V
z
Ambient Temperature Range 0°C to +70°C
z
Junction Temperature Range 0°C to +125°C
z
Storage Temperature Range −65°C to +150°C
z
Lead Temperature (Soldering, 10 sec.) 300°C
z
Package Thermal Resistance
SOP-28, θ
60°C/W
JA
Recommended Operating Conditions
z
Supply Voltage
z
Ambient Temperature Range 0°C to 70°C
z
Junction Temperature Range 0°C to 125°C
CAUTION:
Stresses beyond the ratings specified in “Absolute Maximum Ratings” may cause permanent damage to the
device. This is a stress only rating and operation of the device at these or any other conditions above those
indicated in the operational sections of this specification is not implied.
+15V
+12V ±10%
Electrical Characteristics
(V
= 12V, PGND = 0V, TA = 25°C, unless otherwise specified)
CC
Parameter Symbol Test Conditions Min Typ Max Units
VCC Supply Current
Nominal Supply Current
I
CC
UGATE1, GATE2, GATE3,
LGATE1, and VOUT4 Open
Power-on Reset
VCC Rising Threshold
VCC Falling Threshold
Rising V
OCSET1 (and 2)
V
V
Threshold
OCSET
OCSET
= 4.5V
= 4.5V
Reference and DAC
DAC (VID0 – VID4) Input Low Voltage -- -- 0.8
DAC (VID0 – VID4) Input High Voltage 2.0 -- --
DACOUT Voltage Accuracy DACOUT = 2.05 ~ 3.50V -1 -- 1
DACOUT Voltage Accuracy DACOUT = 1.30 ~ 2.00V -1% -- 20mV
Reference Voltage (Pin FB2 and FB3)
V
REF
-- 10 -- mA
7.5 -- 9.5 V
7--9V
-- 1.25 -- V
1.240 1.265 1.290
To be continued
V
V
%
--
V
www.richtek-ic.com.tw DS9229-03 July 2001
2
Oscillator
RT9229
Parameter Symbol Test Conditions Min Typ Max Units
Free Running Frequency 180 200 225
Ramp Amplitude
∆V
OSC
-- 1.9 --
Linear Regulator
Regulation
10mA < I
VOUT2
< 150mA
-2.5 -- 2.5
Under-voltage Level FB4 Rising -- 75 87
Under-voltage Hysteresis -- 100 --
Over-current Protection
Over-current Protection During Startup
I
OVP
180 230 --
-- 700 --
Linear Controller
Regulation
VSEN3 = GATE3
GATE3
< 20mA
0 < I
-2.5 -- 2.5
Under-voltage Level FB3 Rising -- 75 87
Under-voltage Hysteresis -- 100 --
Output Drive Current
VIN2 – VOUT3 > 1.5V
20 40 --
PWM Controller Error Amplifier
DC Gain -- 65 --
kHz
V
P-P
%
%
mV
mA
mA
%
%
mV
mA
dB
PWM Controller Gate Driver
UGATE 1 (and 2) Source
UGATE 1 (and 2) Sink
LGATE Source
LGATE Sink
Protection
V
Over-voltage Trip
OUT1
V
Over-voltage Trip
OUT2
FAULT Souring Current
OCSET1 (and 2) Current Source
Soft-start Current
Power Good
V
Upper Threshold
OUT1
V
Under Voltage
OUT1
V
Hysteresis (VSEN1/DACOUT)
OUT1
PGOOD Voltage Low
R
UGATE
R
UGATEVUGATE
I
LGATE1
R
LGATE1VLGATE1
VCC - V
VCC = 12V, V
VSEN1 Rising 112 115 118
VSEN2 Rising 4.1 4.3 4.5
VCC = 12V
V
FAULT
I
OCSET
I
SS
V
OCSET
VSS = 1V
VSEN1 Rising 108 -- 112
VSEN1 Rising 90 -- 94
Upper/Lower Threshold -- 2 --
V
PGOODIPGOOD
UGATE
= 1V
= 1V
= 8V
= 4.5V
= -4mA
= 1V
LGATE1
DC
= 2V
-- 3 7
-- 3 7
-- 1 --
-- 2 6
10 14 --
170 200 230
-- 11 --
-- -- 0.5
Ω
Ω
A
Ω
%
V
mA
µA
µA
%
%
%
V
DS9229-03 July 2001 www.richtek-ic.com.tw
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RT9229
Function Block Diagram
FB3
GATE3
VOUT2
FB4
UGATE2
PHASE2
FB2
VSEN2
VSEN2
0.25V
VCC
2.5V
_
+
1.26V
+
_
+
_
GATE
CONTROL
COMPEN-
SATION
_
+
_
+
4.3V
1.26V
0.3V
INHIBIT
PWM2
PWM
COMP2
+
VOLTAGE
+
+
OC4
+
OC2
_
+
_
_
ERROR
AMP2
OSCILLATOR
LINEAR
UNDER
_
_
200µA
SOFT-START
OCSET2
LUV
OC
& FAULT
LO GIC
VCC
110%
11µA
5V
90%
115%
0V
DACO UT
+
+
+
+
_
ERROR
AMP1
COMPEN-
SATION
_
_
_
OC1
OCSET1VSEN1
200µA
+
_
+
_
PWM
COMP1
INHIBIT
GATE
CONTROL
PWM1
LO GIC
TTL D/ A
CONVERTER
(DAC)
VCC
POWER-ON
RESET (POR)
UPP ER
DRIVE
LOWER
DRIVE
VCC
VCC
PGOOD
UGATE1
PHASE1
LG ATE1
PGND
GND
FAULT
SS
FB1
VID0
VID1
VID2
VID3
VID4
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Functional Pin Description
RT9229
UGATE1, UGATE2 (Pins 27 and 1)
Connect UGATE pins to the respective PWM
converter’s upper MOSFET gate. This pin provides
the gate drive for the upper MOSFETs.
PHASE1, PHASE2 (Pins 26 and 2)
Connect the PHASE pins to the PWM converter’s
upper MOSFET source. These pins are used to
monitor the voltage drop across the upper MOSFETs
for over-current protection.
VID0, VID1, VID2, VID3, VID4 (Pin 7, 6, 5, 4, and 3)
VID0~4 are the input pins to the 5-bit DAC. The
states of these five pins program the internal voltage
reference, DACOUT. The level of DACOUT sets the
core converter output voltage (VOUT1). It also sets
the core PGOOD and OVP thresholds. Table 1
specifies the DACOUT voltage of 32 combinations of
VID levels.
PGOOD (Pin 8)
An over-current trip cycles the soft-start function.
Sustaining an over-current for 2 soft-start intervals
shuts down the controller.
SS (Pin 12)
Connect a capacitor from this pin to ground. This
capacitor, along with an internal 11µA (V
SS
>1V)
current source, sets the soft-start interval of the
converter.
Pulling this pin low with an open drain signal will shut
down the IC.
FAULT (Pin 13)
This pin is low during normal operation, but it is
pulled to about 8V (V
= 12V) in the event of an
CC
over-voltage or over-current condition.
FB4 (Pin 14)
Connect this pin to a resistor divider to set the linear
regulator output.
PGOOD is an open collector output used to indicate
the status of the PWM converter output voltage. This
pin is pulled low when the core output is not within
±10% of the DACOUT reference voltage, or when
any of the other outputs are below their under-
voltage thresholds. The PGOOD output is open for
‘11111’VID code. See table 1.
FB1, FB2 (21 and 10)
FB1, 2 are the available external pins of the PWM
error amplifiers. Both the FB pins are the inverting
input of the error amplifiers.
OCSET1, OCSET2 (Pins 23 and 9)
Connect a resistor (R
of the upper MOSFET. R
current source (I
resistance (R
OCSET
) set the converter over-current
DS(ON)
) from this pin to the drain
OCSET
, an internal 200µA
OCSET
), and the upper MOSFET on-
(OC) trip point according to the following equation:
I
I
PEAK
=
OCSET×ROCSET
R
DS(ON)
VSEN1, VSEN2 (Pins 22 and 15)
These pins are connected to the PWM converters’
output voltage. The PGOOD and OVP comparator
circuits use these signals to report output voltage
status and for over-voltage protection. VSEN2
provides the input power to the integrated linear
regulator.
DS9229-03 July 2001 www.richtek-ic.com.tw
5
RT9229
VOUT4 (Pin 16)
Output of the linear regulator. Supplies current up to
230mA.
GATE3 (Pin 18)
Connect this pin to the gate of an external MOSFET
or the base of a NPN. This pin provides the drive for
the linear controller’s pass transistor.
FB3 (Pin 19)
Connect this pin to a resistor divider to set the linear
controller output voltage.
PGND (Pin 24)
This is the power ground of UGATE1, LGATE1, and
UGATE2. Tie the synchronous PWM converter’s
lower MOSFET source to this pin.
LGATE1 (Pin 25)
Connect LGATE1 to the synchronous PWM
converter’s lower MOSFET gate. This pin provides
the gate drive for the lower MOSFET.
VCC (Pin 28)
Provide a 12V bias supply for the IC to this pin. This
pin also provides the gate bias charge for all the
MOSFETs controlled by the IC.
www.richtek-ic.com.tw DS9229-03 July 2001
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Table 1. VOUT1 Voltage Program
RT9229
Pin Name
VID4 VID3 VID2 VID1 VID0
01111 1.30
01110 1.35
01101 1.40
01100 1.45
01011 1.50
01010 1.55
01001 1.60
01000 1.65
00111 1.70
00110 1.75
00101 1.80
00100 1.85
00011 1.90
00010 1.95
00001 2.00
00000 2.05
11111 INHIBIT
11110 2.10
11101 2.20
11100 2.30
11011 2.40
11010 2.50
11001 2.60
11000 2.70
10111 2.80
10110 2.90
10101 3.00
10100 3.10
10011 3.30
10010 3.30
10001 3.40
10000 3.50
Normal OUT1 Voltage
DACOUT
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RT9229
Typical Application Circuit
12V
GND
V
OU T2
3. 3V
C18-2 1
4x1000µF
V
OU T3
GTL = 1.5V
V
OU T4
2. 5V
5V
HUF75 307D3 S
F1
30A
Q4
+
C23
1000µF
+
L1
1µH
4x1000µF
HUF76 137S3S
L2
5. 2µH
+
4. 99K
C22
0. 68µF
C24
270µF
C1-4
R3
R8
187
R10
1K
+
Q3
D1
MBR2535CTL
R5
3. 32K
5. 11K
C9
1000pF
R1
1. 21 k
R6
R9
1K
R11
1K
9
1
2
15
10
18
19
16
14
C7
1µF
OCSET2
UGATE2
PHASE2
RT9229
VSEN2
FB2
GATE3
FB3
VOUT4
FB4
FAULT
13
28
VCC
OCSET1
OCSET1
PGOOD
UGA TE 1
PHASE1
LG ATE1
R12
10
PGND
VSEN1
VID0
VID1
VID2
VID3
VID4
GND
17
FB1
SS
C5-6
2x1µF
23
8
27
26
25
24
22
21
7
6
5
4
3
12
C8
1000pF
R2
1. 21k
Q1
HUF76 139S2S
Q2
HUF76 139S2S
C25
0. 039µF
L3
2. 9µH
R4
4. 99K
R7
732K
POWERGOOD
R13
4. 99K
+
C10-1 6
7x1000µF
C17
0. 68µF
V
OU T1
1. 3 to 3.5V
www.richtek-ic.com.tw DS9229-03 July 2001
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Package Information
RT9229
H
M
C
B
A
FD
Dimensions In Millimeters Dimensions In Inches
Symbol
Min Max Min Max
A 17.704 18.110 0.697 0.713
B 7.391 7.595 0.291 0.299
C 2.362 2.642 0.093 0.104
D 0.330 0.508 0.013 0.020
I
B
J
F 1.194 1.346 0.047 0.053
H 0.229 0.330 0.009 0.013
I 0.102 0.305 0.004 0.012
J 10.008 10.643 0.394 0.419
M 0.381 1.270
0.015 0.050
DS9229-03 July 2001 www.richtek-ic.com.tw
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RT9229
RICHTEK TECHNOLOGY CORP.
Headquarter
6F, No. 35, Hsintai Road, Chupei City
Hsinchu, Taiwan, R.O.C.
Tel: (8863)5510047 Fax: (8863)5537749
www.richtek-ic.com.tw DS9229-03 July 2001
RICHTEK TECHNOLOGY CORP.
Taipei Office (Marketing)
8F-1, No. 137, Lane 235, Paochiao Road, Hsintien City
Taipei County, Taiwan, R.O.C.
Tel: (8862)89191466 Fax: (8862)89191465
Email: marketing@richtek-ic.com.tw
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