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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 Nchannel MOSFET or a low cost NPN bipolar transistor to provide 1.5V 2.5%. 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 buildin 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.
Features
4-in-one Regulated Voltages for Microprocessor Core, I/O, Clock, and GTL Compatible with HIP6019B 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 User-adjustable 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 RT9229CS (Plastic SOP-28)
UGATE2 PHASE2 VID4 VID3 VID2 VID1 VID0 PGOOD OCSET2
1 2 3 4 5 6 7 8 9
Pin Configurations
TOP VIEW
28 27 26 25 24 23 22 21 20 19 18
VCC UGATE1 PHASE1 LGATE1 PGND OCSET1 VSEN1 FB1 NC1
Ordering Information
RT9229 Package type S : SOP-28 Operating temperature range C: Commercial standard
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FB2 10 NC2 11 SS 12 FAULT 13 FB4 14
FB3 GATE3 17 GND 16 VOUT4
15
VSEN2
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RT9229
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 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. +12V 10% 0C to 70C 0C to 125C
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 VOCSET1 (and 2) Threshold Reference and DAC DAC (VID0 - VID4) Input Low Voltage DAC (VID0 - VID4) Input High Voltage DACOUT Voltage Accuracy DACOUT Voltage Accuracy Reference Voltage (Pin FB2 and FB3) VREF DACOUT = 2.05 ~ 3.50V DACOUT = 1.30 ~ 2.00V -2.0 -1 -1% 1.240 ----1.265 0.8 -1 20mV 1.290 V V % -V VOCSET = 4.5V VOCSET = 4.5V 7.5 7 ---1.25 9.5 9 -V V V ICC UGATE1, GATE2, GATE3, LGATE1, and VOUT4 Open -10 -mA Symbol Test Conditions Min Typ Max Units
To be continued
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Parameter Oscillator Free Running Frequency Ramp Amplitude Linear Regulator Regulation Under-voltage Level Under-voltage Hysteresis Over-current Protection Over-current Protection During Startup Linear Controller Regulation Under-voltage Level Under-voltage Hysteresis Output Drive Current 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 VOUT1 Over-voltage Trip VOUT2 Over-voltage Trip FAULT Souring Current OCSET1 (and 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 90 ----2 -112 94 -0.5 % % % V IOCSET ISS VSEN1 Rising VSEN2 Rising VFAULT = 8V VOCSET = 4.5VDC VSS = 1V 112 4.1 10 170 -115 4.3 14 200 11 118 4.5 -230 -% V mA A A RUGATE RUGATE ILGATE1 VCC = 12V VCC - VUGATE = 1V VUGATE = 1V VCC = 12V, VLGATE1 = 2V ----3 3 1 2 7 7 -6 A -65 -dB VIN2 - VOUT3 > 1.5V VSEN3 = GATE3 0 < IGATE3 < 20mA FB3 Rising -2.5 --20 -75 100 40 2.5 87 --% % mV mA IOVP 10mA < IVOUT2 < 150mA FB4 Rising -2.5 --180 --75 100 230 700 2.5 87 ---% % mV mA mA VOSC 180 -200 1.9 225 -kHz VP-P Symbol Test Conditions Min Typ Max Units
RLGATE1 VLGATE1 = 1V
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RT9229
Function Block Diagram
OCSET2 FB3 GATE3
VSEN2 1.26V LINEAR UNDER VOLTAGE
VSEN1
OCSET1
VCC
_ +
0.3V
LUV
200A
110% + _ 90%
POWER-ON RESET (POR)
+ _ + _
200A OC4 OC OC2
_
FB4 UGATE2
INHIBIT GATE PWM2 CONTROL _
+
+
COMPENSATION FB2
1.26V
PWM COMP2
ERROR AMP2
ERROR AMP1
PWM COMP1
VSEN2
2.5V
VCC
OSCILLATOR
DACOUT
11A 5V
4.3V
COMPENSATION
FAULT
SS
FB1
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_
_
_
PHASE2
SOFT-START & FAULT LOGIC
0V OC1
_
VCC
_
_
_
_
0.25V
115%
_ + _
PWM1
VOUT2
VCC UPPER DRIVE
PGOOD UGATE1
+
+
+ + + + + +
INHIBIT
PHASE1
GATE CONTROL LOGIC
VCC LOWER DRIVE
+
LGATE1 PGND GND
TTL D/A CONVERTER (DAC)
VID0 VID2 VID4 VID1 VID3
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RT9229
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. SS (Pin 12) 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) 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 undervoltage 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 (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: IPEAK = IOCSETxROCSET RDS(ON) FB4 (Pin 14) Connect this pin to a resistor divider to set the linear regulator output. 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. Connect a capacitor from this pin to ground. This capacitor, along with an internal 11A (VSS>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 (VCC = 12V) in the event of an over-voltage or over-current condition. An over-current trip cycles the soft-start function. Sustaining an over-current for 2 soft-start intervals shuts down the controller.
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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.
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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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Typical Application Circuit
12V F1 5V 30A GND L1 1H C1-4 4x1000F + C9 1000pF R1 1.21k Q3 HUF76137S3S L2 + 5.2H R3 4.99K C22 0.68F
D1 MBR2535CTL
R12 10 C5-6 2x1F C7 1F 28 9 23 VCC OCSET2 OCSET1 PGOOD UGATE1 8 27 Q1 HUF76139S2S C8 1000pF R2 1.21k POWERGOOD R13 4.99K + R4 4.99K C17 R7 0.68F 732K C10-16 7x1000F
1 2
UGATE2 PHASE2
VOUT2 3.3V C18-21 4x1000F
L3 2.9H
PHASE1 26
RT9229
LGATE1 PGND FB2 VSEN1
VOUT1 1.3 to 3.5V
15 VSEN2 R5 3.32K R6 5.11K 10
25 24 22
Q2 HUF76139S2S
FB1 21 VID0 7 6 VID1 VID2 5 4 VID3 3 VID4 SS GND 17 12 C25 0.039F
Q4 HUF75307D3S VOUT3 GTL = 1.5V R8 + C23 1000F 187 R9 1K
18 19
GATE3 FB3
VOUT4 2.5V
R10 + C24 270F 1K
16 VOUT4 14 FB4 R11 FAULT 1K 13
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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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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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