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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 userselectable 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 RDS(ON), which eliminates the need for a current sensing resistor.
Features
4-in-one Regulated Voltages for Microprocessor Core, AGP Bus, North/South Bridge and/or Cache Memory, GTL Bus Power Compatible with HIP6020 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
Applications
Full Motherboard Power Regulation for Computer Low-voltage Distributed Power Supplies
Pin Configurations
Part Number RT9230CS (Plastic SOP-28)
UGATE2 PHASE2 VID4 VID3 VID2 VID1 VID0 PGOOD OCSET2 VSEN2 SELECT SS FAULT VSEN4
1 2 3 4 5 6 7 8 9 10 11 12 13 14
Pin Configurations
TOP VIEW
28 27 26 25 24 23 22 21 20 19 18
VCC UGATE1 PHASE1 LGATE1 PGND OCSET1 VSEN1 FB1 NC
Ordering Information
RT9230 Package type S : SOP-28 Operating temperature range C: Commercial standard
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VSEN3 DRIVE3 17 GND 16 VAUX
15
DRIVE4
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Absolute Maximum Ratings
Supply Voltage PGOOD, FAULT and GATE Voltage Input, Output or I/O Voltage Ambient Temperature Range Junction Temperature Range Storage Temperature Range Lead Temperature (Soldering, 10 sec.) Package Thermal Resistance SOP-28, JA 60C/W +15V GND-0.3V to VCC+0.3V GND-0.3V to 7V 0C to +70C 0C to +125C -65C to +150C 300C
Recommended Operating Conditions
Supply Voltage Ambient Temperature Range Junction Temperature Range +12V 10% 0C to 70C 0C to 125C
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.
Electrical Characteristics
(VCC = 12V, PGND = 0V, TA = 25C, unless otherwise specified) Parameter VCC Supply Current Nominal Supply Current Power-on Reset VCC Rising Threshold VCC Falling Threshold Rising VAUX Threshold VAUX Threshold Hysteresis Rising VOCSET1 (and 2) Threshold Oscillator Free Running Frequency Ramp Amplitude VOSC 180 -200 1.9 225 -kHz V P-P VOCSET = 4.5V VOCSET = 4.5V VOCSET = 4.5V VOCSET = 4.5V 7.5 7 -----2.8 0.5 1.25 9.5 9 ---V V V V V ICC UGATE1, LGATE1, UGATE2, DRIVE3, and DRIVE4 Open -10 -mA Symbol Test Conditions Min Typ Max Units
To be continued
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Parameter DAC (VID0 ~ VID4) Input Low Voltage DAC (VID0 ~ VID4) Input High Voltage DACOUT Voltage Accuracy DACOUT Voltage Accuracy AGP PWM Reference Voltage AGP PWM Reference Voltage AGP PWM Reference Voltage Tolerance 1.5V and 1.8V Linear Regulators (VOUT3 and VOUT4) Regulation VSEN3 Under-voltage Level VSEN3 Under-voltage Hysteresis VSEN4 Under-voltage Level VSEN4 Under-voltage Hysteresis Output Drive Current Synchronous PWM Controller Error Amplifier DC Gain PWM Controller Gate Driver UGATE 1 (and 2) Source UGATE 1 (and 2) Sink LGATE Source LGATE Sink Protection VSEN1 Over-voltage (VSEN1/DACOUT) FAULT Sourcing Current OCSET1, 2 Current Source Soft-start Current Power Good VOUT1 Upper Threshold VOUT1 Under Voltage VOUT1 Hysteresis (VSEN1/DACOUT) PGOOD Voltage Low VSEN1 Rising VSEN1 Rising Upper/Lower Threshold VPGOOD IPGOOD = -4mA 108 87 ----2 -112 95 -0.5 % % % V IOCSET ISS VSEN1 Rising VFAULT/RT = 2.0V VOCSET = 4.5V 112 10 170 -115 14 200 28 120 -230 -% mA A A RUGATE RUGATE ILGATE1 VCC = 12V, VCC-VUGATE = 1V VUGATE = 1V VCC = 12V, VLGATE1 = 2V ----4 3 1 2 7 7 -6 A -65 -dB VSEN3 Rising VSEN3 Falling VSEN4 Rising VSEN4 Falling VAUX = 5V -3 ----20 -1.125 100 1.350 100 40 3 -----% V mV V mV mA DACOUT = 2.05 ~ 3.50V DACOUT = 1.30 ~ 2.00V SELECT < 0.8V SELECT > 2.0V Symbol Test Conditions Min -2 -1 -1% ---2.5 Typ ----1.5 3.3 -Max 0.8 -1 20mV --2.5 Units DAC and Standard Buck Regulator Reference V V % -V V %
RLGATE1 VLGATE1 = 1V
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Function Block Diagram
VSEN3
VAUX
OCSET2
VSEN1
OCSET1
VCC
+
GATE3
_
75% + _
LUV LINEAR UNDER VOLTAGE
200 A
110% + _ 90%
POWER-ON RESET (POR)
VAUX
DRIVE4 VSEN4
VCC
+ _
+ +
1.26V
VCC UPPER DRIVE
PGOOD UGATE1
200 A DRIVE2 OC2 OV
115%
GATE CONTROL COMPENSATION VSEN2
+ _
INHIBIT PWM COMP2
+
PWM2
+ +
ERROR AMP2
ERROR AMP1
PWM COMP1
+ SELECT
1.5V or 3.3V
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_
75%
VCC
OSCILLATOR
DACOUT
28A 5V
COMPENSATION
FAULT
SS
FB1
_
_
_
_
PHASE2
SOFT-START & FAULT LOGIC
INHIBIT FAULT
OC1
_
_
UGATE2
_ + +
_ + +
+ GATE CONTROL PWM1 LOGIC
LOWER DRIVE
PHASE1
VCC
LGATE1 PGND GND
TTL D/A CONVERTER (DAC)
VID0 VID2 VID4 VID1 VID3
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RT9230
Functional Pin Description
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. 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 (ROCSET) from this pin to the drain of the upper MOSFET. ROCSET, an internal 200A current source (IOCSET), and the upper MOSFET onresistance (RDS(ON)) set the converter over-current (OC) trip point according to the following equation: IOCSETxROCSET IPEAK = RDS(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. 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 28A (VSS>1V) current source, sets the soft-start interval of the converter. FAULT (Pin 13) This pin is low during normal operation, but it is pulled to about 8V (VCC = 12V) in the event of an 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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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 Pin Name VID4 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 VID3 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 VID2 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 VID1 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 VID0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 Normal OUT1 Voltage DACOUT 1.30 1.35 1.40 1.45 1.50 1.55 1.60 1.65 1.70 1.75 1.80 1.85 1.90 1.95 2.00 2.05 INHIBIT 2.10 2.20 2.30 2.40 2.50 2.60 2.70 2.80 2.90 3.00 3.10 3.30 3.30 3.40 3.50
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RT9230
Typical Application Circuit
12V F1 5V GND 15A L1 1H C9 1000pF R1 1.21k Q3 HUF76137S3S L2 V OUT2 3.3V or 1.5V + 5.2H C18-19 2x1000F 1 2
D1 MBR2535CTL
R12 10 C1-4 4x1000F C8 1000pF R2 1.21k POWERGOOD Q1 PHB83N03LT R13 4.99K + R4 4.99K C17 R7 0.68 F 732K C10-16 7x1000F
C7 1F 9
28 23 VCC OCSET2 OCSET1 PGOOD UGATE1 8 27
C5-6 2x1F
UGATE2 PHASE2
L3 3.5H
RT9230
PHASE1 26 LGATE1 25 24 22 Q2 PHB95N03LT
V OUT1 1.3 to 3.5V
10 VSEN2 TYEDET +3.3V Q4 HUF75307D3S V OUT3 1.5V + 18 19 C20 1000F DRIVE3 VSEN3 11 SELECT
PGND VSEN1
FB1 21 VID0 7 VID1 6 VID2 5 4 VID3 3 VID4 SS 12 C22 0.1F
15
V OUT4 1.8V
DRIVE4 14 VSEN4 GND 17
+
C21 270F
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Package Information
H M
B
B
J
A C F D
I
Symbol A B C D F H I J M
Dimensions In Millimeters Min 17.704 7.391 2.362 0.330 1.194 0.229 0.102 10.008 0.381 Max 18.110 7.595 2.642 0.508 1.346 0.330 0.305 10.643 1.270
Dimensions In Inches Min 0.697 0.291 0.093 0.013 0.047 0.009 0.004 0.394 0.015 Max 0.713 0.299 0.104 0.020 0.053 0.013 0.012 0.419 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
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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