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RT9230
1.5V Advanced Dual PWM and Dual Linear Power Controller
General Description
The RT9230 is a 4-in-one power controller optimized
for high-performance microprocessor and computer
applications. The IC integrates two PWM controller,
two linear controllers 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
computer system’s AGP 1.5V or 3.3V bus power with
a standard buck converter. The first linear regulator
provides power for the 1.5V GTL bus and the second
linear regulator provides 1.8V power for the
North/South Bridge core voltage and/or cache
memory circuits.
The RT9230 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 second PWM controller is user-
selectable for output level of 1.5V and 3.3V with
±2.5% accuracy. The linear controllers drives
external N-MOSFET or NPN bipolar for the pass
transistor to provide fixed output voltages of 1.5V
±3% and 1.8V ±3%.
The RT9230 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 MOSFET’s
R
, which eliminates the need for a current
DS(ON)
sensing resistor.
Ordering Information
RT9230
Package type
S : SOP-28
Operating temperature range
C: Commercial standard
Features
z
4-in-one Regulated Voltages for Microprocessor
Core, AGP Bus, North/South Bridge and/or
Cache Memory, GTL Bus Power
z
Compatible with HIP6020
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
Fixed 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
Pin Configurations
Part Number Pin Configurations
RT9230CS
(Plastic SOP-28)
UGATE2
PHASE2
VID4
VID3
VID2
VID1
VID0
PGOOD
OCSET2
VSEN2
SELECT
FAULT
VSEN4
TOP VIEW
1
2
3
4
5
6
7
8
9
10
11
12 17
SS
13
14
28
27
26
25
24
23
22
21
20
19
18
16
15
VCC
UGATE1
PHASE1
LGATE1
PGND
OCSET1
VSEN1
FB1
NC
VSEN3
DRIVE3
GND
VAUX
DRIVE4
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RT9230
Absolute Maximum Ratings
z
Supply Voltage +15V
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
JA
Recommended Operating Conditions
z
Supply Voltage +12V ±10%
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.
60°C/W
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, LGATE1, UGATE2,
DRIVE3, and DRIVE4 Open
Power-on Reset
VCC Rising Threshold
VCC Falling Threshold
Rising VAUX Threshold
VAUX Threshold Hysteresis
Rising V
OCSET1 (and 2)
Threshold
V
V
V
V
OCSET
OCSET
OCSET
OCSET
= 4.5V
= 4.5V
= 4.5V
= 4.5V
Oscillator
Free Running Frequency 180 200 225
Ramp Amplitude
∆V
OSC
-- 10 -- mA
7.5 -- 9.5 V
7--9V
-- 2.8 -- V
-- 0.5 --
-- 1.25 --
-- 1.9 --
To be continued
V
V
kHz
V
P-P
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Parameter Symbol Test Conditions Min Typ Max Units
DAC and Standard Buck Regulator Reference
RT9230
DAC (VID0 ~ VID4) Input Low Voltage -- -- 0.8
DAC (VID0 ~ VID4) Input High Voltage 2 -- --
DACOUT Voltage Accuracy DACOUT = 2.05 ~ 3.50V -1 -- 1
DACOUT Voltage Accuracy DACOUT = 1.30 ~ 2.00V -1% -- 20mV
AGP PWM Reference Voltage
AGP PWM Reference Voltage
SELECT < 0.8V
SELECT > 2.0V
-- 1.5 --
-- 3.3 --
AGP PWM Reference Voltage Tolerance -2.5 -- 2.5
1.5V and 1.8V Linear Regulators (V
OUT3
and V
OUT4
)
Regulation -3 -- 3
VSEN3 Under-voltage Level VSEN3 Rising -- 1.125 --
VSEN3 Under-voltage Hysteresis VSEN3 Falling -- 100 --
VSEN4 Under-voltage Level VSEN4 Rising -- 1.350 --
VSEN4 Under-voltage Hysteresis VSEN4 Falling -- 100 --
Output Drive Current VAUX = 5V 20 40 --
Synchronous PWM Controller Error Amplifier
DC Gain -- 65 --
PWM Controller Gate Driver
V
V
%
--
V
V
%
%
V
mV
V
mV
mA
dB
UGATE 1 (and 2) Source
UGATE 1 (and 2) Sink
LGATE Source
LGATE Sink
R
UGATE
R
UGATEVUGATE
I
LGATE1
R
LGATE1VLGATE1
VCC = 12V, VCC-V
VCC = 12V, V
= 1V
= 1V
LGATE1
UGATE
= 2V
= 1V
-- 4 7
-- 3 7
-- 1 --
-- 2 6
Protection
VSEN1 Over-voltage (VSEN1/DACOUT) VSEN1 Rising 112 115 120
FAULT Sourcing Current
OCSET1, 2 Current Source
Soft-start Current
V
FAULT/RT
I
OCSETVOCSET
I
SS
= 2.0V
= 4.5V
10 14 --
170 200 230
-- 28 --
Power Good
V
Upper Threshold
OUT1
V
Under Voltage
OUT1
V
Hysteresis (VSEN1/DACOUT)
OUT1
PGOOD Voltage Low
V
PGOODIPGOOD
VSEN1 Rising 108 -- 112
VSEN1 Rising 87 -- 95
Upper/Lower Threshold -- 2 --
= -4mA
-- -- 0.5
Ω
Ω
A
Ω
%
mA
µA
µA
%
%
%
V
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RT9230
Function Block Diagram
GATE3
DRIVE4
VSEN4
UGATE2
PHASE2
VSEN2
SELECT
VAUX
VCC
CON TROL
COMPEN-
75%
+
1.5V or 3.3V
_
+
+
+
_
1.26V
DRIVE2
GATE
SATION
+
_
VSEN3
75%
INHIBIT
PWM2
+
+
+
OC2
_
PWM
COMP2
+
_
_
+
ERROR
AMP2
OSCILLATOR
_
LINEAR
UNDER
VOLTAGE
_
200µA
SOFT-START
INHIBIT
FAULT
OCSET2
LUV
& FAULT
LOGIC
OV
VCC
110%
28µA
5V
90%
115%
+
ERROR
AMP1
DACO UT
+
_
+
_
+
_
OC1
+
_
COMP1
COMPEN-
SATION
OCSET1VSEN1
200µA
_
_
PWM
+
PWM1
POWER-ON
RESET (POR)
UPP ER
DRIVE
GATE
CON TROL
LOGIC
LOWER
DRIVE
TTL D/ A
CON VER TER
(DAC)
VCC
VAUX
VCC
PGOOD
UGATE1
PHASE1
VCC
LGATE1
PGND
GND
FAULT
SS
FB1
VID0
VID1
VID2
VID3
VID4
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Functional Pin Description
RT9230
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 TTL-compatible the input pins to the 5-bit
DAC. The state logic of these five pins program the
internal voltage reference, DACOUT. The level of
DACOUT sets the microprocessor core converter
output voltage, as well as the corresponding PGOOD
and OVP thresholds. Table 1 specifies the DACOUT
voltage of 32 combinations of VID levels.
VSEN2 (Pin 10)
Connect this pin to the output of the standard buck
PWM regulator. The voltage at this pin is regulated to
the level pre-determined by the logic-level status of
the SELECT pin. This pin is also monitored by the
PGOOD comparator circuit.
SELECT (Pin 11)
This pin determines the output voltage of the AGP
bus switching regulator. A low TTL input sets the
output voltage to 1.5V while a high input sets the
output voltage to 3.3V.
SS (Pin 12)
Connect a capacitor from this pin to ground. This
capacitor, along with an internal 28µA (V
SS
>1V)
current source, sets the soft-start interval of the
converter.
PGOOD (Pin 8)
PGOOD is an open collector output used to indicate
the status of the PWM converter output voltage. This
pin is pulled low when the synchronous regulator
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.
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)
An over-current trip cycles the soft-start function.
The voltage at this pin is monitored for power-on
reset (POR) purposes and pulling this pin low with an
open drain device will shutdown 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.
VSEN4 (Pin 14)
Connect this pin to the output of the 1.8V regulator.
This pin is monitored for under-voltage events.
DRIVE4 (Pin 15)
Connect this pin to the gate of an external MOSEFT.
This pin provides the drive for the 1.8V regulator’s
pass transistor.
VAUX (Pin 16)
The +3.3V input voltage at this pin is monitored for
power-on reset (POR) purpose. Connected to +5V
input, this pin provides boost current for the two
linear regulator output drives in the event bipolar
NPN transistors (instead of N-channel MOSFETs)
are employed as pass elements.
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RT9230
GND (Pin 17)
Signal ground for the IC. All voltage levels are
measured with respect to this pin.
DRIVE3 (Pin 18)
Connect this pin to the gate of an external MOSEFT.
This pin provides the drive for the 1.5V regulator’s
pass transistor.
VSEN3 (Pin 19)
Connect this pin to the output of the 1.5V linear
regulator. This pin is monitored for under-voltage
events.
FB1 (Pin 21)
The FB1 pin is the inverting input of the error
amplifier.
VSEN1 (Pin 22)
This pin is connected to the PWM converter’s output
voltage. The PGOOD and OVP comparator circuits
use the signal to report output voltage status and for
over-voltage protection.
PGND (Pin 24)
This is the power ground of UGATE1, LGATE1, and
UGATE2 connection. Tie the synchronous PWM
converter’s lower MOSFET source to this pin.
LGATE1 (Pin 25)
Connect LGATE to the 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. The voltage at this
pin monitored for power-on reset (POR) purpose.
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Table 1. VOUT1 Voltage Program
RT9230
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
Normal OUT1 Voltage
DACOUT
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
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RT9230
Typical Application Circuit
V
OUT2
3.3V o r 1.5V
TYEDET
+3.3V
V
OUT3
1.5V
V
OUT4
1.8V
12V
5V
15A
GND
HUF75307D3 S
F1
+
Q4
C20
1000µF
+
C21
270µF
L1
1µH
HUF76137S 3S
L2
5.2µH
+
C18-1 9
2x1 000µF
Q3
C9
1000pF
R1
1.21k
D1
MBR2535CTL
10
11
18
19
15
14
9
OCSET2
1
UGATE2
2
PHASE2
VSEN2
SELECT
DRIVE3
VSEN3
DRIVE4
VSEN4
R12
10
C7
1µF
28
VCC
OCSET1
OCSET1
PGOOD
UGATE1
PHASE1
RT9230
LGATE1
GND
17
PGND
VSEN1
FB1
VID0
VID1
VID2
VID3
VID4
SS
C1-4
4x1 000µF
1000pF
23
8
27
26
25
24
22
21
7
6
5
4
3
12
C8
R2
1.21k
Q1
PHB83N03LT
Q2
PHB95N03LT
C22
0.1µF
C5-6
2x1µF
L3
3.5µH
R4
4.99K
R7
732K
POWERGOOD
R13
4.99K
+
C10-1 6
7x1 000µF
C17
0.68µF
V
OUT1
1.3 to 3.5 V
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Package Information
RT9230
H
M
B
A
C
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
DS9230-03 July 2001 www.richtek-ic.com.tw
0.015 0.050
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RT9230
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 DS9230-03 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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