RT9227A Preliminary Advanced PWM and Dual Fixed Linear Power Controller General Description Features The RT9227A is a 3-in-one power controller z 3-in-one Regulated Voltages for Microprocessor Core, Clock, and GTL optimized for high-performance microprocessor and a z Compatible with HIP6016 synchronous buck PWM controller, a linear regulator z Power-good Output Voltage Monitor computer applications. The IC integrates and a linear controller as well as monitoring and Switching section protection functions into a 24-pin SOP package. The 5-bit DAC Programmable from 1.3V to 3.5V PWM controller regulates the microprocessor core z voltage. The linear regulator provides power for the z clock driver circuit and the linear controller regulates z ±1% DAC Accuracy Fast Transient Response power for the GTL bus. z Full 0% to 100% Duty Cycle Driver z Fixed 200kHz Switching Frequency The RT9227A features an Intel-compatible, TTL 5-bit z Adaptive Non-overlapping Gate Driver programmable DAC that adjusts the core voltage z Over-current Monitor Uses MOSFET RDS(ON) from 2.1V to 3.5V in 0.1V increments and from 1.3V z Over-voltage Protection Uses Lower MOSFET to 2.05V in 0.05V steps. The 5-bit DAC has a typical Linear Section ±1% tolerance. The linear regulator uses an internal drive device to provide a fixed 2.5V ±2.5% output z Fixed Linear Regulator Output Voltage voltage. The linear controller drives an external N- z MOSFET or NPN Driving Capability channel MOSFET or a low cost NPN bipolar z Ultra Fast Response Speed transistor to provide a fixed 1.5V ±2.5%. z Under-voltage Protection z Internal Thermal Shutdown The RT9227A monitors all the output voltages. A Power-good signal is issued when the core voltage is Applications within ±10% of the DAC setting and the other levels z Full Motherboard Power Regulation for Computer are above their under-voltage levels. Additional build- z Low-voltage Distributed Power Supplies 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 RT9227A Package type S : SOP-24 Operating temperature range C: Commercial standard DS9227A-02 July 2001 Pin Configurations Part Number RT9227ACS (Plastic SOP-24) Pin Configurations TOP VIEW VCC VID4 VID3 1 24 2 23 3 UGATE1 PHASE1 22 LGATE1 VID2 4 21 VID1 VID0 PGOOD FAULT SS NC FB2 VIN2 5 20 6 19 7 18 8 NC FB3 15 GATE3 14 GND 13 VOT2 9 10 11 12 PGND OCSET1 VSEN1 FB1 17 16 www.richtek-ic.com.tw 1 RT9227A Preliminary Absolute Maximum Ratings z Supply Voltage +15V z PGOOD 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-24,θJA 75°C/W 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. Electrical Characteristics (VCC = 12V, PGND = 0V, TA = 25°C, unless otherwise specified) Parameter Symbol Test Conditions Min Typ Max Units UGATE1, GATE3, LGATE1, and VOUT2 Open -- 10 -- mA VCC Supply Current Nominal Supply Current ICC Power-On Reset VCC Rising Threshold VOCSET1 = 4.5V 7.5 -- 9.5 V VCC Falling Threshold VOCSET1 = 4.5V 7 -- 9 V Rising VIN2 Under-Voltage Threshold -- -- 2.8 V VIN2 Under-Voltage Hysteresis -- 0.5 -- V Rising VOCSET1 Threshold -- 1.25 -- V 180 200 225 KHz -- 1.9 -- VP-P DAC (VID0 – VID4) Input Low Voltage -- -- 0.8 V DAC (VID0 – VID4) Input High Voltage 2.0 -- -- V Oscillator Free Running Frequency Ramp Amplitude ∆VOSC Reference and DAC DACOUT Voltage Accuracy DACOUT = 2.05 ~ 3.50V -1 -- 1 % DACOUT Voltage Accuracy DACOUT = 1.30 ~ 2.00V -1% -- 20mV -- To be continued www.richtek-ic.com.tw 2 DS9227A-02 July 2001 RT9227A Preliminary Parameter Symbol Test Conditions Min Typ Max Units 2.437 2.500 2.563 V -- 1.875 2.175 V -- 100 -- mV 180 230 -- mA -- 700 -- mA 1.462 1.500 1.538 V -- 1.125 1.305 V -- 100 -- mV -- 65 -- dB -- 3 7 Ω -- 3 7 Ω -- 1 -- A -- 2 6 Ω Linear Regulator Regulation Voltage VREG Under-Voltage Level 10mA < IVOUT2 < 150mA FB2 Rising Under-Voltage Hysteresis Over-Current Protection Over-Current Protection During Start-Up Linear Controller Regulation Voltage VREG Under-Voltage Level VSEN3 = GATE3 0 < IGATE3 < 20mA FB3 Rising Under-Voltage Hysteresis PWM Controller Error Amplifier DC Gain PWM Controller Gate Driver VCC = 12V VCC - VUGATE1 = 1V UGATE Source RUGATE1 UGATE Sink RUGATE1 VUGATE1 = 1V LGATE Source ILGATE1 LGATE Sink RLGATE1 VLGATE1 = 1V VCC = 12V, VLGATE1 = 2V Protection VOUT1 Over-Voltage Trip VSEN1 Rising 112 115 120 % FAULT Souring Current VFAULT = 8V 10 14 -- mA 170 200 230 µA -- 11 -- µA OCSET1 Current Source IOCSET VOCSET1 = 4.5V Soft-Start Current ISS VSS = 1V Power Good VOUT1 Upper Threshold VSEN1 Rising 108 -- 112 % VOUT1 Under Voltage VSEN1 Rising 89 -- 95 % VOUT1 Hysteresis (VSEN1 / DACOUT) Upper/Lower Threshold -- 2 -- % -- -- 0.5 V PGOOD Voltage Low DS9227A-02 July 2001 VPGOOD IPGOOD = -4mA www.richtek-ic.com.tw 3 RT9227A Preliminary Function Block Diagram VSEN1 VCC OCSET1 200µA + 3.3V + + 90% _ + + LINEAR UNDER VOLTAGE 115% UGATE1 + VOUT2 _ 1.26V _ PGOOD VCC + LUV FB2 _ OC2 + SOFT-START & FAULT LOGIC _ 0.25A UPPER DRIVE 0V OC1 + VIN2 110% 0.3V 3.3V _ _ GATE3 POWER-ON RESET (POR) _ VSEN3 _ FAULT 5V _ TTL D/A CONVERTER (DAC) ERROR AMP _ DACOUT 11µA + + VCC INHIBIT GATE CONTROL PWM LOGIC PWM COMP OSCILLATOR PHASE1 VCC LGATE1 LOWER DRIVE PGND GND COMPENSATION SS VID0 VID2 VID4 VID1 VID3 FB1 Functional Pin Description VCC (Pin 1) 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. VID0, VID1, VID2, VID3, VID4 (Pin 6, 5, 4, 3, and 2) VIDO-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. It also sets the core PGOOD and OVP thresholds. Table 1 specifies the DACOUT voltage of 32 combinations of VID levels. PGOOD (Pin 7) PGOOD is an open collector output used to indicate the status of the output voltage. This pin is pulled low www.richtek-ic.com.tw 4 when the core output is not within ±10% of the DACOUT reference voltage and the other outputs are below their under-voltage thresholds. The PGOOD output is open for ‘11111’ VID codes that inhibit operation. See table 1. FAULT (Pin 8) 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. SS (Pin 9) Connect a capacitor from this pin to ground. This capacitor, along with an internal 11µA (VSS >1V) current source, sets the soft-start interval of the converter. DS9227A-02 July 2001 RT9227A Preliminary FB2 (Pin 11) Connect this pin to VOUT2 to set the linear regulator converter over-current (OC) trip point according to output voltage. the following equation: VIN2 (Pin 12) IPEAK = This pin supplies power to the internal regulator. IOCSET1×ROCSET1 RDS(ON) Connect this pin to a suitable 3.3V source. PGND (Pin 21) Additionally, this pin is used to monitor the 3.3V This is the power ground of UGATE1 and LGATE1. supply. If, following a startup cycle, the voltage drops Tie the PWM converter’s lower MOSFET source to below 2.55V (typically), the chip shuts down. A new this pin. soft-start cycle is initiated upon return of the 3.3V supply above the under-voltage threshold. LGATE1 (Pin 22) Connect LGATE1 to the PWM converter’s lower VOUT2 (Pin 13) MOSFET gate. This pin provides the gate drive for Output of the linear regulator. Supplies current up to the lower MOSFET. 230mA. GND (Pin 14) Signal ground for the IC. All voltage levels are measured with respect to this pin. GATE3 (Pin 15) Connect this pin to the gate of an external MOSFET or the base of an NPN. This pin provides the drive for the linear controller’s pass transistor. FB3 (Pin 16) Connect this pin to VOUT3 to set the linear controller output voltage. An over-current trip cycles the soft-start function. Sustaining an over-current for 2 soft-start intervals shuts down the controller. PHASE1 (Pin 23) Connect the PHASE1 pin to the PWM converter’s upper MOSFET source. This pin is used to monitor the voltage drop across the upper MOSFET for overcurrent protection. UGATE1 (Pin 24) Connect UGATE pin to the PWM converter’s upper MOSFET gate. This pin provides the gate drive for the upper MOSFET. FB (Pin 18) The FB1 pin is the inverting input of the error amplifier. VSEN1 (Pin 19) This pin is connected to the PWM converter’s output voltage. The PGOOD and OVP comparator circuits use this signal to report output voltage status and for over voltage protection. OCSET1 (Pin 20) Connect a resistor (ROCSET1) from this pin to the drain of the upper MOSFET. ROCSET1, an internal 200µA current source (IOCSET1), and the upper MOSFET on-resistance (RDS(ON)) set the PWM DS9227A-02 July 2001 www.richtek-ic.com.tw 5 RT9227A Preliminary Table 1. VOUT1 Voltage Program Pin Name VID4 VID3 VID2 VID1 VID0 Normal OUT1 Voltage DACOUT 0 1 1 1 1 1.30 0 1 1 1 0 1.35 0 1 1 0 1 1.40 0 1 1 0 0 1.45 0 1 0 1 1 1.50 0 1 0 1 0 1.55 0 1 0 0 1 1.60 0 1 0 0 0 1.65 0 0 1 1 1 1.70 0 0 1 1 0 1.75 0 0 1 0 1 1.80 0 0 1 0 0 1.85 0 0 0 1 1 1.90 0 0 0 1 0 1.95 0 0 0 0 1 2.00 0 0 0 0 0 2.05 1 1 1 1 1 INHIBIT 1 1 1 1 0 2.10 1 1 1 0 1 2.20 1 1 1 0 0 2.30 1 1 0 1 1 2.40 1 1 0 1 0 2.50 1 1 0 0 1 2.60 1 1 0 0 0 2.70 1 0 1 1 1 2.80 1 0 1 1 0 2.90 1 0 1 0 1 3.00 1 0 1 0 0 3.10 1 0 0 1 1 3.30 1 0 0 1 0 3.30 1 0 0 0 1 3.40 1 0 0 0 0 3.50 www.richtek-ic.com.tw 6 DS9227A-02 July 2001 RT9227A Preliminary Typical Application Circuit 12V 5V L1 F1 1µH 15A C1-4 4x1000µF GND + R1 10 C5-6 2x1µF C7 C20 1µF 1000pF 1 R2 VCC 20 OCSET1 1.21k 12 3.3V + C8 1000µF Q3 RFD3055 V OUT3 1.5V 15 16 + C9 1000µF V OUT2 2.5V VIN2 PGOOD GATE3 FB3 UGATE1 PHASE1 RT9227A 13 11 VOUT2 LGATE1 PGND FB2 + C10 270µF VSEN1 6 VID0 5 VID1 4 VID2 3 VID3 2 VID4 FB1 FAULT GND 14 DS9227A-02 July 2001 SS POWERGOOD 7 24 23 22 21 Q1 PHB83N03LT R3 10K L2 PHB95N03LT 3.5µH C13-19 Q2 7x1000µF R4 4.99K + V OUT1 1.3 to 3.5V 19 C11 18 R5 0.68µF 732K 8 9 C12 0.039µF www.richtek-ic.com.tw 7 RT9227A Preliminary Package Information H M B B J A C F Symbol www.richtek-ic.com.tw 8 D I Dimensions In Millimeters Dimensions In Inches Min Max Min Max A 15.189 15.596 0.598 0.614 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 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 DS9227A-02 July 2001 Preliminary DS9227A-02 July 2001 RT9227A www.richtek-ic.com.tw 9 RT9227A Preliminary RICHTEK TECHNOLOGY CORP. RICHTEK TECHNOLOGY CORP. Headquarter Taipei Office (Marketing) 6F, No. 35, Hsintai Road, Chupei City 8F-1, No. 137, Lane 235, Paochiao Road, Hsintien City Hsinchu, Taiwan, R.O.C. Taipei County, Taiwan, R.O.C. Tel: (8863)5510047 Fax: (8863)5537749 Tel: (8862)89191466 Fax: (8862)89191465 Email: [email protected] www.richtek-ic.com.tw 10 DS9227A-02 July 2001